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style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="vytvrew" class="nav0"> <ul> <li><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" />加入技術交流群</a> <ul> <li style="text-align:center;"><img src="http://www.ex-cimer.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="jmzfsvy" 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="mprihgu" class="content" id="contentDiv" style="position:relative;"> <div id="mlrezru" 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>　　在分布式系統(tǒng)中，<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/模擬信號"><em>模擬信號</em></a>在<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/傳感器"><em>傳感器</em></a>或負載間來回遠程傳輸。在這類系統(tǒng)中，信號要傳輸很長的距離，噪聲抑制能力成為一個重要考慮因素。噪聲會耦合進信號中，結果使數(shù)據(jù)遭到破壞，由此產生不良影響。系統(tǒng)需要得到適當?shù)谋Ｗo，了解預期噪聲的量和性質可以明確需要采取的保護措施，以取消或者至少減少環(huán)境干擾水平。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/201603/288462.htm">http://www.ex-cimer.com/article/201603/288462.htm</a><p>　　噪聲源或干擾源一般有兩種，根據(jù)其耦合進主信號的方式，分為共模噪聲和差模噪聲兩種，如圖1所示。</p><p>　　 <center><img alt="image1.jpeg" src="http://editerupload.eepw.com.cn/201603/97251458267508.jpg" width="378" height="289" /></center><p> </p><p style="text-align:center">　　圖1.噪聲源</p><p>　　二者中危害較小是共模噪聲，它會同時耦合到系統(tǒng)GND信號和激勵信號中，這主要是由電纜與真實GND間的偶極天線效應造成的。這種情況不會使信號減弱，因為噪聲同時耦合進兩個通道，而且幅度相似。問題在于，共模噪聲會產生信號失調，使真實GND升高，結果導致兩種不良效應。首先，如果間接折合到真實GND(比如，通過金屬箱保護<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/傳感器"><em>傳感器</em></a>時)，則可能使負載飽和。其次，可能產生電弧，結果會損壞<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/傳感器"><em>傳感器</em></a>。在激勵惠斯登電橋時，共模噪聲尤其麻煩，因為輸出信號需要由控制器進行處理，通常是用到一個儀表放大器，而這種放大器的CMRR有限，結果可能會放大噪聲。</p><p>　　使用低通濾波器(如RC濾波器)，或者使用共模扼流圈來過濾輸入信號，可以減少共模噪聲。重要的是，不對稱衰減的共模噪聲會產生差模噪聲。在實際應用中，不對稱衰減的一個例子是低通濾波器;用一個電阻和電容實現(xiàn)截止頻率，但受元件容差影響，兩條線路中的截止頻率不一樣。</p><p>　　第二種，也是最麻煩的噪聲是差模噪聲，這種噪聲是在激勵與系統(tǒng)GND之間耦合的。該噪聲之所以會耦合到信號中，是因為系統(tǒng)GND與充當天線的信號電纜之間存在電流環(huán)路。在部分應用中(如化學分析)，出于安全考慮，傳感器有時置于獨立于控制器的腔室中。這種設置會導致數(shù)十或數(shù)百米的電流環(huán)路，結果，任何磁通量都可能在信號中導致電流噪聲，從而使數(shù)據(jù)遭到破壞。為了減少差模噪聲的影響，建立使用鐵氧體材料來過濾高頻輻射信號，在控制器與傳感器之間采用星型連接，同時還要使用屏蔽電纜。</p><p>　　兩種情況下，如果該噪聲足夠大，設備甚至可能會因為電氣過應力而受損。當負載為電機或熒光燈時，尤其如此，這樣的負載構成一種強大的電磁兼容性/干擾(EMC/EMI)源;原因有二，分別為物理電磁元件和所產生信號的性質。一種較好的做法是使用EMC/EMI抑制器，如ESD保護裝置，以確保系統(tǒng)能維持一定的穩(wěn)定水平。</p><p>　　在實現(xiàn)部分前述方法時，主要后果是與元件相關的電容。甚至電纜也會含有寄生電容，因此不能忽略。寄生電容與電纜的長度、類型和類別成比例，如表1所示。</p><p>　　 <center><img alt="image2.jpeg" src="http://editerupload.eepw.com.cn/201603/85561458267508.jpg" width="467" height="157" /></center><p> </p><p style="text-align:center">　　表1.