pcbchaobanzh-cnGoodspeed Rss10Sat, 06 Sep 2008 07:29:33 GMTPCB设计技术：基于FPGA的PCB测试机硬件电路设计Sat, 28 Jun 2008 16:57:56 GMThttp://blog.cechinamag.com/pcbchaoban/107366/message.aspx<div class="Section0" style="LAYOUT-GRID: 15.6pt none"> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">设计技术：</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">基于FPGA的PC</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">B</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">测试机硬件电路设计</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">文章整理：</font></span><span><a href="http://www.pcblab.net/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">深圳龙芯世纪</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PCB<font face="宋体">光板测试机基本的测试原理是欧姆定律，其测试方法是将待测试点间加一定的测试电压，用译码电路选中</font></span><span><a href="http://pcbchaoban.5d6d.com/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">上待测试的两点，获得两点间电阻值对应的电压信号，通过电压比较电路，测试出两点间的电阻或通断情况。&nbsp;重复以上步骤多次，即可实现对整个电路板的测试。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span><a href="http://pcbljy.xinwen520.net/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">FPGA</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">电路设计</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">电路板设计&nbsp;</font></span><span><a href="http://pcblab.xinwen520.net/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">由于被测试的点数比较多，&nbsp;一般测试机都在2048点以上，测试控制电路比较复杂，测试点的查找方法以及切换方法直接影响测试机的测试速度，</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">研究了基于</font></span><span><a href="http://pcbcblab.blog.dianyuan.com/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">FPGA</span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">的硬件控制系统设计</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">，本文就为您介绍。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="VERTICAL-ALIGN: baseline; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">深圳龙芯世纪科技有限公司拥有PCB抄板工作室、PCB设计工作室、芯片解密工作室和SMT加工厂，龙芯世纪从事PCB行业多年，拥有丰富抄板和PCB设计经验。专业提供PCB</font></span><span><a href="http://blog.sina.com.cn/pcbcblab"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">/<font face="宋体">改板、PCB设计/Layout、</font></span><span><a href="http://www.pcblab.net/PCB/IC"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">芯片解密</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">/IC<font face="宋体">解密和SMT贴片加工/样机制作服务。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">硬件控制系统</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">测试过程是在上位计算机的控制下，控制测试电路分别打开不同的测试开关。测试机系统由以下几部分构成:&nbsp;上位计算机PC104&nbsp;、测试控制逻辑(由FPGA&nbsp;实现)&nbsp;、高压测试电路。&nbsp;其中上位机主要完成人机交互、测试算法、测试数据处理以及控制输出等功能。&nbsp;FPGA&nbsp;控制高压测试电路完成对PCB&nbsp;的测试过程。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">本系统以一台PC104&nbsp;为上位计算机，以FPGA为核心，通过PC104&nbsp;总线实现上位机对测试的控制。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">由于篇幅原因，本文只是做一个简要概括，更多关于</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">基于FPGA的PC</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">B</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">测试机硬件</font></span><span><a href="http://blog.tom.com/pcbcblab"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">电路设计</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">的内容请登录深圳龙芯世纪科技有限公司网站：</font></span><span><a href="http://www.pcblab.net/PCB/index.html"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net/PCB/index.html</span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">同时提供关于抄板、电路板抄板、电路板设计和芯片解密方面的技术文章。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p></div><!--EndFragment-->http://blog.cechinamag.com/pcbchaoban/107366/message.aspxPCB设计方法一、印刷电路板抄板 其他技术优化PCB设计的方案——PCB抄板和电路板设计Sat, 28 Jun 2008 16:57:23 GMThttp://blog.cechinamag.com/pcbchaoban/107365/message.aspx<div class="Section0" style="LAYOUT-GRID: 15.6pt none"> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">优化PCB设计的方案</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">——PCB<font face="宋体">抄板和电路板设计</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">文章整理：</font></span><span><a href="http://www.pcblab.net/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">深圳龙芯世纪</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">设计中，</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">电源管理被简单定义为：对</font></span><span><a href="http://pcbchaoban.5d6d.com/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB</span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">上的全部电源实施管理(包括：DC-DC转换器、LDO等)。电源管理包括如下功能：</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">管理PCB上DC-DC控制器。例如，热插拔、软启动、排序、追踪、容限和规整；</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">生成全部相关的电源状态和控制逻辑信号。例如，复位信号生成、电源故障指示(监控)和电压管理</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">热插拔/软启控制功能用于限制浪涌电流以减小电源的启动负载。对插入有源(live)基板的PCB来说，这是个重要功能；电源排序和跟踪功能用于在满足PCB上的全部器件对上电顺序要求的前提下，控制如何开/关多个电源。对所有电压进行故障(过/欠压)监测以向处理器就即将发生的电源故障进行预警。该功能也被称为“监管功能”。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">在处理器上电时，复位生成功能为处理器提供可靠的启动条件。有些处理器要求在处理器全部工作电源都稳定后，复位信号仍保留一段时间。这也被称为复位脉冲展延。复位发生器的功能是当电源发生故障时，使处理器保持在复位模式以防止板上闪存发生不希望的错误。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span><a href="http://pcblab.xinwen520.net/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">电源管理</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">一般来说是关于给PCB供电所涉及到的方方面面的。一些通常涉及的问题有：</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">1.