For a high frequency response of a simple C.E. stage with a transcond – McqOptions

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1.	For a high frequency response of a simple C.E. stage with a transconductance of gm, what is Cin?
A.	Cµ(1 + gm*R2) – Cπ
B.	Cµ(1 + gm*R2) + Cπ
C.	Cµ(1 – 2gmR2) + Cπ
D.	Cµ(1 + 2gmR2) – Cπ
Answer» C. Cµ(1 – 2gmR2) + Cπ

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