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<h2>新聞中心</h2> </div> <div id="27kcj3j" class="hLocation"> <p><a href="http://dyxdggzs.com" target="_blank">EEPW首頁(yè)</a> > <a href="/info/industry/special/eda">EDA/PCB</a> > <a href="/info/articlelist/special/eda/type/5">設計應用</a> > PCB設計：談?wù)勲娫赐暾苑抡娴谋匾?/p> </div> </div> </div>    <div class="ktqmi2o" id="container"> <section> <article> <h1>PCB設計：談?wù)勲娫赐暾苑抡娴谋匾?/h1> <div id="78xtmvp" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2018-07-26</span> <span>來(lái)源：網(wǎng)絡(luò )</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="qtq2m7k" class="nav0"> <ul> <li><a href="javascript:void(0);"><img src="http://dyxdggzs.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />加入技術(shù)交流群</a> <ul> <li style="text-align:center;"><img src="http://dyxdggzs.com/event/company/images/code_1.jpg" width="130"><br />掃碼加入<br />和技術(shù)大咖面對面交流<br />海量資料庫查詢(xún)</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="uxvo83k" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="8axplv8" class="content" id="contentDiv" style="position:relative;"> <div id="3ibwhb8" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><p>隨著(zhù)超大規模集成電路工藝的發(fā)展，芯片工作電壓越來(lái)越低，而工作速度越來(lái)越快，功耗越來(lái)越大，單板的密度也越來(lái)越高，因此對電源供應系統在整個(gè)工作頻帶內的穩定性提出了更高的要求。<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/電源完整性"><em>電源完整性</em></a>設計的水平直接影響著(zhù)系統的性能，如整機可靠性，信噪比與誤碼率，及EMI/EMC等重要指標。板級電源通道阻抗過(guò)高和同步開(kāi)關(guān)噪聲SSN過(guò)大會(huì )帶來(lái)嚴重的<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/電源完整性"><em>電源完整性</em></a>問(wèn)題，這些會(huì )給器件及系統工作穩定性帶來(lái)致命的影響。PI設計就是通過(guò)合理的平面電容、分立電容、平面分割應用確保板級電源通道阻抗滿(mǎn)足要求，確保板級電源質(zhì)量符合器件及產(chǎn)品要求，確保信號質(zhì)量及器件、產(chǎn)品穩定工作。</p>本文引用地址：<a href="http://dyxdggzs.com/article/201807/384136.htm">http://dyxdggzs.com/article/201807/384136.htm</a><p><a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/電源完整性"><em>電源完整性</em></a>PI與信號完整性SI的相互影響：從整個(gè)<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/仿真"><em>仿真</em></a>領(lǐng)域來(lái)看，剛開(kāi)始大家都把注意力放在信號完整性上，但是實(shí)際上電源完整性和信號完整性是相互影響相互制約的。電源、地平面在供電的同時(shí)也給信號線(xiàn)提供參考回路，直接決定回流路徑，從而影響信號的完整性;同樣信號完整性的不同處理方法也會(huì )給電源系統帶來(lái)不同的沖擊，進(jìn)而影響電源的完整性設計。所以對電源完整性和信號的完整性地融會(huì )貫通是很有益處的。設計工程師在掌握了信號完整性設計方法之后，充實(shí)電源完整性設計知識顯得很有必要。</p><p>電源完整性研究的內容：電源完整性<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/仿真"><em>仿真</em></a>的內容很多，但主要的幾個(gè)方面如下：</p><p>1：板級電源通道阻抗<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/仿真"><em>仿真</em></a>分析，在充分利用平面電容的基礎上，通過(guò)仿真分析確定旁路電容的數量、種類(lèi)、位置等，以確保板級電源通道阻抗滿(mǎn)足器件穩定工作要求。</p><p>2：板級直流壓降仿真分析，確保板級電源通道滿(mǎn)足器件的壓降限制要求。</p><p>3：板級諧振分析，避免板級諧振對電源質(zhì)量及EMI的致命影響等。</p><p align="center"><img src="http://uphotos.eepw.com.cn/fetch/20180719/384136_1_0.