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Express the input voltages v1 and v2 in terms of differential input (vd) and common-mode input(vc). Given v2 > v2.

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Express the input voltages v1 and v2 in terms of differential input (vd) and common-mode input(vc). Given v2 > v2.

(a) Vd = V1 – V2, Vc = 0.5(V1 + V2)

(b) Vd = V2 – V1, Vc = V1 + V2

(c) Vd = V1 – V2, Vc = V1 + V2

(d) Vd = V2 – V1, Vc = 0.5(V1 + V2)

The question was posed to me by my college director while I was bunking the class.

My question is taken from The Ideal Operational Amplifiers in portion Operational Amplifiers of Electronic Devices & Circuits

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Best answer
Correct choice is (d) Vd = V2 – V1, Vc = 0.5(V1 + V2)

The best I can explain: This is the correct mathematical representation.

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