For an op-amp having differential gain Av and common-mode gain Ac the CMRR is given by___________?
Correct answer: B. Av / Ac
- A. Av + Ac
- B. Av / Ac
- C. 1 + Av / AC.
- D. Ac / Av
Explanation
CMRR compares differential gain with common-mode gain, so CMRR = Av/Ac, often expressed in decibels as 20 log10(Av/Ac). The reciprocal Ac/Av would represent common-mode rejection relative to differential gain, not CMRR.
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