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For the circuit given below determine the input common mode resistance.

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For the circuit given below determine the input common mode resistance.

(a) (R1 + R3) || (R2) || +  (R4)

(b) (R1 + R4) || (R2 + R3)

(c) (R1 + R2) || (R3 + R4)

(d) (R1 + R3) || (R2 + R4)

I had been asked this question by my school principal while I was bunking the class.

I need to ask this question from Difference Amplifiers in section Operational Amplifiers of Electronic Devices & Circuits

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The correct answer is (c) (R1 + R2) || (R3 + R4)

Explanation: Parallel combination of series combination of R1 & R3 with the series combination of R3 and R4 is the required answer as is visible by the circuit.

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