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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>隨著超大規(guī)模集成電路工藝的發(fā)展，芯片工作電壓越來越低，而工作速度越來越快，功耗越來越大，單板的密度也越來越高，因此對(duì)電源供應(yīng)系統(tǒng)在整個(gè)工作頻帶內(nèi)的穩(wěn)定性提出了更高的要求。<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/電源完整性"><em>電源完整性</em></a>設(shè)計(jì)的水平直接影響著系統(tǒng)的性能，如整機(jī)可靠性，信噪比與誤碼率，及EMI/EMC等重要指標(biāo)。板級(jí)電源通道阻抗過高和同步開關(guān)噪聲SSN過大會(huì)帶來嚴(yán)重的<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/電源完整性"><em>電源完整性</em></a>問題，這些會(huì)給器件及系統(tǒng)工作穩(wěn)定性帶來致命的影響。PI設(shè)計(jì)就是通過合理的平面電容、分立電容、平面分割應(yīng)用確保板級(jí)電源通道阻抗?jié)M足要求，確保板級(jí)電源質(zhì)量符合器件及產(chǎn)品要求，確保信號(hào)質(zhì)量及器件、產(chǎn)品穩(wěn)定工作。</p>本文引用地址：<a href="http://cafeforensic.com/article/201807/384136.htm">http://cafeforensic.com/article/201807/384136.htm</a><p><a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/電源完整性"><em>電源完整性</em></a>PI與信號(hào)完整性SI的相互影響：從整個(gè)<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/仿真"><em>仿真</em></a>領(lǐng)域來看，剛開始大家都把注意力放在信號(hào)完整性上，但是實(shí)際上電源完整性和信號(hào)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(hào)線提供參考回路，直接決定回流路徑，從而影響信號(hào)的完整性;同樣信號(hào)完整性的不同處理方法也會(huì)給電源系統(tǒng)帶來不同的沖擊，進(jìn)而影響電源的完整性設(shè)計(jì)。所以對(duì)電源完整性和信號(hào)的完整性地融會(huì)貫通是很有益處的。設(shè)計(jì)工程師在掌握了信號(hào)完整性設(shè)計(jì)方法之后，充實(shí)電源完整性設(shè)計(jì)知識(shí)顯得很有必要。</p><p>電源完整性研究的內(nèi)容：電源完整性<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/仿真"><em>仿真</em></a>的內(nèi)容很多，但主要的幾個(gè)方面如下：</p><p>1：板級(jí)電源通道阻抗<a class="contentlabel" href="http://cafeforensic.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(chǔ)上，通過仿真分析確定旁路電容的數(shù)量、種類、位置等，以確保板級(jí)電源通道阻抗?jié)M足器件穩(wěn)定工作要求。</p><p>2：板級(jí)直流壓降仿真分析，確保板級(jí)電源通道滿足器件的壓降限制要求。</p><p>3：板級(jí)諧振分析，避免板級(jí)諧振對(duì)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(tǒng)特性圖</p><p>電源分配系統(tǒng)(PDS)：上圖是一張經(jīng)典的電源分配系統(tǒng)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(zhuǎn)換芯片VRM來濾波。在幾MHZ到幾百M(fèi)HZ的頻段，電源噪聲主要是由板級(jí)分立電容和PCB的電源地平面對(duì)來濾波。在高頻部分，電源噪聲主要是由PCB的電源地平面對(duì)和芯片內(nèi)部的高頻電容來濾波。我們?cè)谧龇抡娴臅r(shí)候，對(duì)低頻和高頻部分的仿真精度都還不準(zhǔn)確，真正有意義的頻段主要還是在幾MHZ到幾百M(fèi)HZ這個(gè)頻段。</p><p>該聊聊大家都很熟悉的目標(biāo)阻抗Ztarget了。筆者認(rèn)為，這個(gè)目標(biāo)阻抗是電源完整性仿真里的一個(gè)有用但不精確的標(biāo)準(zhǔn)。</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(biāo)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(shù)</p><p>Current 是工作電流，目前這個(gè)值是用最大電流的1/2來替代。