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text-align:right;"> <div id="pdt3fxd" class="nav0"> <ul> <li><a href="javascript:void(0);"><img src="http://cafeforensic.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />加入技術交流群</a> <ul> <li style="text-align:center;"><img src="http://cafeforensic.com/event/company/images/code_1.jpg" width="130"><br />掃碼加入<br />和技術大咖面對面交流<br />海量資料庫查詢</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="djdrnxh" 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="3bl5xl1" class="content" id="contentDiv" style="position:relative;"> <div id="n9hxrvh" 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;"><strong>1 引言</strong> <br /><br />帶隙基準源廣泛應用于各類集成電路|0"><a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/集成電路"><em>集成電路</em></a>之中。在現(xiàn)代<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/集成電路"><em>集成電路</em></a>日益發(fā)展的今天，<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/帶隙基準源"><em>帶隙基準源</em></a>扮演了極其重要的角色。在<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/A／D"><em>A／D</em></a>，<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/D／A"><em>D／A</em></a>轉(zhuǎn)換器以及一些模擬和數(shù)字電路中，<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/帶隙基準源"><em>帶隙基準源</em></a>起著至關重要的作用，它的溫度特性和抗噪聲能力直接決定了整體電路的精度和性能。因此，提高<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/帶隙基準源"><em>帶隙基準源</em></a>的精度是十分重要的。 <br /><br />本文介紹帶曲率補償?shù)膸痘鶞试吹脑?，并將其與傳統(tǒng)帶隙基準源進行比較，突出其在溫度特性上的優(yōu)點，并介紹一種運用曲率補償?shù)膸痘鶞试措娐贰?<br /><br /><strong>2 傳統(tǒng)帶隙基準源原理</strong> <br /><br />帶隙基準的原理是產(chǎn)生分別帶正溫度系數(shù)和負溫度系數(shù)的電壓，然后通過電路讓其相加得到溫度系數(shù)很小，甚至沒有溫度系數(shù)的電壓。 <br /><br />傳統(tǒng)帶隙基準的電路結(jié)構(gòu)如圖1所示。 <br /><br />負溫度系數(shù)電壓由雙極性晶體管的基極-發(fā)射極電壓產(chǎn)生。我們可以得到： <br /><br /><p align="center"><img src="http://uphotos.eepw.com.cn/fetch/20170417/347286_1_0.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p>本文引用地址：<a href="http://cafeforensic.com/article/201706/347286.htm">http://cafeforensic.com/article/201706/347286.htm</a>正溫度系數(shù)電壓由工作在不同電流密度的兩個雙極型晶體管產(chǎn)生，其結(jié)電壓<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/VBE"><em>VBE</em></a>的差值△<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/VBE"><em>VBE</em></a>就表現(xiàn)出正溫度系數(shù)。當兩個晶體管的尺寸相同，但集電極的電流分別是nIS1IS2。那么可得： <br /><br /><p align="center"><img src="http://uphotos.eepw.com.cn/fetch/20170417/347286_1_1.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p>其中IS1=IS2。該溫度系數(shù)與溫度或集電極電流特性無關。 <br /><br />上述帶正負溫度系數(shù)的電壓，通過如圖1所示方式相加，可得： <br /><br /><p align="center"><img src="http://uphotos.eepw.com.cn/fetch/20170417/347286_1_2.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p>為了得到零溫度系數(shù)，可以通過調(diào)整R2，R3的大小得到。但是傳統(tǒng)帶隙基準源在工作溫度變化幅度比較大時，輸出電壓的精度會變低。 <br /><br /><strong>3 運用曲率補償?shù)膸痘鶞试?/strong> <br /><br />3.1 曲率補償?shù)膸痘鶞试丛?<br /><br />雙極型晶體管的基極-發(fā)射極電壓<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/VBE"><em>VBE</em></a>并不隨溫度線性變化，而是由式(5)確定： <br /><br /><p align="center"><img src="http://uphotos.eepw.com.cn/fetch/20170417/347286_1_3.