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Analog ElectronicsDifferential Amplifiers

A differential amplifier has differential gain 1000 and common-mode gain 0.05. Its CMRR in decibels is closest to?

  • A46 dB
  • B66 dB
  • C86 dB
  • D106 dB
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Correct Answer: C. 86 dB
Explanation: CMRR=1000/0.05=20000. Therefore CMRR(dB)=20log10(20000)≈86 dB.
Reference: Standard analog electronics: CMRR numerical
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