Ignoring early effect, if R1 is the total resistance connected to the – McqOptions

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1.	Ignoring early effect, if R₁ is the total resistance connected to the base and R₂ is the total resistance connected at the collector, what could be the approximate input pole of a simple C.E. stage?
A.	1 / [R<sub>1</sub> * (C<sub> </sub>(2+g<sub>m</sub>*R<sub>2</sub>) + C<sub> </sub>)]
B.	1 / [R<sub>1</sub> * (C<sub> </sub>(1+2g<sub>m</sub>R<sub>2</sub>) + C<sub> </sub>)]
C.	1 / [R<sub>1</sub> * (C<sub> </sub>(1+g<sub>m</sub>*R<sub>2</sub>) + C<sub> </sub>)]
D.	1 / [R<sub>1</sub> * (C<sub> </sub>(1-g<sub>m</sub>*R<sub>2</sub>) + C<sub> </sub>)]
Answer» D. 1 / [R<sub>1</sub> * (C<sub> </sub>(1-g<sub>m</sub>*R<sub>2</sub>) + C<sub> </sub>)]

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