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p>其中，VBG是硅的能隙電壓，它只與材料本身有關。η是硅遷移率的溫度系數(shù)，其值大約為4。從上式可以看出，VBE可分為常數(shù)項，與溫度一階相關項和高階相關項。在傳統(tǒng)帶隙基準源中，正溫度系數(shù)只補償了一階相關項，得到的電壓與溫度高階相關。 <br /><br />因此，為了消除高階項對電壓的影響，電路中要引入帶正溫度系數(shù)的高階項電壓。式(5)中，當流過二極管的電流為PTAT電流時，a=1。可得： <br /><br /><p align="center"><img src="http://uphotos.eepw.com.cn/fetch/20170417/347286_1_4.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p>當流過二極管的電流與溫度不相關時，a=0。可得： <br /><br /><p align="center"><img src="http://uphotos.eepw.com.cn/fetch/20170417/347286_1_5.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p>將式(6)，式(7)相減，即可得與溫度高階相關項成正比的電壓。 <br /><br /><p align="center"><img src="http://uphotos.eepw.com.cn/fetch/20170417/347286_1_6.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p>3.2 帶隙基準源電路結(jié)構(gòu)及其分析 <br /><br />圖2所示為新型帶隙基準源電路的核心部分。相比傳統(tǒng)帶隙基準電路中采用運算放大器的兩端產(chǎn)生等電位的方式，該電路使用的方式更加精確。傳統(tǒng)帶隙基準電路使用運算放大器的兩端作為電路的等電位點，但運算放大器存在輸入失調(diào)電壓。輸入失調(diào)電壓會影響基準電壓的精度。新型帶隙基準電路采用自舉電流源強制Q1和Q2的電流相等，消除了運算放大器失調(diào)電壓對輸出電壓的影響，并且電路具有較高的電源電壓抑制比。同時，該電路不僅能產(chǎn)生帶隙基準電壓源，而且能產(chǎn)生帶隙基準電流源。 <br /><p align="center"><img src="http://uphotos.eepw.com.cn/fetch/20170417/347286_1_7.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p>圖2中，Q1，Q2，R1，R2，R3產(chǎn)生了帶隙基準電路的一階溫度補償。Q1和Q2流過的電流相等。Q1的尺寸是Q2的4倍，那么流過R2的電流為： <br /><br /><p align="center"><img src="http://uphotos.eepw.com.cn/fetch/20170417/347286_1_8.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p>由基爾霍夫定律，將式(9)，式(10)，式(13)相加后，可以得到流過該電流源的電流，并通過鏡像電流源產(chǎn)生與溫度不相關的電壓Vref，其輸出電壓表達式為： <br /><br /><p align="center"><img src="http://uphotos.eepw.com.cn/fetch/20170417/347286_1_9.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p>式(14)中，I2可對輸出電壓進行一階溫度補償，I3可對輸出電壓進行二階溫度補償。然后通過調(diào)整電路中的電阻值，可以得到理論上與溫度無關的高精度電壓源。 <br /><br /><strong>4 仿真結(jié)果與分析</strong> <br /><br />本文基于0.6μm的CMOS工藝模型，并用Spectre進行了仿真。圖3給出了經(jīng)過曲率補償后的溫度掃描曲線。經(jīng)過二次曲率補償?shù)那€，在-50～+125℃的溫度范圍中，最大和最小值之差僅為1.98 mV，平均溫度系數(shù)為4.47 ppm／℃。 <br /><br /><p align="center"><img src="http://uphotos.eepw.com.cn/fetch/20170417/347286_1_10.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p><p><strong>5 結(jié) 語 <br /></strong><br />本文分析了傳統(tǒng)帶隙基準電路和帶曲率補償?shù)膸痘鶞孰娐?，在理論上闡述了傳統(tǒng)帶隙基準的不足以及帶曲率補償帶隙基準電路的先進之處，提出了一種帶曲率補償?shù)膸痘鶞试措娐罚?jīng)過仿真，在-50～+125℃的溫度范圍中，新型帶隙基準電路的平均溫度系數(shù)為4.47 ppm／℃。該結(jié)果顯示帶曲率補償?shù)膸痘鶞孰娐肪哂懈玫臏囟忍匦浴?</p><p></p> </span>  <div class="jpnddx3" 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="bbxnll1" class="hAd8"> <br></span>   </div> </article> <div id="rb1txtv" class="clear"></div> <br/> <div id="l9z99lr" class="hAd6"> <div class="7pflb9r" id="relA" style="width:auto;height:auto;"> <ul> <li>  <iframe id='af71d594' name='af71d594' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=114&cb=INSERT_RANDOM_NUMBER_HERE' 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