[理工] [電子]電子基本題
┌───┐----Vo
│ │
/ >
┌─┤ > RL=100K
│ \ >
┴ │ ┴
│
│↑
Vs─^^^┘└ Ri
Rs=1k
VA=100V B=100 Ic=2mA
求Ri
小弟先用米勒拆橋法求得Ri=re//(ro/101)=0.012 K
再用老劉的公式解Ri=(RL+ro)/(1+u)=0.0374K
請問哪個答案才對阿???怎差距那麼大?
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