Question
If an op amp is a factor of 1000 more responsive to differential mode signals than common mode signals, what is the op amp's common mode rejection ratio, CMRR, expressed in decibels?
Step 1
CMRR is a measure of how well an operational amplifier (op amp) can reject common mode signals compared to differential mode signals. It is defined as the ratio of the differential gain (Ad) to the common mode gain (Ac). Show more…
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An OP-AMP has a common mode gain of 0.01 and a differential mode gain of 105. Its common mode rejection ratio would be ?
In a certain instrumentation amplifier, the input signal consists of a $20-\mathrm{mV}-\mathrm{rms}$ differential signal and a $5 . \mathrm{V}$ -rms $60-\mathrm{Hz}$ interfering common-mode signal. It is desired that the common-mode contribution to the output signal be at least $60 \mathrm{dB}$ lower than the contribution from the differential signal. What is the minimum CMRR allowed for the amplifier in decibels?
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