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p><p style="text-align: center;">圖1 電源分配系統特性圖</p><p>電源分配系統(PDS)：上圖是一張經(jīng)典的電源分配系統特性圖，相信大家都比較熟悉。從這個(gè)圖里面，我們可以將整個(gè)電源頻段分成幾部分。在低頻段，電源噪聲主要靠電源轉換芯片VRM來(lái)濾波。在幾MHZ到幾百MHZ的頻段，電源噪聲主要是由板級分立電容和PCB的電源地平面對來(lái)濾波。在高頻部分，電源噪聲主要是由PCB的電源地平面對和芯片內部的高頻電容來(lái)濾波。我們在做仿真的時(shí)候，對低頻和高頻部分的仿真精度都還不準確，真正有意義的頻段主要還是在幾MHZ到幾百MHZ這個(gè)頻段。</p><p>該聊聊大家都很熟悉的目標阻抗Ztarget了。筆者認為，這個(gè)目標阻抗是電源完整性仿真里的一個(gè)有用但不精確的標準。</p><p align="center"><img src="http://uphotos.eepw.com.cn/fetch/20180719/384136_1_1.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p><p>其中：Ztarget目標阻抗</p><p>Power Supply Voltage是工作電壓</p><p>Allowed Ripple 是允許的工作電壓紋波系數</p><p>Current 是工作電流，目前這個(gè)值是用最大電流的1/2來(lái)替代。</p><p>大家都知道，電源測試的時(shí)候，主要是測試紋波，噪聲，但是業(yè)界目前還很難通過(guò)軟件進(jìn)行時(shí)域的紋波噪聲仿真(一些大公司已經(jīng)通過(guò)測試來(lái)建立芯片的噪聲模型，然后用這個(gè)模型直接仿真，得到的結果就是電源噪聲，但目前還處于探索階段，沒(méi)有推廣使用)，而是仿真電源分配系統的電源阻抗，他們的關(guān)系可以通過(guò)V=R/I來(lái)聯(lián)系。因此如果還是仿真阻抗曲線(xiàn)的話(huà)，測試與仿真不能形成閉環(huán)。</p><p>在衡量這個(gè)阻抗曲線(xiàn)是否能滿(mǎn)足要求的時(shí)候，使用了這個(gè)目標阻抗的標準，但是仔細想想，這個(gè)標準還是有很多問(wèn)題的，比如：這里的電流多大合適?實(shí)際的單板功耗是一個(gè)動(dòng)態(tài)功耗，是不端的變的。在單板的整個(gè)頻段范圍里，使用統一的目標阻抗值，肯定也是不合理的，應該是各個(gè)頻段，標準不一樣。</p><p>雖然有這些問(wèn)題存在，但這個(gè)標準還是很有用的，可以通過(guò)這個(gè)標準衡量電源平面的好壞。就如目前的時(shí)序計算，大家基本上都是通過(guò)公式對時(shí)序進(jìn)行計算，就是所謂的靜態(tài)時(shí)序分析。雖然這個(gè)靜態(tài)時(shí)序分析對電源波動(dòng)，ISI,SSN等問(wèn)題考慮不周到，也就是說(shuō)計算結果不準確，但用來(lái)衡量接口時(shí)序還是很有用的。因此筆者認為，目標阻抗是一個(gè)有用而不準確的標準。</p><p>關(guān)于電容的資料很多，這里只做簡(jiǎn)單介紹，下次將介紹在PI仿真里面很重要的平面板電容。</p><p>電容不僅僅是電容：在頻率很高時(shí)，電容不能再被當作一個(gè)理想的電容看，而應該充分考慮到它的寄生參數效應，通常電容的寄生參數為ESR,ESL。串聯(lián)的RLC電路在f處諧振。其曲線(xiàn)如下圖。圖中f為串聯(lián)諧振頻率(SRF)，在f之前為容性，而在f之后，則為感性，相當一個(gè)電感，所以在選擇濾波電容時(shí)，必須使電容器工作在諧振頻率之前。</p><p align="center"><img src="http://uphotos.eepw.com.cn/fetch/20180719/384136_1_2.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p><p style="text-align: center;">圖2 電容器在高頻時(shí)的曲線(xiàn)圖</p><p>在仿真的時(shí)候，由于目前VRM的模型基本上是不準確的，低頻的濾波靠DC/DC電源轉換芯片來(lái)完成，一般300K以下的低頻阻抗曲線(xiàn)是不準確地。頻率范圍的上限一般取信號的截止頻率fknee=0.35 /Trrise，其中Trise為信號上升時(shí)間。</p><p>但是也要明白一點(diǎn)，如果你只是做板級電源完整性仿真，最多考慮到1G就可以了，因為大于1G以后，要靠芯片內部的電容來(lái)濾波，在做板級仿真的時(shí)候，沒(méi)有芯片內部的模型，所以高頻部分的仿真也是不準確的。當然了，如果您有芯片內部的信息，也可以用SIWAVE等軟件做DIE-PACKAGE-BOARD的協(xié) 同仿真，高頻部分也就準確了。</p><p>因此很多情況下，低頻仿真不出電源負反饋、高頻仿真不出芯片內電容, 我們不要把仿真的結果當做絕對值，可以把它當作是相對值，通過(guò)去耦電容的選擇和放置、電源和地平面的分割等方法來(lái)優(yōu)化阻抗。祝愿各位在做仿真的時(shí)候能靈活運用。</p><p>電源地平面可被當作一個(gè)平板電容器來(lái)對待，尤其在中低頻時(shí)，其ESR、ESL都很小。在這種情況下，電源、地平面作為一個(gè)去耦電容，對RF能量的抑制具有電容器無(wú)可比擬的優(yōu)越性，通常電容器在500MHz以上，由于分布參數的影響，已經(jīng)失去作用，而電源、地平面帽100MHz以上直到GHz的范圍內具有良好的去耦濾波特性。</p><p>電源、地平面的電容粗略計算為：</p><p align="center"><img 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