&nbsp;<font face="宋体">选择各种DC-DC&nbsp;转换器为PCB供电；</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">2.&nbsp;<font face="宋体">电源启闭排序/跟踪；</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">3.&nbsp;<font face="宋体">电压监测；</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">4.&nbsp;<font face="宋体">上述全部。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB&nbsp;</span><span><a href="http://www.pcblab.net/PCB/index.html"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">电源管理&nbsp;PCB抄板&nbsp;</font></span><span><a href="http://www.pcblab.net/PCB/IC"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">芯片解密</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">传统电源管理方案的局限性</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">传统上，PCB上的每一电源管理功能是分别由单独的功能IC实现的。对不同的电压组合，这些IC有不同型号。这样，就有来自不同厂家的数百个单一功能IC型号以满足不同的电源管理需要。例如，为选择一款复位发生器IC型号，必须提供以下信息：</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">1.&nbsp;<font face="宋体">该复位发生器IC需监测的电压路数；</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">2.&nbsp;<font face="宋体">电压的组合(3.3、2.5、1.2或&nbsp;3.3、2.5、1.8等)；</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">3.&nbsp;<font face="宋体">故障检测电压的%(3.3V-5%、3.3V-10%等)；</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">4.&nbsp;<font face="宋体">精度(3%、2%、1.5%等)；</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">5.&nbsp;<font face="宋体">借助外接电容控制的复位脉冲展延功能；</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">6.&nbsp;<font face="宋体">手动复位输入。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">为处理这些参数所有可能的变化，单就一个复位发生器IC来说，仅一家厂商就可有几百个型号。另外，若在</font></span><span><a href="http://pcbcblab.zhan.cn.yahoo.com/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">电路板</font></span><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">设计</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">过程中，工程师需监测另一个电压(很可能)，则必须选另一个不同型号的产品。类似，许多单一功能IC即使仅就同一个功能、根据不同参数也会有许多型号，如热插拔控制器、电源排序器和电压监测/检测器等功能IC。一个由多块PCB构成的系统的每块PCB都需要不同组的这些单功能IC，从而也增加的材料成本。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: 'Arial'; mso-spacerun: 'yes'">深圳</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪科技有限公司</font></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: 'Arial'; mso-spacerun: 'yes'">是一家专业PCB设计、</span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB&nbsp;Layout<font face="宋体">、抄板、</font></span><span><a href="http://pcb.xinwen520.net/"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Arial'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB抄板</span></a></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: 'Arial'; mso-spacerun: 'yes'">、印刷电路板抄板及IC芯片解密的抄板公司，能根据客户的需求,提供无论单、双面、多层板、高频板等的PCB抄板、改板、PCB设计、PCB原理图设计、BOM清单、样机调试及制作业务。</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">详</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">情见：</font></span><span><a href="http://www.pcblab.net/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net</span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p></div><!--EndFragment-->http://blog.cechinamag.com/pcbchaoban/107365/message.aspxPCB设计方法一、印刷电路板抄板 嵌入式系统SMT名词及SMT加工技术解释——龙芯世纪SMT贴片加工厂Fri, 15 Feb 2008 09:44:57 GMThttp://blog.cechinamag.com/pcbchaoban/66916/message.aspx&nbsp; <div class="Section0"> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">SMT<font face="宋体">名词及SMT</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">加工</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">技术解释</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">——</span><span><a href="http://www.pcblab.net/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">SMT<font face="宋体">贴片加工厂</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪服务范围：</font></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪PCB抄板工作室提供PCB抄板、PCB改板、电路板抄板和线路板抄板服务</font></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.pcblab.net/PCB/ChaoBan"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板/改板技术</font></span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">：</font></span><span><a href="http://www.pcblab.net/PCB/ChaoBan"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net/PCB/ChaoBan</span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪PCB设计工作室提供PCB设计、PCB&nbsp;Layout、电路板设计、线路板设计服务</font></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.pcblab.net/PCB/SheJi"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计/Layout技术</font></span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">：</font></span><span><a href="http://www.pcblab.net/PCB/SheJi"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net/PCB/SheJi</span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: left"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪芯片解密工作室提供芯片解密、IC解密、单片机解密及MCU解密服务</font></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.pcblab.net/PCB/IC"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">芯片解密/IC解密技术</font></span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">：</font></span><span><a href="http://www.pcblab.net/PCB/IC"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net/PCB/IC</span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪SMT加工厂提供SMT加工、SMT贴片、SMT贴片加工、样机调试和样机制作</font></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.smtodm.com/"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">SMT<font face="宋体">加工/样机制作技术</font></span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">：</font></span><span><a href="http://www.smtodm.com/"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.smtodm.com</span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">表面贴装技术(Surfacd&nbsp;Mounting&nbsp;Technolegy简称SMT)是新一代电子组装技术,它将传统的电子元器件压缩成为体积只有几十分之一的器件,从而实现了电子产品组装的高密度、高可靠、小型化、低成本，&nbsp;以及生产的自动化。