高頻小信號諧振放大電路時域與頻域?qū)Ρ确治?/title> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head> <body style=""> <h1><a href="http://cafeforensic.com/">色婷婷AⅤ一区二区三区|亚洲精品第一国产综合亚AV|久久精品官方网视频|日本28视频香蕉</a></h1> <div style="position:fixed;left:-9000px;top:-9000px;"><pre id="9xp5p"><sup id="9xp5p"></sup></pre><optgroup id="9xp5p"><legend id="9xp5p"><ol id="9xp5p"><form id="9xp5p"></form></ol></legend></optgroup><strike id="9xp5p"><video id="9xp5p"><listing id="9xp5p"><th id="9xp5p"></th></listing></video></strike><u id="9xp5p"><form id="9xp5p"><form id="9xp5p"><ins id="9xp5p"></ins></form></form></u><p id="9xp5p"><track id="9xp5p"><nobr id="9xp5p"><nobr id="9xp5p"></nobr></nobr></track></p><th id="9xp5p"></th><menuitem id="9xp5p"><mark id="9xp5p"></mark></menuitem><big id="9xp5p"></big><nobr id="9xp5p"></nobr><tt id="9xp5p"><big id="9xp5p"></big></tt><dl 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style="position:relative;">  <div id="fjjn1rl" class="hLogoLocationSearch"> <div id="jx3njln" class="cT"> <h2>新聞中心</h2> </div> <div id="fhdlxnt" 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> > 高頻小信號諧振放大電路時域與頻域?qū)Ρ确治?/p> </div> </div> </div>    <div class="zvtxrjr" id="container"> <section> <article> <h1>高頻小信號諧振放大電路時域與頻域?qū)Ρ确治?/h1> <div id="lrh7531" class="authorTimeSource"> <span>作者：</span> <span>時間：2011-08-10</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="3j3bbhb" 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 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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://cafeforensic.com/news/listbylabel/label/高頻小信號"><em>高頻小信號</em></a><a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/諧振放大電路"><em>諧振放大電路</em></a>，主要是用來放大采集的微小的高頻電壓信號，但是放大器的負(fù)載不是線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://cafeforensic.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率的信號進(jìn)行不同增益的放大，在信號的選擇等方面具有重要的作用。文章從<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/時域"><em>時域</em></a>以及頻域兩個方面對<a class="contentlabel" href="http://cafeforensic.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://cafeforensic.com/news/listbylabel/label/對比分析"><em>對比分析</em></a>。<br />關(guān)鍵詞：諧振；放大器；<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/時域"><em>時域</em></a>分析；頻域分析<br /><br />0 引言<br /> 在通信電子電路中，對于微小的信號需要進(jìn)行一定增益的放大。通信中的微小信號都屬于高頻信號，所以電路的分析都是基于期間的非線性特性進(jìn)行的。非線性電路的輸出中不同頻率分量的信號分量較多，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://cafeforensic.com/news/listbylabel/label/時域"><em>時域</em></a>波形的觀測以及頻域不同頻率的頻譜進(jìn)行<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/對比分析"><em>對比分析</em></a>，可以清晰地對諧振放大電路進(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(這里是其絕對值，沒有考慮相位問題)。由于Rc對所有的頻率分量都呈現(xiàn)出相同的阻值(阻抗)，故這個電路沒有頻率選擇作用(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，而離開諧振點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，于是這個放大器就有了對某一頻率有選擇性的放大特性，稱為諧振放大器。</p>本文引用地址：<a href="http://cafeforensic.com/article/187402.htm">http://cafeforensic.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 小信號諧振放大電路的時域分析<br /> 在小信號諧振放大中，電路的輸入信號中除了所需要的信號外還有不需要的信號，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，其中有用信號的幅度往往也很小，處理這種信號必須具有選頻和放大雙重功能。小信號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，稍離開此諧振中心頻率，電壓增益就會迅速減小。在分析中采用仿真軟件來測試諧振放大電路的時域的輸入輸出波形。分析測試電路如圖2所示。