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偉恩振盪

偉恩振盪. 通訊三甲 B09322003 陳奕全. 電路原理. 　下圖是利用運算放大器組成的偉恩電橋振盪電路。電路中Ｒ、Ｃ是形成頻率調整元件。電路的增益是由 R1 跟 Rf 得到。. 　運算放大器的 +/- 兩端之輸入電壓等於 0 ， V ab =0 ， b= V ab /V o 。 此種狀況下 Ab 會等於 0 ，如此電路是不會振盪的。因此要想辦法使其符合 - Ab>=1 ，因此電橋須在不平衡下輸出且相移要為０。. 電路模擬. 電路實驗.

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偉恩振盪

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  1. 偉恩振盪 通訊三甲 B09322003 陳奕全

  2. 電路原理 　下圖是利用運算放大器組成的偉恩電橋振盪電路。電路中Ｒ、Ｃ是形成頻率調整元件。電路的增益是由R1跟Rf得到。

  3. 　運算放大器的+/-兩端之輸入電壓等於0，Vab=0，b=Vab/Vo。此種狀況下Ab會等於0，如此電路是不會振盪的。因此要想辦法使其符合-Ab>=1，因此電橋須在不平衡下輸出且相移要為０。　運算放大器的+/-兩端之輸入電壓等於0，Vab=0，b=Vab/Vo。此種狀況下Ab會等於0，如此電路是不會振盪的。因此要想辦法使其符合-Ab>=1，因此電橋須在不平衡下輸出且相移要為０。

  4. 電路模擬

  5. 電路實驗

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