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Question

In the circuit shown below, assume op-amp is ideal

The z-parameter matrix element Z21,Z22 are respectively


A
(R1R2+R4R5)andR2R3

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B
R3and(R2R4R3+R2)
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C
R2R3and(R1R2+R4R5)
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D
(R2+R2R4R5)andR3
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Solution

The correct option is D (R2+R2R4R5)andR3


Vf=V0[R5R4+R5]

V0=Vf[R3R4+R3]

Vf=I1R2

V0=I1R2[R5R4+R5]

V0=[1+R4R5]×R2I1....(i)

I2=V2V0R3

V0=V2I2R3....(ii)

By equating (i) and (ii),

V2I2R3=[1+R4R5]×R2I1

V2=[(1+R4R5)×R2]I1+R3I2

Z21=(1+R4R5)R2=[R2+R2R4R5]

Z22=R5

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