</p><p>大家都知道，電源測(cè)試的時(shí)候，主要是測(cè)試紋波，噪聲，但是業(yè)界目前還很難通過軟件進(jìn)行時(shí)域的紋波噪聲仿真(一些大公司已經(jīng)通過測(cè)試來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(jié)果就是電源噪聲，但目前還處于探索階段，沒有推廣使用)，而是仿真電源分配系統(tǒng)的電源阻抗，他們的關(guān)系可以通過V=R/I來聯(lián)系。因此如果還是仿真阻抗曲線的話，測(cè)試與仿真不能形成閉環(huán)。</p><p>在衡量這個(gè)阻抗曲線是否能滿足要求的時(shí)候，使用了這個(gè)目標(biāo)阻抗的標(biāo)準(zhǔn)，但是仔細(xì)想想，這個(gè)標(biāo)準(zhǔn)還是有很多問題的，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(tǒng)一的目標(biāo)阻抗值，肯定也是不合理的，應(yīng)該是各個(gè)頻段，標(biāo)準(zhǔn)不一樣。</p><p>雖然有這些問題存在，但這個(gè)標(biāo)準(zhǔn)還是很有用的，可以通過這個(gè)標(biāo)準(zhǔn)衡量電源平面的好壞。就如目前的時(shí)序計(jì)算，大家基本上都是通過公式對(duì)時(shí)序進(jìn)行計(jì)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(duì)電源波動(dòng)，ISI,SSN等問題考慮不周到，也就是說計(jì)算結(jié)果不準(zhǔn)確，但用來衡量接口時(shí)序還是很有用的。因此筆者認(rèn)為，目標(biāo)阻抗是一個(gè)有用而不準(zhǔn)確的標(biāo)準(zhǔn)。</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(dāng)作一個(gè)理想的電容看，而應(yīng)該充分考慮到它的寄生參數(shù)效應(yīng)，通常電容的寄生參數(shù)為ESR,ESL。串聯(lián)的RLC電路在f處諧振。其曲線如下圖。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(dāng)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)的曲線圖</p><p>在仿真的時(shí)候，由于目前VRM的模型基本上是不準(zhǔn)確的，低頻的濾波靠DC/DC電源轉(zhuǎn)換芯片來完成，一般300K以下的低頻阻抗曲線是不準(zhǔn)確地。頻率范圍的上限一般取信號(hào)的截止頻率fknee=0.35 /Trrise，其中Trise為信號(hào)上升時(shí)間。</p><p>但是也要明白一點(diǎn)，如果你只是做板級(jí)電源完整性仿真，最多考慮到1G就可以了，因?yàn)榇笥?G以后，要靠芯片內(nèi)部的電容來濾波，在做板級(jí)仿真的時(shí)候，沒有芯片內(nèi)部的模型，所以高頻部分的仿真也是不準(zhǔn)確的。當(dāng)然了，如果您有芯片內(nèi)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(zhǔn)確了。</p><p>因此很多情況下，低頻仿真不出電源負(fù)反饋、高頻仿真不出芯片內(nèi)電容, 我們不要把仿真的結(jié)果當(dāng)做絕對(duì)值，可以把它當(dāng)作是相對(duì)值，通過去耦電容的選擇和放置、電源和地平面的分割等方法來優(yōu)化阻抗。祝愿各位在做仿真的時(shí)候能靈活運(yùn)用。</p><p>電源地平面可被當(dāng)作一個(gè)平板電容器來對(duì)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(duì)RF能量的抑制具有電容器無可比擬的優(yōu)越性，通常電容器在500MHz以上，由于分布參數(shù)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(nèi)具有良好的去耦濾波特性。</p><p>電源、地平面的電容粗略計(jì)算為：</p><p align="center"><img src="http://uphotos.eepw.com.cn/fetch/20180719/384136_1_3.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p> </span>  <div class="n91zjl1" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> <map name="Map" id="Map"> <area shape="rect" coords="133,235,319,253" target="_blank" /> <area shape="rect" coords="132,315,319,335" /> </map> </center> </div>  <span id="pvtj9fz" 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