这种小型化的元器件称为：SMY器件（或称SMC、片式器件）。将元件装配到印刷（或其它基板）上的工艺方法称为SMT工艺。相关的组装设备则称为SMT设备。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">目前，先进的电子产品，特别是在计算机及通讯类电子产品，已普遍采用SMT技术。国际上SMD器&nbsp;件产量逐年上升，而传统器件产量逐年下降，因此随着进间的推移，SMT技术将越来越普及。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">或者说：&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">SMT<font face="宋体">就是表面组装技术（Surface&nbsp;Mounted&nbsp;Technology的缩写），是目前电子组装行业里最流行的一种技术和工艺。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">SMT<font face="宋体">加工&nbsp;SMT贴片&nbsp;SMT</font></span><span><a href="http://pcbcblab.zhan.cn.yahoo.com/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">贴片加工</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;SMT<font face="宋体">加工厂&nbsp;</font></span><span><a href="http://pcblab.xinwen520.net/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">SMT<font face="宋体">有何特点：&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">组装密度高、电子产品体积小、重量轻，贴片元件的体积和重量只有传统插装元件的1/10左右，一般采用SMT之后，电子产品体积缩小40%~60%，重量减轻60%~80%。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">可靠性高、抗振能力强。焊点缺陷率低。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">高频特性好。减少了电磁和射频干扰。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">易于实现自动化，提高生产效率。降低成本达30%~50%。&nbsp;节省材料、能源、设备、人力、时间等。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">为什么要用SMT：&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">电子产品追求小型化，以前使用的穿孔插件元件已无法缩小&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">电子产品功能更完整，所采用的集成电路(IC)已无穿孔元件，特别是大规模、高集成IC，不得不采用表面贴片元件&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">产品批量化，生产自动化，厂方要以低成本高产量，出产优质产品以迎合顾客需求及加强市场竞争力&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">电子元件的发展，集成电路(IC)的开发，半导体材料的多元应用&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">电子科技革命势在必行，追逐国际潮流&nbsp;。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">以上是龙芯世纪介绍的关于</font></span><span><a href="http://pcbcblab.blog.sohu.com/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、PCB抄板和</font></span><span><a href="http://hexun.com/pcbcblab"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">的技术知识，更多抄板、PCB抄板和PCB设计技术文章请进：</font></span><span><a href="http://www.pcblab.net/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net</span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p></div><!--EndFragment-->http://blog.cechinamag.com/pcbchaoban/66916/message.aspxPCB设计方法一、印刷电路板抄板 编辑博客PCB/PWB/FPC的定义和区别——抄板、PCB抄板和PCB设计技术Fri, 15 Feb 2008 09:44:28 GMThttp://blog.cechinamag.com/pcbchaoban/66915/message.aspx&nbsp; <div class="Section0"> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PCB/PWB/FPC<font face="宋体">的定义和区别</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">——<font face="宋体">抄板、PCB抄板和PCB设计技术</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">★</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">本文关键字</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">★</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">：</font></span><span><a href="http://blog.sina.com.cn/pcbcblab"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;PCB<font face="宋体">抄板&nbsp;PCB设计&nbsp;</font></span><span><a href="http://hi.baidu.com/pcbcblab"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">抄板公司</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">芯片解密&nbsp;SMT加工</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.pcblab.net/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">深圳龙芯世纪科技有限公司</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">拥有PCB抄板工作室、</font></span><span><a href="http://pcbcblab.sogua.com/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">工作室、芯片解密工作室和SMT加工厂，龙芯世纪从事PCB行业多年，拥有丰富抄板和PCB设计经验。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">详</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">情见：</font></span><span><a href="http://www.pcblab.net/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net</span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;</span><span><a href="http://pcbcblab.pcclub.pconline.com.cn/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB</span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">是英文Printed&nbsp;circuit&nbsp;board的缩写，正式译文是印制电路板或印制线路板，或印刷线路板；包括印制线路图形和印制元件；</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span><a href="http://pcbcblab.blog.dianyuan.com/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PWB</span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">是英文Printed&nbsp;wire&nbsp;board的缩写，正式译文是印刷线路板，是英国人早期的叫法，因为当时线路板上只有线路图，而没有印制元件等，所以属于较为原始的板子；由于传统好多英国人和部分香港人还称线路板为PWB；</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;</span><span><a href="http://pcbcblab.zhan.cn.yahoo.com/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">&nbsp;FPC</span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">是柔性线路板简称，又称软板，英文是Flexible&nbsp;printed&nbsp;board的缩写</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪服务范围：</font></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪PCB抄板工作室提供PCB抄板、PCB改板、电路板抄板和线路板抄板服务</font></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.pcblab.net/PCB/ChaoBan"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板/改板技术</font></span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">：</font></span><span><a