11. 如右圖所示電晶體電路,假設輸入信號Vs為交流小信號且 無直流成分,又電晶體的ro可忽略,則右圖之輸入電阻Rin 為?
(A) β[re+2.65 kΩ]
(B) (1+β)[ re +3 kΩ]
(C) (1+β)[ re +2.65 kΩ]
(D) (1+β)[ re +2.65 kΩ∥3 kΩ]
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統計: A(4), B(4), C(28), D(185), E(0) #1635726
統計: A(4), B(4), C(28), D(185), E(0) #1635726