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If for an amplifier the common mode input signal is vc, the differential signal id vd and Ac and Ad represent common mode gain and differential gain respectively, then the output voltage v0 is given by

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If for an amplifier the common mode input signal is vc, the differential signal id vd and Ac and Ad represent common mode gain and differential gain respectively, then the output voltage v0 is given by

(a) v0 =  Ad vd – Ac vc

(b) v0 =  – Ad vd + Ac vc

(c) v0 =  Ad vd + Ac vc

(d) v0 = – Ad vd – Ac vc

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Question is from Difference Amplifiers topic in chapter Operational Amplifiers of Electronic Devices & Circuits

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Correct answer is (c) v0 =  Ad vd + Ac vc

To explain: It is a standard mathematical expression.

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