為 WiMAX 或 WLAN 猝發(fā)脈沖功率測量選擇恰當(dāng)?shù)墓β视嫼蛡鞲衅?/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 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class="authorTimeSource"> <span>作者：</span> <span>時間：2018-09-12</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="xfvbbrb" 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="t9d1j3v" 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="1hf1t17" class="content" id="contentDiv" style="position:relative;"> <div id="jtzjxfr" 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;"><a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/WiMAX"><em>WiMAX</em></a>或<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/WLAN"><em>WLAN</em></a> 猝發(fā)信號的平均<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/功率測量"><em>功率測量</em></a>是表征無線通信器件(例如芯片組、PC卡、放大器模塊或手機(jī))的一個基本參數(shù)。器件制造商在選擇恰當(dāng)?shù)?a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/功率測量"><em>功率測量</em></a>工具方面遇到越來越多的困難。他們需要對寬帶<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/WiMAX"><em>WiMAX</em></a>和<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/WLAN"><em>WLAN</em></a>信號進(jìn)行快速而精確的<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/功率測量"><em>功率測量</em></a>，還要具備只針對發(fā)射的<span id="t9vhfdd" class="maintext">猝發(fā)<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/脈沖"><em>脈沖</em></a></span>進(jìn)行測量的能力。 <p /><p>通常情況下，只有峰值功率計才能進(jìn)行猝發(fā)<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/脈沖"><em>脈沖</em></a>平均功率測量(又稱“時間選通平均功率測量”或簡稱“猝發(fā)功率”)，它可對信號執(zhí)行快速采樣以捕獲其功率包絡(luò)。用戶可在猝發(fā)<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/脈沖"><em>脈沖</em></a>信號附近設(shè)置兩個游標(biāo)來定義“選通”，從而測量猝發(fā)脈沖信號的平均功率或峰值功率。這是精確測量任何猝發(fā)脈沖信號的峰值功率和平均功率的最常用方法。 </p>本文引用地址：<a href="http://cafeforensic.com/article/201809/388944.htm">http://cafeforensic.com/article/201809/388944.htm</a><p /><p>隨著采用先進(jìn)數(shù)字化技術(shù)和超快速電子元器件的USB功率傳感器的出現(xiàn)，用戶可以更快速度和更低成本來進(jìn)行精確的猝發(fā)脈沖平均功率測量，并且不會影響測量精度。使用時間選通功能，您可以定義選通的起點和長度(參考觸發(fā)輸入信號)，以便選擇所測量的猝發(fā)脈沖信號的相關(guān)部分。 </p><p /><p>下面我們將首先闡明使用寬視頻帶寬和有限視頻帶寬峰值功率計進(jìn)行猝發(fā)脈沖測量的工作原理，然后介紹 USB 平均功率傳感器的工作過程，并考察所有技術(shù)的相關(guān)測量精度。只有了解了這些功率計和傳感器的工作原理后，您才能保證選中恰當(dāng)?shù)墓β视?，獲得精確可靠的測量結(jié)果。 </p><p><b></b></p><p>峰值功率計的視頻帶寬小于被測信號的帶寬對測量的影響 </p><p /><p>峰值功率計的視頻帶寬是峰值功率和平均功率測量的一個重要參數(shù)。為了確保峰值功率和平均功率測量的精確性，功率計和傳感器的帶寬一定要寬于信號帶寬。 </p><p /><p><img src="http://uphotos.eepw.com.cn/fetch/20180719/388944_1_0.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /><br /><i>圖1：輸入功率由于非線性二極管特征而受到壓縮</i></p><p /><p>當(dāng)二極管傳感器檢測到射頻功率包絡(luò)時，要對其進(jìn)行非線性轉(zhuǎn)換。圖1中，紅色波形代表實際功率包絡(luò)(雙音射頻信號)，藍(lán)色波形代表在二極管輸出端檢測到的信號，綠色曲線是二極管檢波器的傳遞函數(shù)。我們可以看到，盡管每個電壓點都可通過互補(bǔ)反函數(shù)反向轉(zhuǎn)換來代表功率，但這對平均功率并不適用。上圖中的調(diào)出功能可以說明這一點。穩(wěn)定在平均電平是對帶寬降低的傳感器的一種限制，這將導(dǎo)致錯誤。為了保持精度，檢波器的每個樣本都要在計算平均值之前進(jìn)行校正。如果帶寬不足，那么實際電壓和檢測到的電壓之間的關(guān)系完全取決于信號的電平和特征，所以無法計算平均值。 </p><p /><p>換句話說就是，視頻帶寬在進(jìn)行線性校正之前對電壓波形進(jìn)行了‘預(yù)平均’，導(dǎo)致平均功率和峰值功率的整體功率測量結(jié)果偏低 (參見圖 2(A))。 </p><p /><p><img src="http://uphotos.eepw.com.cn/fetch/20180719/388944_1_1.