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Electronic Devices & CircuitsOperational Amplifiers

An op-amp has CMRR = 80 dB and differential gain Ad = 100000. Its common-mode gain Acm is approximately?

  • A0.1
  • B1
  • C10
  • D100
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Correct Answer: C. 10
Explanation: 80 dB means Ad/Acm = 10^(80/20) = 10000. Therefore Acm = 100000/10000 = 10.
Reference: Standard analog electronics: CMRR calculation
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