href="http://www.pcblab.net/PCB/ChaoBan"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net/PCB/ChaoBan</span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪PCB设计工作室提供PCB设计、PCB&nbsp;Layout、电路板设计、线路板设计服务</font></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.pcblab.net/PCB/SheJi"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计/Layout技术</font></span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">：</font></span><span><a href="http://www.pcblab.net/PCB/SheJi"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net/PCB/SheJi</span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: left"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪芯片解密工作室提供芯片解密、IC解密、单片机解密及MCU解密服务</font></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.pcblab.net/PCB/IC"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">芯片解密/IC解密技术</font></span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">：</font></span><span><a href="http://www.pcblab.net/PCB/IC"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net/PCB/IC</span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪SMT加工厂提供SMT加工、SMT贴片、SMT贴片加工、样机调试和样机制作</font></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.smtodm.com/"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">SMT<font face="宋体">加工/样机制作技术</font></span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">：</font></span><span><a href="http://www.smtodm.com/"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.smtodm.com</span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p></div><!--EndFragment-->http://blog.cechinamag.com/pcbchaoban/66915/message.aspxPCB设计方法一、印刷电路板抄板 嵌入式系统PCB抄板和PCB设计中PCB板返修时PCB组件预热的三个方法Fri, 15 Feb 2008 09:43:53 GMThttp://blog.cechinamag.com/pcbchaoban/66914/message.aspx&nbsp; <div class="Section0"> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">抄板和PCB设计中PCB板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">返修</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">时</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PCB<font face="宋体">组件预热的三个方法</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">文章整理：</font></span><span><a href="http://www.pcblab.net/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">(pcbchaoban)</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">以下是龙芯世纪</font></span><span><a href="http://www.pcblab.net/PCB/index.html"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板公司</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">设计工作室凭着多年行业研究和实践经验总结的关于PCB抄板和</font></span><span><a href="http://pcblab.xinwen520.net/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">中PCB板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">返修</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">时</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PCB<font face="宋体">组件预热的三个方法</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　如今，预热PCB组件方法分为三类：烘箱、热板和热风槽。在</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">印刷电路板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">返修和进行再流焊拆卸元器件之前使用烘箱来预热基板，是行之有效的。而且，预热烘箱在烘烤掉某些集成电路中内部湿气和防止爆米花现象上，采用烘烤是一个有利方法。所谓爆米花现象是指返修的SMD器件在湿度上高于正常器件的湿度在突然受到快速升温时会发生的微崩裂。PCB</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">电路板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">在预热烘箱中的烘烤时间较长,&nbsp;一般长达8小时左右。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://pcbvoip.xinwen520.net/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;PCB<font face="宋体">抄板&nbsp;PCB设计</font></span><span><a href="http://blog.sina.com.cn/pcbcblab"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">&nbsp;<font face="宋体">印刷电路板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;PCB<font face="宋体">板&nbsp;芯片解密</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　预热烘箱的一个缺陷是不同于热板和热风槽，预热时由一个</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">技术员进行预热和兼同时返修是行不通的。而且，对烘箱来讲做到迅速冷却焊点是不可能的。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　热板是预热PCB板最无效的办法。因为要维修的PCB组件不全是单面的,&nbsp;当今是混合技术的世界，一面全部是平整或平面的PCB组件的确是少见的。PCB在基板两边一般都要安装元器件。这些不平整的表面采用热板预热是不可能的。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　</font></span><span><a href="http://hi.baidu.com/pcbcblab"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">和PCB设计中</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">热板的第二个缺陷是一旦实现焊料再流，热板仍会持续对PCB组件释放热量。这是因为，即使拔掉电源之后，热板内仍会有储存的残余热量继续传导给</font></span><span><a href="http://pcbcblab.blog.dianyuan.com/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">P</span><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">CB</span><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">阻碍了焊点的冷却速度。这种阻碍焊点冷却会引起不必要的铅的析出形成铅液池，使焊点强度降低和变差。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">抄板和PCB设计中</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">采用热风槽预热的优点是:&nbsp;热风槽完全不考虑PCB组件的外形（和底部结构），热风能直接迅速地进入PCB组件的所有角落和裂缝中。使整个PCB组件加热均匀,&nbsp;且缩短了加热时间。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="VERTICAL-ALIGN: baseline; LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">深圳龙芯世纪科技有限公司拥有PCB抄板工作室、</font></span><span><a href="http://pcbcblab.zhan.cn.yahoo.com/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计工作室</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、芯片解密工作室和SMT加工厂，龙芯世纪从事PCB行业多年，拥有丰富抄板和PCB设计经验。