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      半導體知識
      首頁 > 產品知識>>半導體知識 >>變容二極管的應用

      變容二極管的應用

      變容二極管是電子可變電容。換句話說,變容二極管表現出來的電容是反偏電勢的函數。這種現象導致了變容二極管在一些需要考慮電容因素的場合的幾種常見應用。圖1為一個典型的變容二極管調諧的lc振蕩電路。電路耦合電感l2,的作用是當振蕩電路被當作射頻放大器使用時,將射頻信號輸人到振蕩電路。主要的lc振蕩電路包括主電感l1,和電容c1與cr1的串聯電容。除此之外,還要考慮廣泛存在于電子線路的雜散電容cs。隔直電容和串聯電阻的功能前面已經介紹過了。電容c2的作用是對調諧電壓vin,進行濾波。


       


       

      圖 變容二極管的調諧電路

        因為lc調諧的振蕩電路的諧振頻率是lc的函數,我們發現振蕩電路的最大與最小諧振頻率之比隨著電容比的平方根變化。此處電容比是指反偏電壓最小時的電容與反偏電壓最大時的電容之比。因而,電路的調諧特征曲線(偏壓一諧振頻率)基本上是一條拋物線。

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    3. 更新時間:2016-05-30
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