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<h1>運算放大電路是如何進行補償?shù)?/h1> <div id="ndttt99" class="authorTimeSource"> <span>作者：</span> <span>時間：2022-11-21</span> <span>來源：</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:150px;margin-right:0px; text-align:right;"> <div id="9fpppx9" class="nav0"> <ul> <li style="width:150px;"><a href="javascript:void(0);"><img src="http://www.ex-cimer.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />英飛凌汽車電子生態(tài)圈</a> <ul> <li style="width:150px;text-align:center;"><img src="http://www.ex-cimer.com/event/company/images/code_2.jpg" width="150"><br />掃碼關(guān)注<br />獲取最新最全汽車電子<br />技術(shù)方案與實用技巧</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="tzphzxr" 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="j9rfx97" class="content" id="contentDiv" style="position:relative;"> <div id="ztdffdl" 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 style="text-indent: 2em; text-align: left;">我們就加入一個能夠使相位超前的高通電路環(huán)節(jié)來對其進行補償，因為高通濾波器具有相位超前的特性，我們就利用他的這個特性來進行補償，從而解決振鈴問題。下面我們就來看看吧。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/202211/440643.htm">http://www.ex-cimer.com/article/202211/440643.htm</a><p><br/></p><p style="text-indent: 2em; text-align: left;">在上一彈中，我們講了振鈴是如何產(chǎn)生的，以及如何去避免振鈴的產(chǎn)生。這一彈我們要講的這是<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/運算放大電路"><em>運算放大電路</em></a>中的相位補償問題，振鈴的產(chǎn)生就是由于相位的滯后導致的，我們這節(jié)講的相位補償同樣也可以解決振鈴的問題，上一節(jié)采用的是破壞反饋回路的低通環(huán)節(jié)來解決甚至避免振鈴問題。而這一節(jié)我們采用相位補償方式解決振鈴問題，這樣想，既然我們沒法避免低通環(huán)節(jié)的產(chǎn)生，我們就加入一個能夠使相位超前的高通電路環(huán)節(jié)來對其進行補償，因為高通濾波器具有相位超前的特性，我們就利用他的這個特性來進行補償，從而解決振鈴問題。下面我們就來看看吧。</p><p><br/></p><p style="text-indent: 2em; text-align: left;">先來看看是如何進行補償?shù)?/p><p><br/></p><p style="text-indent: 2em; text-align: left;">看下面這個簡單電路的例子，</p><p><br/></p><p style="text-indent: 2em; text-align: left;">信號源頻率1KHz,幅值5v,方波，示波器探頭的寄生電容為54P</p><p><br/></p><p style="text-indent: 2em; text-align: left;">R1 1M R2 9 M為分壓電阻。</p><p><br/></p><p style="text-align:center"><img src="http://www.cntronics.com/media/1-0_20221118154804_639.jpg" alt="運算放大電路是如何進行補償?shù)? width="554" height="291" title="運算放大電路是如何進行補償?shù)?/></p><p><br/></p><p>看下這種情況下的輸出波形，由于低通環(huán)節(jié)的存在(積分電路)，導致輸出波形圓頭圓腦。</p><p><br/></p><p><img src="http://www.cntronics.com/media/1-1_20221118154817_182.jpg" alt="運算放大電路是如何進行補償?shù)? width="593" height="265" title="運算放大電路是如何進行補償?shù)?/></p><p><br/></p><p>下面我們加入一個補償環(huán)節(jié)來對電路進行補償，這里我們在R2上并聯(lián)一個電容，容值為6p,整好為54p的1/9，也即電阻比值的反比，至于為啥是這個比例，我們以后再作解釋。今天記住就行。</p><p><br/></p><p>這里先提前說下，針對當前的參數(shù)，補償電容為6P時是處于完全補償狀態(tài)，小于6P則處于欠補償狀態(tài)，大于6P則處于過補償狀態(tài)。下面我們來看看電路仿真以及波形輸出：</p><p><br/></p><p>1、完全補償</p><p><br/></p><p><img src="http://www.cntronics.com/media/1-2_20221118154827_245.jpg" alt="運算放大電路是如何進行補償?shù)? width="624" height="290" title="運算放大電路是如何進行補償?shù)?/></p><p><br/></p><p>補償電容6P</p><p><br/></p><p>波形比較標準。</p><p><br/></p><p><img src="http://www.cntronics.com/media/1-3_20221118154839_381.jpg" alt="運算放大電路是如何進行補償?shù)? width="439" height="242" title="運算放大電路是如何進行補償?shù)?/></p><p><br/></p><p>2、欠補償</p><p><br/></p><p><img src="http://www.cntronics.com/media/1-4_20221118154851_554.jpg" alt="運算放大電路是如何進行補償?shù)? width="565" height="273" title="運算放大電路是如何進行補償?shù)?/></p><p><br/></p><p>補償電容2p</p><p><br/></p><p>欠補償，波形圓頭圓腦。</p><p><br/></p><p><img src="http://www.cntronics.com/media/1-5_20221118154903_871.jpg" alt="運算放大電路是如何進行補償?shù)? width="558" height="315" title="運算放大電路是如何進行補償?shù)?/></p><p><br/></p><p>3、過補償</p><p><br/></p><p>補償電容10p</p><p><br/></p><p><img src="http://www.cntronics.com/media/1-6_20221118154915_847.jpg" alt="運算放大電路是如何進行補償?shù)? width="544" height="263" title="運算放大電路是如何進行補償?shù)?/></p><p><br/></p><p>過補償，波形尖頭尖腦</p><p><br/></p><p><img src="http://www.cntronics.com/media/1-7_20221118154926_618.jpg" alt="運算放大電路是如何進行補償?shù)? width="696" height="324" title="運算放大電路是如何進行補償?shù)?/></p><p><br/></p><p>所以在選擇補償電容時一定要選擇正確的參數(shù)，否則你的補償電路可能會得不償失。</p><p><br/></p><p>相位補償解決振鈴問題</p><p><br/></p><p>采用上面相同的思路，我們同樣也可以解決運放電路中振鈴的問題。拿個電路出來</p><p><br/></p><p>信號頻率10KHz,幅值1 v，反相端寄生電7 nf</p><p><br/></p><p>上述電路是會產(chǎn)生振鈴的：</p><p><br/></p><p><img src="http://www.cntronics.com/media/1-8_20221118154936_838.jpg" alt="運算放大電路是如何進行補償?shù)? width="447" height="213" title="運算放大電路是如何進行補償?shù)?/></p><p><br/></p><p>我們加入補償環(huán)節(jié)：在反饋電阻R2上并聯(lián)一個電容就可以達到補償?shù)淖饔谩?/p><p><br/></p><p>說明： R2和C1構(gòu)成了一個低通濾波環(huán)節(jié)，使相位滯后，兒而我們在R2上并聯(lián)一個電容C2,C2和R1構(gòu)成一個高通濾波器，使相位超前，已達到相位補償?shù)淖饔??？磮D:</p><p><br/></p><p><img src="http://www.cntronics.com/media/1-9_20221118155013_568.jpg" alt="運算放大電路是如何進行補償?shù)? width="497" height="264" title="運算放大電路是如何進行補償?shù)?/></p><p><br/></p><p>看補償后的輸出波形：振鈴基本消失。</p><p><br/></p><p><img src="http://cntadmin.52solution.com/media/1-10_20221118154949_393.jpg" alt="運算放大電路是如何進行補償?shù)? width="538" height="237" 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