37 如圖所示之電路,假設電晶體操作在順向主動區,IC = 0.838 mA,V..-阿摩線上測驗
37 如圖所示之電路,假設電晶體操作在順向主動區,IC = 0.838 mA,VT = 26 mV,β = 100,Cπ = 24 pF,
Cμ = 3 pF,忽略爾利(Early)與所有其他電容效應,求相關於輸出端之 3 dB 頻率為何?
(A)28.4 MHz
(B)38.4 MHz
(C)48.4 MHz
(D)58.4 MHz
2F
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3F
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4F edison95204 幼兒園下 (2018/09/15)
樓上 Cu2算法為題型 C-E or C-S 式 因 Cu有米勒效應 此題為C-B式 故Cu無米勒效應 Cu直接拉地 輸出端 W3db=1/R'Cu R'=10//1 =0.91 W=1/3p*0.91k =366.3M f=W/2拍 =366.3M/6.28 =58.3M Hz |