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margin:0 auto;"> <div id="g0wa2gs2c" class="wz"> 當前位置：<a href="/">華儀通泰</a><span>?</span><a href="/newslist-4.html">儀器操作說明</a><span>?</span><strong>矢量信號發(fā)生器和普通信號發(fā)生器的區(qū)別</strong> </div> <div id="g0wa2gs2c" class="news-aggregate-mn"> <div id="g0wa2gs2c" class="news-aggregate-panel"> <div id="g0wa2gs2c" class="panel-bd"> <div id="g0wa2gs2c" class="news-detail news-aggregate-detail"> <div id="g0wa2gs2c" class="news-detail-title"> <h1>矢量信號發(fā)生器和普通信號發(fā)生器的區(qū)別</h1> <p> <span>瀏覽量：1117</span>  <span>發(fā)布時間：2021-02-19 16:07:56</span> </p> </div> <div id="g0wa2gs2c" class="news-detail-view"> <p>　　矢量信號發(fā)生器的頻率合成子單元、信號調(diào)理子單元、模擬調(diào)制系統(tǒng)等方面和普通信號發(fā)生器是相同的。矢量信號發(fā)生器和普通信號發(fā)生器的不同之處在于矢量調(diào)制單元和基帶信號發(fā)生單元。</p><p style="text-align: center;"><img src="/Public/Uploads/image/20210219/1613722036270735.png" title="1613722036270735.png" alt="矢量信號發(fā)生器和普通信號發(fā)生器的區(qū)別.png"/></p><p>　　1、矢量調(diào)制單元</p><p>　　所謂數(shù)字調(diào)制就是將需要傳送的信息進行數(shù)字量化，轉(zhuǎn)換成一串二進制代碼，然后利用載波的某些幅度值或相位值分別代表這些代碼來傳送信息。</p><p>　　和模擬調(diào)制一樣，數(shù)字調(diào)制也有三種基本方式，即調(diào)幅、調(diào)相和調(diào)頻。*坐標圖中的不同調(diào)制形式如圖1-3所示，幅度是到圓心的距離，而相位是傾角。幅度調(diào)制只改變信號的幅度。角度調(diào)制只改變信號的相位。幅度調(diào)制和角度調(diào)制可以同時發(fā)生。</p><p>　　在數(shù)字調(diào)制中，經(jīng)常用參數(shù)I和Q來描述，也就是其*坐標圖的直角坐標表示。在*坐標系中，定義I軸沿0°相位方向，Q軸則旋轉(zhuǎn)90°。信號在I軸的投影就是它的I分量，在Q軸的投影就是Q分量。</p><p>　　I信號、Q信號、載波信號的合成是通過矢量調(diào)制器實現(xiàn)的。一個矢量調(diào)制器通常包含四個功能單元：本振90°移相功分單元將輸入的射頻信號轉(zhuǎn)換成正交的兩路射頻信號;兩個混頻器單元將基帶同相信號和正交信號分別和對應的射頻信號相乘;功率合成單元將相乘后的兩路信號求和并輸出。一般所有輸入輸出端口都內(nèi)部端接50Ω負載并采用差分信號驅(qū)動方式，以降低端口回波損耗和提升矢量調(diào)制器的性能。</p><p>　　基帶信號通路和矢量調(diào)制器都不可能是理想的，針對不同的矢量調(diào)制器往往還需要設計不同的驅(qū)動電路，以提高矢量調(diào)制質(zhì)量。常用補償有驅(qū)動增益誤差補償、驅(qū)動偏置電壓補償、IQ正交誤差補償?shù)?。需要注意的是，在使用矢量信號發(fā)生器時，如果使用儀器外部的基帶信號，也可以適當調(diào)整這些補償參數(shù)抵消外部基帶信號的誤差，以得到更高調(diào)制質(zhì)量的數(shù)字調(diào)制信號。</p><p>　　2、基帶信號發(fā)生單元</p><p>　　基帶信號發(fā)生單元用于產(chǎn)生需要的數(shù)字調(diào)制基帶信號，也可以將使用者提供的波形下載到波形存儲器中用于產(chǎn)生使用者定義的格式。基帶信號發(fā)生器通常由突發(fā)脈沖處理器、數(shù)據(jù)發(fā)生器、碼元發(fā)生器、有限沖擊響應(FIR)濾波器、數(shù)字重取樣器、DAC和重構(gòu)濾波器組成。