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Electronic Devices & CircuitsOperational Amplifiers

An op-amp has differential gain Ad = 100000 and common-mode gain Acm = 1. Its CMRR in decibels is?

  • A20 dB
  • B40 dB
  • C80 dB
  • D100 dB
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Correct Answer: D. 100 dB
Explanation: CMRR = Ad/Acm = 100000. In dB, 20 log10(100000) = 100 dB.
Reference: Standard analog electronics: CMRR calculation
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