Common-Mode Rejection Ratio (CMRR)

Posted By on September 19, 2014


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Expression of op-amp for non-inverting closed loop voltage gain(AVF)
3 Terminal IC based Voltage Regulator

The common-mode rejection ratio (CMRR) of a differential input indicates the capability of the input to reject input signals common to both input leads. A high CMRR is important when the signal of interest is a small voltage fluctuation superimposed on a (large) voltage offset. It is also important when relevant information is contained in the voltage difference between two signals, like audio transmission over balanced lines or serial communication like USB and CAN bus.

The CMRR is defined as the ratio of the differential gain Ad over the common-mode gain Acm:

CMRR formula

The CMRR is given in decibels (dB) and the higher the CMRR value is, the better.

Expression of op-amp for non-inverting closed loop voltage gain(AVF)
3 Terminal IC based Voltage Regulator

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Posted by Akash Kurup

Founder and C.E.O, World4Engineers Educationist and Entrepreneur by passion. Orator and blogger by hobby

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