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Asked Oct 26, 2019
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An opamp is having a differential gain Ad =4500 and a common mode gain Ac = 25. What will be value of Common Mode Rejection Ratio (CMRR)? Express your answer in decibels (dB).

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Step 1

For an Op-amp, common mode rejection ratio (CMRR) is defined as the ratio of the magnitude of the differential gain to the magnitude of the common mode gain. It can be expressed in the following way: 

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CMRR > (1) A |L A = Differential Gain Ac = Common Mode Gain

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Step 2

So, in this case, value of CMRR will be 

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4500 CMRR 180->(2) 25

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Step 3

When expressed in decibels (dB), ...

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A CMRR = 20log10 dB Ac

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