专业提供</font></span><span><a href="http://pcbcblab.sogua.com/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板/改板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、PCB设计/Layout、芯片解密/IC解密和SMT贴片加工/样机制作服务。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">详</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">情见：</font></span><span><a href="http://www.pcblab.net/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net</span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="VERTICAL-ALIGN: baseline; LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">电话&nbsp;(TEL):</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">0755-83511993,83676200</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">魏小姐</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="VERTICAL-ALIGN: baseline; LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0755-</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">21199019</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">,</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">21193600</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">余小姐</font></span><span style="FONT-WEIGHT: bold; FONT-SIZE: 10.5pt; FONT-FAMILY: 'Arial'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">邮箱(E-mail)：PCBLab@126.com</font></span><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">联系地址：</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">深圳市福田区福虹路世界贸易广场荟景豪庭12F</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;<font face="宋体">邮编：518033</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p></div><!--EndFragment-->http://blog.cechinamag.com/pcbchaoban/66914/message.aspxPCB设计方法一、印刷电路板抄板 其他技术PCB设计、抄板和PCB抄板新技术：密间距BGASat, 02 Feb 2008 14:35:24 GMThttp://blog.cechinamag.com/pcbchaoban/66567/message.aspx&nbsp; <div class="Section0"> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">设计、抄板和PCB抄板新技术：</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">密间距BGA</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">文章整理：</font></span><span><a href="http://www.pcblab.net/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">(pcbchaoban)</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">以下是龙芯世纪</font></span><span><a href="http://www.pcblab.net/PCB/index.html"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板公司</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">设计工作室凭着多年行业研究和实践经验总结的关于</font></span><span><a href="http://pcblabjy.blog.163.com/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、PCB抄板、</font></span><span><a href="http://pcblab.blog.ccidnet.com/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">芯片解密</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">和单片机解密方面的技术知识：</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">密间距BGA</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　联合电子元件工程委员会(JEDEC,&nbsp;Joint&nbsp;Electronic&nbsp;Device&nbsp;Engineering&nbsp;Council)&nbsp;的BGA指引手册提出了许多物理特性和提供对包装供应商的形式上的灵活性。JEDEC&nbsp;JC-11批准的第一份有关密间距BGA的文件是以注册外形&nbsp;MO-195&nbsp;(the&nbsp;Registered&nbsp;Outline&nbsp;MO-195)，基本的0.50mm间距触点排列的统一方形包装类。包装尺寸范围为4.0~21&nbsp;mm，从贴装表面的总高度限定在1.20&nbsp;mm。下表是考虑中的其它的变量。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: left"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">设计&nbsp;</font></span><span><a href="http://pcbcblab.blog.sohu.com/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">抄板&nbsp;PCB抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">芯片解密&nbsp;IC解密&nbsp;抄板公司&nbsp;</font></span><span><a href="http://pcbcblab.co.bokee.net/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">密间距BGA</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">CSP<font face="宋体">标准的变量</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">排列间距0.40,&nbsp;0.50,&nbsp;0.65,&nbsp;0.75,&nbsp;0.80&nbsp;mm</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">触点直径0.20,&nbsp;0.25,&nbsp;0.30,&nbsp;0.40,&nbsp;0.50&nbsp;mm</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">轮廓(高度)变量</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">(L)<font face="宋体">低轮廓</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">最大&nbsp;1.70&nbsp;mm</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">(T)<font face="宋体">薄轮廓</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">最大&nbsp;1.20&nbsp;mm</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">(V)<font face="宋体">非常薄的轮廓</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">最大&nbsp;1.00&nbsp;mm</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">(W)<font face="宋体">非常非常薄的轮廓</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">最大&nbsp;0.80&nbsp;mm</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">(U)<font face="宋体">超薄轮廓</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">最大&nbsp;0.65&nbsp;mm&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">密间距BGA触点排列计划</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">——<font face="宋体">抄板、</font></span><span><a href="http://pcbcblab.blog.bokee.net/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">和PCB设计技术</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　球的间距和尺寸将影响电路的走线效率。许多公司已经决定对较低I/O&nbsp;的CSP应用不采用0.5&nbsp;mm的间距。