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=α2≈1)
A
gm≈gm1+gm2
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B
gm≈gm1−gm2
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C
gm≈gm1
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D
gm≈gm2
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