</p><p><br/></p> </div> </div> </div> </div> </div> <div id="g0wa2gs2c" class="news-aggregate-sd"> <div id="g0wa2gs2c" class="xwtji"> <div id="g0wa2gs2c" class="panel-hd"><span>產(chǎn)品推薦</span></div> <div id="g0wa2gs2c" class="panel-xwtj"> <ul class="news-xiw"> <li><a href="/p-11415.html">華儀通泰HY100-02智能型氧氣檢測儀</a> </li><li><a href="/p-11414.html">華儀通泰JQ351-CH2O甲醛檢測儀</a> </li><li><a href="/p-11413.html">華儀通泰UVHY-106L智能臭氧分析儀</a> </li><li><a href="/p-11412.html">華儀通泰AP560 便攜式毒劑檢測儀 </a> </li><li><a href="/p-11411.html">HY106型個人聲暴露計</a> </li><li><a href="/p-11410.html">德國MAHR(馬爾) MARSURF PS10/PS 10 C2表面粗糙度測量儀</a> </li> </ul> </div> </div> <div id="g0wa2gs2c" class="xwtji"> <div id="g0wa2gs2c" class="panel-hd"><span>儀器資訊</span></div> <div id="g0wa2gs2c" class="zx_xzun"> <ul class="zxzx_xwi"> <li><a href="/news-739.html">秋冬季節(jié)靜電防不勝防，這些儀器或許可以派上用場 </a> </li><li><a href="/news-738.html">經(jīng)紫外線殺菌的食物會致癌嗎？</a> </li><li><a href="/news-737.html">《室內(nèi)空氣質(zhì)量標準》最新版公布，主要有這幾點變化，速看?。。?/a> </li><li><a href="/news-736.html">自來水中的余氯超標危害居然那么大？你還敢直接飲用嗎？</a> </li><li><a href="/news-735.html">輻射檢測儀檢測家電時，這種東西輻射量最高！</a> </li><li><a href="/news-734.html">什么是暴露限值以及電磁暴露的危害有哪些？</a> </li><li><a href="/news-733.html">伯托LB124 SCINT表面沾污儀如何設置基本參數(shù)</a> </li><li><a href="/news-732.html">夏季氣候溫熱潮濕，對我們生活中這幾個方面影響較大！</a> </li><li><a href="/news-731.html">0甲醛家具真的靠譜嗎？別再被忽悠了！</a> </li><li><a href="/news-730.html">華儀通泰：端午節(jié)6月3日-5日放假3天</a> </li> </ul> </div> </div> </div> </div> <div id="g0wa2gs2c" class="footer"> <div id="g0wa2gs2c" class="footer_cent"> <div id="g0wa2gs2c" class="container"> <div id="g0wa2gs2c" class="zhjnr_twnr"> <div id="g0wa2gs2c" class="twnr_xtb"> <ul> <li><img src="/Public/IMG/w/xtb2.jpg" /></li> <li><img src="/Public/IMG/w/xtb3.jpg" /></li> <li><img src="/Public/IMG/w/xtb4.jpg" /></li> </ul> </div> <div id="g0wa2gs2c" class="twnr_wzi"> <p><span>北京華儀通泰環(huán)?？萍加邢薰?- 專業(yè)進口儀器供應商！，提供VOC檢測儀,測氡儀,表面沾污儀,活度計,煙氣分析儀,臭氧檢測儀等檢測儀器的銷售及服務</span></span></p> <p><span>網(wǎng)站備案號：<a target="_blank" rel="nofollow">京ICP備20001189號-1</a></span><img src="/Public/IMG/w/tb0.png" /><span>?：13261731718</span></p> </div> </div> </div> </div> <div id="g0wa2gs2c" class="footer_foot">免責聲明：本站信息均收集整理自網(wǎng)絡，版權(quán)歸原作者所有，如若本站內(nèi)容侵犯到您的權(quán)益，請及時告訴我們,馬上修改或刪除 </div> </div> <footer> <div class="friendship-link"> <p>感谢您访问我们的网站，您可能还对以下资源感兴趣：</p> <a href="http://www.oyfm.com.cn/" title="亚洲国产福利成人一区二区">亚洲国产福利成人一区二区</a> <div class="friend-links"> </div> </div> </footer> <script> (function(){ var bp = document.createElement('script'); 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