选择一种较松散的触点，较粗的球间距可舒缓最终用户采用更复杂PCB技术的需要。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　0.50&nbsp;mm的排列触点间距是JEDEC推荐的最小的。触点直径规定为0.30&nbsp;mm，允许误差范围为0.25~0.25&nbsp;mm。可是，大多数采用0.50mm间距的BGA应用将决定于次表面电路的走线。在0.25mm焊盘之间的空间只够单个0.08mm宽线路的连线。将大量的电源和地线的触点分布在排列和局部，或空隙的的周围，去掉触点(depopulation)将提供排列矩阵的有限的贯穿。这些较高的I/O应用将依靠多层、盲通路孔、或封闭电镀焊盘内通路孔(via-on-pad)技术。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　元件性能可能如包装尺寸一样相差很大。用于高密度、高I/O应用的包装技术必须首先满足周围的条件。那些使用由陶瓷或有机分层制成的刚性插入式结构的元件不能密切地配合硅芯片的外形。元件周围的引脚绑定座之间的连接必须向内流向。&nbsp;μ&nbsp;BGA&nbsp;?&nbsp;包装结构的一个实际优点是它能够提供硅芯片外形内的所有电气连接介面。一些μBGA使用高级聚酰亚胺胶片(polyimide&nbsp;film)作其基底结构，半添加铜电镀工艺来完成芯片上铝绑定座与聚酰亚胺插入片上球接触座之间的连接，详情见图一。不是使用普通的线绑定工艺来把芯片连接到插入片，布置在柔性插入片的镀金的铜引脚重新定形和直接绑定在芯片上。这种相顺从的材料的独特结合使元件可以经受非常苛刻的环境。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　这种包装已经被几个制造商采用。定义为面朝下的(face-down)</font></span><span><a href="http://cblog.chinadaily.com.cn/port/pcbchaoban"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">CSP</span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">，这种元件通常不比电路芯片大。芯片上的铝绑定焊盘是向着球接触点和PCB表面定位的。这种结构在业内被广泛所接受，因为材料于引脚设计的专利系统物理上相适应，补偿了硅芯片和PCB的温度膨胀系数的差别。采用顺从材料的另一个方法是将硅芯片面朝上装配。面朝上(face-up)的芯片包装为芯片附着采用了与面朝下包装一样的弹性体材料。两种概念的主要不同是在芯片与柔性胶片插入片之间的引脚端点。μBGA为电气连接采用传统的金线绑定技术。虽然由几个早期的专利保护，它的应用已经成为主流。公司要求比密间距BGA更大的包装(图二)的理由是更多的。在某些情况，通常预计新的硅产品的芯片收缩以变得比希望的和其它应用更加过分，制造商可能宁愿采用加大的接触点间距的列阵方案，以方便电路走线。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="VERTICAL-ALIGN: baseline; LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">深圳龙芯世纪科技有限公司拥有PCB抄板工作室、</font></span><span><a href="http://pcbcblab.blogbus.com/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计工作室</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、芯片解密工作室和SMT加工厂，龙芯世纪从事PCB行业多年，拥有丰富抄板和PCB设计经验。专业提供PCB抄板/改板、</font></span><span><a href="http://pcbchaoban.co.bokee.net/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计/Layout</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、芯片解密/IC解密和</font></span><span><a href="http://pcbcblab.pcclub.pconline.com.cn/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">SMT<font face="宋体">贴片加工/样机制作</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">服务。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">详</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">情见：</font></span><span><a href="http://www.pcblab.net/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net</span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="VERTICAL-ALIGN: baseline; LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">电话&nbsp;(TEL):</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">0755-83511993,83676200</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">魏小姐</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="VERTICAL-ALIGN: baseline; LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0755-</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">21199019</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">,</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">21193600</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">余小姐</font></span><span style="FONT-WEIGHT: bold; FONT-SIZE: 10.5pt; FONT-FAMILY: 'Arial'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">邮箱(E-mail)：PCBLab@126.com</font></span><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">联系地址：</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">深圳市福田区福虹路世界贸易广场荟景豪庭12F</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;<font face="宋体">邮编：518033</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p></div><!--EndFragment-->http://blog.cechinamag.com/pcbchaoban/66567/message.aspxPCB设计方法一、印刷电路板抄板 PLC/PACPCB设计及芯片解密、单片机解密相关：主流软件加密锁的不足Sat, 02 Feb 2008 14:27:53 GMThttp://blog.cechinamag.com/pcbchaoban/66563/message.aspx&nbsp; <div class="Section0"> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">设计及芯片解密、单片机解密相关：</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">主流软件加密锁的不足</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">以下是</font></span><span><a href="http://www.pcblab.net/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">为你介绍的关于</font></span><span><a href="http://pcblabjy.blog.163.com/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、PCB抄板、</font></span><span><a href="http://pcblab.blog.ccidnet.com/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">芯片解密</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">和单片机解密方面的技术文章：</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">主流软件加密锁的不足</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　对软件加密保护产品而言，使用者最关心的是加密的有效性，产品的兼容性和稳定性。目前市场上主要的</font></span><span><a href="http://pcbchaoban.blog.hexun.com/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">软件加密锁</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">硬件内部均含有单片机，即所谓内置CPU，软件厂商主要是利用算法功能进行加密。加密锁通常还增加了一些辅助功能，比如倒计数器、远程升级等。这类型加密锁主要产品有彩虹天地的“微狗”“SuperPro”、深思洛克的“深思Ⅰ、III型”、&nbsp;ALADDIN的HASP3、4等。通过对这些软件锁进行分析，认为从安全性上讲他们至少有三方面致命的薄弱点：&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">设计&nbsp;芯片解密&nbsp;单片机解密&nbsp;</font></span><span><a href="http://pcbchaoban.co.bokee.net/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">抄板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　薄弱点1：设计原理有很大缺陷&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　目前主流的加密锁硬件提供了读、写和算法变换功能，且算法变换关系难以pj和穷举。但这类加密锁最大的缺陷是算法不向软件厂商公开，锁内的变换算法在出厂时已经固定，软件加密者只能设置算法的参数。