</span>  <div class="lrfzvlp" 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" 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href="http://cafeforensic.com/tech/s/k/濾波器" title="濾波器" target="_blank">濾波器</a></li> <li><a href="http://cafeforensic.com/tech/s/k/CAN總線" title="CAN總線" target="_blank">CAN總線</a></li> <li><a href="http://cafeforensic.com/tech/s/k/開關(guān)電源" title="開關(guān)電源" target="_blank">開關(guān)電源</a></li> <li><a href="http://cafeforensic.com/tech/s/k/單片機(jī)" title="單片機(jī)" target="_blank">單片機(jī)</a></li> <li><a href="http://cafeforensic.com/tech/s/k/PCB" title="PCB" target="_blank">PCB</a></li> <li><a href="http://cafeforensic.com/tech/s/k/USB" title="USB" target="_blank">USB</a></li> <li><a href="http://cafeforensic.com/tech/s/k/ARM" title="ARM" target="_blank">ARM</a></li> <li><a href="http://cafeforensic.com/tech/s/k/CPLD" title="CPLD" target="_blank">CPLD</a></li> <li><a href="http://cafeforensic.com/tech/s/k/連接器" title="連接器" target="_blank">連接器</a></li> <li><a href="http://cafeforensic.com/tech/s/k/MEMS" title="MEMS" target="_blank">MEMS</a></li> <li><a href="http://cafeforensic.com/tech/s/k/CMOS" title="CMOS" target="_blank">CMOS</a></li> <li><a href="http://cafeforensic.com/tech/s/k/MIPS" title="MIPS" target="_blank">MIPS</a></li> <li><a href="http://cafeforensic.com/tech/s/k/EMC" title="EMC" target="_blank">EMC</a></li> <li><a href="http://cafeforensic.com/tech/s/k/EDA" title="EDA" target="_blank">EDA</a></li> <li><a href="http://cafeforensic.com/tech/s/k/ROM" title="ROM" target="_blank">ROM</a></li> <li><a href="http://cafeforensic.com/tech/s/k/陀螺儀" title="陀螺儀" target="_blank">陀螺儀</a></li> <li><a href="http://cafeforensic.com/tech/s/k/VHDL" title="VHDL" target="_blank">VHDL</a></li> <li><a href="http://cafeforensic.com/tech/s/k/比較器" title="比較器" target="_blank">比較器</a></li> <li><a href="http://cafeforensic.com/tech/s/k/Verilog" title="Verilog" target="_blank">Verilog</a></li> <li><a href="http://cafeforensic.com/tech/s/k/穩(wěn)壓電源" title="穩(wěn)壓電源" target="_blank">穩(wěn)壓電源</a></li> <li><a href="http://cafeforensic.com/tech/s/k/RAM" title="RAM" target="_blank">RAM</a></li> <li><a href="http://cafeforensic.com/tech/s/k/AVR" title="AVR" target="_blank">AVR</a></li> <li><a href="http://cafeforensic.com/tech/s/k/傳感器" title="傳感器" target="_blank">傳感器</a></li> <li><a href="http://cafeforensic.com/tech/s/k/可控硅" title="可控硅" target="_blank">可控硅</a></li> <li><a href="http://cafeforensic.com/tech/s/k/IGBT" title="IGBT" target="_blank">IGBT</a></li> <li><a href="http://cafeforensic.com/tech/s/k/嵌入式開發(fā)" title="嵌入式開發(fā)" target="_blank">嵌入式開發(fā)</a></li> <li><a href="http://cafeforensic.com/tech/s/k/逆變器" title="逆變器" target="_blank">逆變器</a></li> <li><a href="http://cafeforensic.com/tech/s/k/Quartus" title="Quartus" target="_blank">Quartus</a></li> <li><a href="http://cafeforensic.com/tech/s/k/RS-232" title="RS-232" target="_blank">RS-232</a></li> <li><a href="http://cafeforensic.com/tech/s/k/Cyclone" title="Cyclone" target="_blank">Cyclone</a></li> <li><a href="http://cafeforensic.com/tech/s/k/電位器" title="電位器" target="_blank">電位器</a></li> <li><a href="http://cafeforensic.com/tech/s/k/電機(jī)控制" title="電機(jī)控制" target="_blank">電機(jī)控制</a></li> <li><a href="http://cafeforensic.com/tech/s/k/藍(lán)牙" title="藍(lán)牙" target="_blank">藍(lán)牙</a></li> <li><a href="http://cafeforensic.com/tech/s/k/PLC" title="PLC" target="_blank">PLC</a></li> <li><a href="http://cafeforensic.com/tech/s/k/PWM" title="PWM" target="_blank">PWM</a></li> <li><a href="http://cafeforensic.com/tech/s/k/汽車電子" title="汽車電子" target="_blank">汽車電子</a></li> <li><a href="http://cafeforensic.com/tech/s/k/轉(zhuǎn)換器" title="轉(zhuǎn)換器" target="_blank">轉(zhuǎn)換器</a></li> <li><a href="http://cafeforensic.com/tech/s/k/電源管理" title="電源管理" target="_blank">電源管理</a></li> <li><a href="http://cafeforensic.com/tech/s/k/信號放大器" title="信號放大器" target="_blank">信號放大器</a></li> </ul> </div>  </div>   <div class="vjhp7jl" id="imgdiv" style="display:none;position:absolute;border:#ccc 1px 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