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class="hLocation"> <p><a href="http://cafeforensic.com" target="_blank">EEPW首頁</a> > <a href="/info/industry/special/analog">模擬技術(shù)</a> > <a href="/info/articlelist/special/analog/type/5">設(shè)計應(yīng)用</a> > ∑-ΔADC(第一部分):基本拓?fù)?/p> </div> </div> </div>    <div class="gs4o4a4" id="container"> <section> <article> <h1>∑-ΔADC(第一部分):基本拓?fù)?/h1> <div id="uoeu44c" class="authorTimeSource"> <span>作者：</span> <span>時間：2012-11-25</span> <span>來源：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="g4o4ucm" 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(shù)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(shù)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="amyq4gm" 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="oceq464" class="content" id="contentDiv" style="position:relative;"> <div id="2ckgiku" 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;">第一部分探究<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/基本拓?fù)?><em>基本拓?fù)?/em></a>和Σ-ΔADC的功能。<P>　　Σ-Δ轉(zhuǎn)換器在從直流到幾MHz信號的寬頻率范圍內(nèi)，都能理想的實現(xiàn)高分辨率信號轉(zhuǎn)換。圖1顯示了<U>Σ-ΔADC</U>的<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/基本拓?fù)?><em>基本拓?fù)?/em></a>或核心，其內(nèi)部為Σ-Δ調(diào)節(jié)器和數(shù)字濾波器的串聯(lián)。研究Σ-ΔADC時，可以發(fā)現(xiàn)雖然它們具有多種特色，但都為這種基本架構(gòu)。這個窗和后面的三個Baker最佳窗研究了<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/基本拓?fù)?><em>基本拓?fù)?/em></a>和這兩個模塊的功能。</P><P>　　</P><CENTER><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" style="WIDTH: 424px; HEIGHT: 223px" alt=Σ-ΔADC的基本拓?fù)?src="http://editerupload.eepw.com.cn/fetch/20131227/206699_1_0.jpg"></CENTER><P></P><P>　　Σ-ΔADC的輸入信號為交流或直流電壓。這個和后三個Baker最佳窗使用單周期正弦波作為輸入信號。使用1位內(nèi)部ADC，圖1中內(nèi)部轉(zhuǎn)換調(diào)節(jié)器采集輸入信號，產(chǎn)生粗量化的輸出作為輸入信號。調(diào)節(jié)器將模擬輸入信號轉(zhuǎn)換為高速脈沖波形。調(diào)節(jié)器輸出脈沖序列一到零的比例反映了輸入模擬電壓。雖然調(diào)節(jié)器產(chǎn)生一個帶噪聲的輸出，但是未來的列說明電路將噪聲“塑造”成更高頻率的輸出頻譜。這個動作為數(shù)字濾波器輸出的低噪聲、高分辨率轉(zhuǎn)換鋪平了道路。</P><P>　　在調(diào)節(jié)器輸出，數(shù)字濾波器解決了高頻噪聲和高速采樣率的問題。因為信號位于數(shù)字域，可以采用低通數(shù)字濾波器削弱高頻率噪聲，采用抽取濾波器減小輸出數(shù)據(jù)的速度。數(shù)字/抽取濾波器采樣和濾除調(diào)節(jié)器1位代碼串，并創(chuàng)建低速多位編碼。</P><P>　　雖然大多數(shù)轉(zhuǎn)換器只有一個采樣率，Σ-Δ轉(zhuǎn)換器卻有兩個：輸入采樣率和輸出數(shù)據(jù)率。這兩個有意義的變量比例定義了系統(tǒng)抽取比例。抽取率和轉(zhuǎn)換器有效分辨率之間存在一個強(qiáng)大的關(guān)系。未來的窗將檢測調(diào)節(jié)器、數(shù)字/抽取濾波器和可調(diào)節(jié)抽取比例怎樣工作。</P> </span>  <div class="e0kweoa" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img 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