这样就限制了厂商对算法的使用，要么预先记录算法结果然后在软件运行时核对（使用码表），要么在软件中至少变换两次然后比较结果是否一致；如果解密者截获这些数据，通过统计、分析就有可达到解密目的。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪PCB设计工作室提供PCB设计、</font></span><span><a href="http://pcbchaoban.5d6d.com/"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB&nbsp;Layout</span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、电路板设计、线路板设计服务</font></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　薄弱点2：加密锁受处理能力的限制，无法为软件提供强有力的保护&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　市场上曾先后推出了几款“可编程”加密锁。这类型加密锁最大的特点就是可以让用户自行设计专用算法。“可编程”加密锁的出现的确是软件加密技术的一次进步。深思洛克的“深思III”、飞天诚信的“Rockey4”均属此类产品。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪PCB抄板工作室提供</font></span><span><a href="http://pcbchaoban.blog.china.com.cn/"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">抄板</font></span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、PCB抄板、PCB改板、电路板抄板和线路板抄板服务</font></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　薄弱点3：硬件本身抵抗恶意攻击的能力较弱&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　随着集成电路设计、生产技术的发展，安全产品的核心芯片硬件本身受到攻击的可能性越来越大。典型的硬件攻击手段有电子探测攻击（如SPA和DPA）和物理攻击（探测，如采用SiShell技术），下面我们就这方面进行简要的分析。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪SMT加工厂提供</font></span><span><a href="http://www.pcblab.net/SMT/index.html"><span class="16" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">SMT<font face="宋体">加工、SMT贴片</font></span></a></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、SMT贴片加工、样机调试和样机制作</font></span><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　电子探测（SPA和DPA）攻击技术的原理是：单片机芯片是一个活动的电子元器件，当它执行不同的指令时，对应的电功率消耗也相应的变化。通过使用特殊的电子测量仪和数学统计技术，来检测和分析这些变化，从中得到单片机中的特定关键信息。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　物理攻击的方法有：通过扫描电子显微镜对芯片内部存储器或其它逻辑直接进行分析读取；通过测试探头读取存储器内容；通过从外部无法获取的接口（例如厂家测试点）对存储器或处理器进行直接数据存取；再激活单片机的测试功能等。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　由于通用低档单片机并非定位于制作安全类产品，没有提供有针对性的防范物理攻击手段，因此比较容易通过电子探测（SPA和DPA）攻击直接读出存储器内的数据。虽然大多数普通单片机都具有熔丝烧断保护单片机内代码的功能，但此类芯片应用场合广、发行批量大，随着厂商间委托加工与频繁技术转让，使得利用该类芯片下载程序的设计漏洞，利用厂商的芯片测试接口，通过特殊的烧写时序和数据读出信息成为比较容易的事情。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　ASIC芯片是完全根据用户需求而特别定做，属于小批量生产。由于其采用特殊的逻辑电路且不会轻易公开测试功能接口，因此只要以其为基础开发的系统不是保存重要的信息或者不用于高级别的安全场合还是可以防范一般情况下的物理攻击。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">更多关于PCB抄板、PCB设计、芯片解密、单片机解密和SMT加工等技术性文章请登陆：</font></span><span><a href="http://www.pcblab.net/"><span class="16" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net</span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p></div><!--EndFragment-->http://blog.cechinamag.com/pcbchaoban/66563/message.aspxPCB设计方法一、印刷电路板抄板 其他技术PCB抄板、PCB设计心得-在powerpcb中如何将多层板层数减少Mon, 07 Jan 2008 11:34:14 GMThttp://blog.cechinamag.com/pcbchaoban/62293/message.aspx&nbsp; <div class="Section0"> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">★</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">本文关键词</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">★</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">：</font></span><span><a href="http://pcbchaoban.web.17jzw.com/"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">,</span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PCB</span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">抄板,</font></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PCB</span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">设计,pcb&nbsp;Layout,</font></span><span><a href="http://www.bopin.net/u/pcbchaoban/index.html"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">芯片解密,IC解密</font></span></a></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">,<font face="宋体">抄板公司,深圳抄板,</font></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PCB</span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">改板,电路板抄板,</font></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">电路板设计,</font></span><span><a href="http://pcbchaoban.siteem.com/"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">印刷电路板</font></span></a></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">,</span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">bom<font face="宋体">清单</font></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">,<font face="宋体">样机调试,高速pcb设计,快速抄板,特价抄板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">在&nbsp;powerpcb&nbsp;中将多层板的层数减小的方法如下，现举个例子：4&nbsp;层板删除&nbsp;layer2、layer3&nbsp;层，变成&nbsp;2&nbsp;层板，其他的做法一样：&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">第一步：删除layer2层的电特性数据，包括走在该层的traces、copper、via。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">第二步：删除layer3层的电特性数据，包括走在该层的traces、copper、via。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">第三步：进入菜单setup/Layer&nbsp;Definition面板。在Electrical&nbsp;layers&nbsp;栏中点击modify按钮。在弹出的对话框中输入&nbsp;2。如果&nbsp;layer2、layer3&nbsp;已经没有电特性数据，那么&nbsp;4&nbsp;层就变成&nbsp;2&nbsp;层板了。如果&nbsp;layer2、layer3&nbsp;已经还有电特性数据，会出现一个警告说layer2、layer3已经还有电特性数据。按第一、第二步骤删除它，再进入第三步。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">第四步：将原先布在layer2、layer3的相关部分布到top、bottom层即可。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="MARGIN-TOP: 5pt; MARGIN-BOTTOM: 5pt; LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">powerpcb&nbsp;<font face="宋体">中可以自己定义快捷键吗?&nbsp;每次find的时候都要edit-&gt;find太麻烦了想改成很多PCB工具的ctrl+f&nbsp;谁有好办法？