# 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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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: help_outlineImage TranscriptioncloseCMRR > (1) A |L A = Differential Gain Ac = Common Mode Gain fullscreen
Step 2

So, in this case, value of CMRR will be

Step 3

When expressed in decibels (dB), ...

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### Electrical Engineering 