不同電纜類型比較</p><p>　　集成式緩沖電壓DAC，如AD5683R或AD5686R，可提供高壓擺率、高帶寬，而且功耗更低，功耗已成為業(yè)界的一個主要關注點，原因多種多樣，比如電路板溫度的降低、電路板組件數(shù)量的增加(不增加功率)、功效的提高等。結果，內部放大器的阻抗ZO(開環(huán)阻抗)變大(不要與閉環(huán)阻抗ZOUT相混淆)，對最大負載電容形成限制。</p><p>　　如果與運算放大器輸出相連的電容超過最大允許值，結果會影響運算放大器的穩(wěn)定性，可能導致放大器振鈴和振蕩。</p><p>　　通過運用緩沖電壓DAC，可用來降低運算放大器不穩(wěn)定性的方法有以下幾種：</p><p>　　1.RSHUNT法</p><p>　　2.外部負載網絡補償(緩沖電路)法</p><p>　　RSHUNT法需要的外部組件最少，其背后的原理相對簡單;通過在運算放大器與負載之間放置分立式電阻使二者相隔離。</p><p>　　RSHUNT在反饋網絡的傳遞函數(shù)中增加一個零，結果使閉環(huán)在高頻下能保持穩(wěn)定。選擇的這個零應至少比GBP(增益帶寬積)低一個十倍頻程。但這里的問題是，DAC的技術規(guī)格不包括這個數(shù)字，原因是其不相關，因為內部運算放大器充當?shù)氖蔷彌_器。</p><p>　　在這種情況下，根據(jù)經驗法則，應該選擇一個盡量小的值，以減少電阻的影響;其范圍一般在5 Ω至50 Ω之間。如果使用該方法，負載電壓會下降，因為這種方法在物理上實現(xiàn)為一個電阻分壓器，會影響其他規(guī)格，比如，壓擺率降低，建立時間延長等。結果，DAC在負載或傳感器端的整體性能會下降。</p><p>　　通過增加RSHUNT值，阻尼比(ζ)也會隨之增加，使其成為一種合適的電機驅動方法;但是，當負載幅度較小且電壓軌較低時(如惠斯登電橋激勵)，不建議使用這種方法，因為可能導致幅度大幅下降。減小電壓范圍，比如，使用阻抗為1 kΩ的5 V供電軌，結果，降幅為2.5%左右，如圖2所示。</p><p>　　 <center><img alt="image3.jpeg" src="http://editerupload.eepw.com.cn/201603/38091458267509.jpg" width="366" height="340" /></center><p> </p><p style="text-align:center">　　圖2.RSHUNT法</p><p>　　緩沖法(或RC分路法)不會減小負載電壓范圍，因而是低電壓應用的首選方法。這種方法背后的原理略有不同。緩沖網絡會減小靠近振蕩頻率的負載阻抗，使負載的實部低于虛部，結果改變相位。</p><p>　　正確元件值的選擇方法需要憑經驗確定，要分析與負載相連的DAC的瞬態(tài)響應。</p><p>　　一般地，計算的前提是緩沖器GBP低于1 MHz。這種情況下，設電纜寄生電容為47 nF，分布式系統(tǒng)中<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/模擬信號"><em>模擬信號</em></a>遠程傳輸?shù)脑肼曇种?/p><p>　　理想電阻應低于1 ?，RSNUBBER值越低，過沖就越低;但從實際應用角度來看，我們不妨選擇RSNUBBER = 10 ?。</p><p>　　緩沖器極需要比振蕩頻率高三分之一，</p><p>　　 <center><img alt="image5.jpeg" src="http://editerupload.eepw.com.cn/201603/17601458267509.jpg" width="230" height="38" /></center><p> </p><p>　　 <center><img alt="image6.jpeg" src="http://editerupload.eepw.com.cn/201603/89701458267509.jpg" width="365" height="397" /></center><p> </p><p style="text-align:center">　　圖3.緩沖法</p><p>　　緩沖法和分路法對于補償或隔離容性負載十分有用，當負載或傳感器需要遠程激勵時，可使DAC保持穩(wěn)定。</p><p>　　以上示例均基于AD5683R DAC。這款器件采用超小封裝，整體性能卓越，并且擁有2 LSB INL @ 16位、35 mA驅動能力，集成了基準電壓源，更有高達4 kV ESD的魯棒性，眾多優(yōu)點使其成為負載或板外傳感器激勵的理想DAC。</p></p></p></p></p></p></span>  <div class="fpgioru" 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="nmdqery" class="hAd8"> <br></span>   </div> </article> <div id="llyacut" class="clear"></div> <br/> <div id="ovtompl" class="hAd6"> <div class="phuarje" 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' frameborder='0' scrolling='no' width='650' height='30'><a target='_blank'><img 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