&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">打开PADSPWR根目录下的POWERPCB/MENUFILE.DAT(用记事本打开),再用记事本的查找功能找出"FIND"的语句,此语句的后面有"65"字样,在此后面加上"CTRL+F",将所有的找出来都加上"CTRL+F"后保存,重新启动POWERPCB,试一试"CTRL+F",加快捷键是不是成功呢!!爽不爽!&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">更多关于</font></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">抄板,</font></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PCB<font face="宋体">抄板,</font></span><span><a href="http://pcbchaoban.zhan.cn.yahoo.com/"><span class="15" style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span></a></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">,pcb&nbsp;Layout<font face="宋体">和</font></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">抄板软件</font></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">POWERPCB</span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(51,102,255); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">使用技巧的技术文章请进：</font></span><span><a href="http://www.pcblab.net/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net</span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p></div><!--EndFragment-->http://blog.cechinamag.com/pcbchaoban/62293/message.aspxPCB设计方法一、印刷电路板抄板 嵌入式系统元器件知识：行业精英策论PCB设计关键技术Mon, 07 Jan 2008 11:33:26 GMThttp://blog.cechinamag.com/pcbchaoban/62292/message.aspx&nbsp; <div class="Section0"> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">元器件知识：行业精英策论PCB设计关键技术</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">文章整理：</font></span><span><a href="http://pcbchaoban.xingkong.com/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">深圳龙芯世纪科技有限公司</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">(pcbchaoban)</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">基于Ansoft电磁技术的新一代PCB设计</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">SI</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">仿真&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;<font face="宋体">针对</font></span><span><a href="http://pcbchaoban.blog.zj.com/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">人员关注的问题予以讨论，剖析PCB电磁问题的实质及处理方法，介绍</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">SI</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">仿真解决方案的技术特点，与同类型产品的定位关系及比较，并为您展示Ansoft电磁技术及工具在国内外PCB设计中的成功应用案例。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">设计&nbsp;</font></span><span><a href="http://hexun.com/pcbchaoban"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;PCB<font face="宋体">板&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">EMC</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">设计&nbsp;SI</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">仿真&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;PCB/<font face="宋体">机箱系统电磁兼容设计关键技术&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;<font face="宋体">关注由于PCB电磁辐射引起的机箱系统电磁兼容设计，以具体应用实例介绍从PCB到机箱系统的整个EMC</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">设计</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">仿真技术。内容涵盖如何使用SIwave对PCB进行EMC仿真和改进，比较不同设计方案的EMI辐射特性；用三维场工具HFSS对机箱进行设计优化，提高其屏蔽特性；通过Ansoft独有的Datalink实现多块PCB和机箱的整体电磁兼容特性评估，让您明确如何采用Ansoft仿真技术实现工程EMC/EMI设计。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;Ansoft<font face="宋体">高性能SI/PI设计帮助改善PCB电磁兼容</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">(</span><span><a href="http://pcbchaoban.5d6d.com/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">EMC</span><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">设计</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">)</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">特性&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;<font face="宋体">关注PCB电源完整性和信号完整性对其电磁兼容特性的影响，从PCB开关噪声/电磁辐射产生的根源入手，根本解决电磁噪声问题。介绍国外的成功应用经验，用AnsoftSIwave工具对实际复杂PCB进行精确建模和仿真，重点介绍如何用SIwave来改善PI/SI特性，从而成功抑制PCB电磁噪声。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;<font face="宋体">数模混合电路电磁噪声抑制&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;<font face="宋体">数模混合电路中数字电路产生的电磁噪声，例如电源/地网络上的同步开关噪声，对敏感的模拟/射频电路会产生极大影响，降低电路灵敏度，甚至严重干扰模拟部分的正常工作。本专题向您介绍如何用独特Ansoft工具仿真精确建模，提取干扰参数，并预评估相应措施的有效性。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;<font face="宋体">复杂FPGA电路板供电系统设计&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;PCB<font face="宋体">的</font></span><span><a href="http://pcbchaoban.blog.china.com/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PI<font face="宋体">和SI仿真</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">是相互关联的，孤立处理SI和PI不能真正解决PCB问题，严重的同步开关噪声（SSN）不仅会导致强烈的电磁辐射，而且会使</font></span><span><a href="http://www2.qz123.com/?23985"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">本身工作状态不稳，出现误操作。本讲座介绍著名FPGA芯片供应商Xilinx公司采用SIwave+DesignerSI+Nexxim仿真复杂PCB板的同步开关噪声的过程，提出新的SSN仿真流程，并与实测结果进行了比较。&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;<font face="宋体">基于电磁场技术的PCB信号完整性设计&nbsp;</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;<font face="宋体">从实际应用出发，介绍如何用Ansoft工具对复杂信号通道进行精确建模，强调基于电磁场技术的精确建模的必要性和作用。让您了解如何在DesignerSI的平台上，实现“芯片-封装-走线-过孔-子电路板-连接器-主板-封装-芯片”完整通道的优化设计、整体特性评估，并输出眼图、误码率等关键指标。</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p> <p class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">更多关于</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">抄板</font></span><span><a href="http://pcbchaoban.pcclub.pconline.com.cn/"><span class="15" style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://pcbchaoban.pcclub.pconline.com.cn</span></