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If for an amplifier v1 and v2 are the input signals, vc and vd represent the common mode and differential signals respectively, then the expression for CMRR (Common Mode Rejection Ratio) is

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If for an amplifier v1 and v2 are the input signals, vc and vd represent the common mode and differential signals respectively, then the expression for CMRR (Common Mode Rejection Ratio) is

(a) 20 log (|Ad| / |Ac|)

(b) -10 log (|Ac| / |Ad|)^2

(c) 20 log (v2 – v1 / 0.5(v2 + v1))

(d) All of the mentioned

The question was posed to me in an international level competition.

The query is from Difference Amplifiers in chapter Operational Amplifiers of Electronic Devices & Circuits

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Correct answer is (d) All of the mentioned

The best I can explain: Note that all the expressions are identical.

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