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id="1616661" class="hLocation"> <p><a href="http://www.ex-cimer.com" target="_blank">EEPW首頁(yè)</a> > <a href="/info/industry/special/analog">模擬技術(shù)</a> > <a href="/info/articlelist/special/analog/type/5">設(shè)計(jì)應(yīng)用</a> > 高頻小信號(hào)諧振放大電路時(shí)域與頻域?qū)Ρ确治?/p> </div> </div> </div>   <script src="https://forum.eepw.com.cn/jscontent/wenzilian" type="text/javascript"></script>  <div class="6116161" id="container"> <section> <article> <h1>高頻小信號(hào)諧振放大電路時(shí)域與頻域?qū)Ρ确治?/h1> <div id="6111661" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2011-08-10</span> <span>來(lái)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="6661611" 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(shù)交流群</a> <ul> <li style="text-align:center;"><img 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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>摘要：<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/高頻小信號(hào)"><em>高頻小信號(hào)</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/諧振放大電路"><em>諧振放大電路</em></a>，主要是用來(lái)放大采集的微小的高頻電壓信號(hào)，但是放大器的負(fù)載不是線(xiàn)性電阻而是具有選頻功能的諧振網(wǎng)絡(luò)。所以<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/諧振放大電路"><em>諧振放大電路</em></a>能夠?qū)Σ煌l率的信號(hào)進(jìn)行不同增益的放大，在信號(hào)的選擇等方面具有重要的作用。文章從<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/時(shí)域"><em>時(shí)域</em></a>以及頻域兩個(gè)方面對(duì)<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/諧振放大電路"><em>諧振放大電路</em></a>進(jìn)行<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/對(duì)比分析"><em>對(duì)比分析</em></a>。<br />關(guān)鍵詞：諧振；放大器；<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/時(shí)域"><em>時(shí)域</em></a>分析；頻域分析<br /><br />0 引言<br /> 在通信電子電路中，對(duì)于微小的信號(hào)需要進(jìn)行一定增益的放大。通信中的微小信號(hào)都屬于高頻信號(hào)，所以電路的分析都是基于期間的非線(xiàn)性特性進(jìn)行的。非線(xiàn)性電路的輸出中不同頻率分量的信號(hào)分量較多，所以需要采用具有頻率選擇功能的諧振網(wǎng)絡(luò)進(jìn)行頻率的選擇。諧振網(wǎng)絡(luò)頻率選擇的性能直接決定了諧振放大電路的性能。采用<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/時(shí)域"><em>時(shí)域</em></a>波形的觀測(cè)以及頻域不同頻率的頻譜進(jìn)行<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/對(duì)比分析"><em>對(duì)比分析</em></a>，可以清晰地對(duì)諧振放大電路進(jìn)行分析。<br /><br />1 諧振放大電路概述<br /> 諧振電路原理圖中的LC并聯(lián)諧振回路用電阻Rc代替，就是典型的共發(fā)射極電路。它的電壓放大倍數(shù)是Au=βRc／rbe(這里是其絕對(duì)值，沒(méi)有考慮相位問(wèn)題)。由于Rc對(duì)所有的頻率分量都呈現(xiàn)出相同的阻值(阻抗)，故這個(gè)電路沒(méi)有頻率選擇作用(即在很寬的頻率范圍內(nèi)，其放大倍數(shù)是一樣的)。若Rc用LC并聯(lián)諧振回路代替，由于諧振阻抗的頻率特性，使得在諧振頻率點(diǎn)及左右極小的頻率范圍內(nèi)呈現(xiàn)出很高的阻抗，使電路的電壓放大倍數(shù)很高，而離開(kāi)諧振點(diǎn)的其他頻率范圍都呈現(xiàn)出極低的阻抗(理想狀態(tài)下可以看做為零)，使電壓放大倍數(shù)接近于零，于是這個(gè)放大器就有了對(duì)某一頻率有選擇性的放大特性，稱(chēng)為諧振放大器。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/187402.htm">http://www.ex-cimer.com/article/187402.htm</a><p align="center"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" border="0" alt="a.jpg" width="250" height="202" src="http://editerupload.eepw.com.cn/fetch/20131113/187402_1_0.jpg" /></p><p><br /><br />2 小信號(hào)諧振放大電路的時(shí)域分析<br /> 在小信號(hào)諧振放大中，電路的輸入信號(hào)中除了所需要的信號(hào)外還有不需要的信號(hào)，它們的頻譜往往不同，所以用選頻的方法，選取需要的頻率分量，抑制不需要的頻率分量。另外，其中有用信號(hào)的幅度往往也很小，處理這種信號(hào)必須具有選頻和放大雙重功能。小信號(hào)諧振放大器電路中晶體管集電極負(fù)載是LC并聯(lián)諧振電路，其阻抗是隨頻率而變化的，回路諧振頻率f0上的阻抗為純電阻并且是最大的，因此諧振放大器在負(fù)載回路的諧振頻率上具有最大的電壓放大增益，稍離開(kāi)此諧振中心頻率，電壓增益就會(huì)迅速減小。在分析中采用仿真軟件來(lái)測(cè)試諧振放大電路的時(shí)域的輸入輸出波形。分析測(cè)試電路如圖2所示。</span>  <div class="1161616" 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="1166116" class="hAd8"> <br></span>  <div id="1166616" class="quotes"> <span id="1616666" class="pre">上一頁(yè)</span> <span id="1611611" class="current">1</span> <a href="187402_2.htm">2</a> <a 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