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Question

Consider a two stage amplifier circuit shown in the figure below.

The transconductance of the transistor T1 and T2 are gm1 and gm2 respectively, then the overall transconductance gm=IoVi is equal to
(Assume α1=α21)

A
gmgm1+gm2
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B
gmgm1gm2
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C
gmgm1
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D
gmgm2
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