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /><br /><i>圖 2：在以下條件下測量寬帶信號猝發(fā)脈沖平均功率的準(zhǔn)確度：（A）功率計和傳感器的視頻帶寬小于信號帶寬；（B）功率計和傳感器的視頻帶寬大于信號帶寬；（C）平均功率傳感器使用雙通道二極管，完全工作在平方律區(qū)域 </i></p><p /><p><b></b> </p><p>使用寬視頻帶寬峰值功率計進(jìn)行猝發(fā)脈沖功率測量</p><p /><p>相反，如果使用寬帶寬功率計進(jìn)行相同的測量，就不會出現(xiàn)視頻帶寬濾波器對功率樣本進(jìn)行‘預(yù)平均’的情況。盡管由于二極管在線性區(qū)域的非線性行為，電壓波形的頂端部分會受到壓縮，但經(jīng)過濾波器后的電壓波形中仍可保留峰值和谷值等信號細(xì)節(jié)。每個電壓樣本再進(jìn)行線性校正，“解壓縮”獲得原始波形。因此，寬帶寬峰值功率計能夠進(jìn)行精確的峰值功率測量和平均功率測量(參見圖 2(B))。 </p><p><b></b> </p><p>使用 USB 平均功率傳感器進(jìn)行猝發(fā)脈沖功率測量</p><p /><p>近年來隨著數(shù)字化技術(shù)的進(jìn)步，現(xiàn)在已經(jīng)可以使用體積更小的功率傳感器進(jìn)行高度精確、可重復(fù)和快速的功率測量。獨(dú)立式傳感器無需使用功率計，即可執(zhí)行功率至電壓的轉(zhuǎn)換、數(shù)據(jù)采集、溫度校正、功率線性校正以及頻率校正，并能完成所有的測量控制。新型 U2000 系列 USB 功率傳感器采用雙通道二極管結(jié)構(gòu)，不僅能夠執(zhí)行真實的平均功率測量，還能夠使用時間選通功能精確測量猝發(fā)脈沖平均功率――用戶可在猝發(fā)脈沖信號附近設(shè)置一對選通，然后測量選通內(nèi)的平均功率。盡管傳感器的視頻帶寬只有幾十kHz，但由于它的雙通道二極管結(jié)構(gòu)能夠完全在平方律區(qū)域工作，它仍然能夠提供精確的信號包絡(luò)輪廓。 </p><p /><p>和峰值傳感器不同的是，使用平均功率傳感器，電壓波形的頂端部分不會由于二極管的非線性而受到壓縮。因此 U2000 系列能夠?qū)⑩Оl(fā)脈沖功率按比例轉(zhuǎn)化成電壓波形，電壓波形再通過傳感器的 RC 濾波電路進(jìn)行視頻帶寬校正。RC 濾波器具有幾十kHz 的帶寬，能夠濾除構(gòu)成猝發(fā)脈沖信號在時域中的峰值和谷值的高頻分量。不過，平均功率將會保持不變，U2000 傳感器仍然能夠提供精確的信號包絡(luò)輪廓，從而獲得精確的猝發(fā)脈沖平均功率測量結(jié)果(參考圖 2(C))。 </p><p><img src="http://uphotos.eepw.com.cn/fetch/20180719/388944_1_2.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /><br /><i>圖 3：使用兩種不同的傳感器（30 MHz 和 30 kHz 傳感器）測量 <span id="3xr1pb9" class="maintext"><a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/WiMAX"><em>WiMAX</em></a></span> 20 MHz 信號的猝發(fā)脈沖平均功率。</i></p><p /><p>下圖是分別使用30MHz和30kHz視頻帶寬的傳感器測得的WiMAX 20MHz信號的功率/時間曲線圖示例。30MHz寬帶寬傳感器保留了OFDM信號的細(xì)節(jié)，包括詳細(xì)的峰值和谷值，而30kHz帶寬傳感器則濾除了高頻分量，僅保留了OFDM信號的包絡(luò)。兩種傳感器測得的平均功率大致相同，而30kHz傳感器測得的峰值功率則會大幅降低。 </p><p><b></b> </p><p>使用U2000系列USB功率傳感器進(jìn)行WiMAX和<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/WLAN"><em>WLAN</em></a>測量</p><p /><p /><p><img src="http://uphotos.eepw.com.cn/fetch/20180719/388944_1_3.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /><br /><i>圖 4：使用 ESG 信號發(fā)生器和 U2001A USB 功率傳感器的猝發(fā)脈沖平均功率測量設(shè)置</i></p><p /><p>本部分闡釋了使用U2000傳感器測量WiMAX 802.11e 28MHz信號和WLAN 802.11g 20MHz 信號的測量設(shè)置(圖4)和精度，并與使用30MHz P系列功率計和傳感器以及300kHz E9325A功率傳感器(圖5)的測量設(shè)置和精度進(jìn)行了對比。 </p><p /><p><img src="http://uphotos.eepw.com.cn/fetch/20180719/388944_1_4.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /><br /><i /></p><p /><p><img src="http://uphotos.eepw.com.cn/fetch/20180719/388944_1_5.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /><br /><i>圖 5：寬帶 WiMAX 和 <span id="5f73b9d" class="maintext">WLAN</span> 信號的猝發(fā)脈沖平均功率測量比較</i></p><p /><p>P系列 N1911A/12A 功率計和N1921A/22A傳感器憑借其平坦和寬廣的30MHz視頻帶寬，可提供最精確的測量。E9325A 具有300kHz的視頻帶寬，可提供高達(dá) -10dBm的良好精度，它的二極管平方律區(qū)域可達(dá)到-10dBm。在-10dBm以上時，由于它的視頻帶寬有限，以及二極管在高功率電平時的非線性，測量結(jié)果開始出現(xiàn)偏差。U2000系列盡管視頻帶寬有限，但由于具有雙通道二極管結(jié)構(gòu)和完全工作在平方律區(qū)域的特性，所以還是能夠?qū)拵?WiMAX信號執(zhí)行精確的測量。U2000傳感器還具有一些其他優(yōu)點，例如更快的測量速度和更經(jīng)濟(jì)的價格。表1對P系列功率計和U2000系列USB功率傳感器執(zhí)行猝發(fā)脈沖功率測量的結(jié)果進(jìn)行了比較。 </p><p /><p><img src="http://uphotos.eepw.com.cn/fetch/20180719/388944_1_6.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p> </span>  <div class="nr9t1zh" 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="99njhzv" class="hAd8"> <br></span>   </div> </article> <div 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