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CMRR -  Common mode rejection ratio. It is the ration of common mode gain to differencial mode gain. or it measures the ability of the device to reject common mode signals.

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CMRR is a ratio between the differential gain to the common mode gain. This qauntifies the quality of a amplier. More the value the better is the differential amplifier. Ideal Differential amplifier has Infinite CMRR but in practical case it will around 80dB. 

CMRR physically interprets how better the amplifier amplifies the difference in input signal over the common part of the input signals

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CMRR is defined as the ratio of diffrential gain to the common mode gain.the ideal value of CMRR is to be INFINITY.means commom mode tends to ZERO.

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Common Mode Rejection Ratio; Its the ability of the amplifier to reject common mode signals(noise) compared to the ability to the differential signals

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common mode rejection ratio

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• One important measure of the goodness of an opamp or an opamp circuit is the common mode rejection ratio (CMRR)

• The common-mode rejection ratio (CMRR) of a differential amplifier (or other device) is the measure of rejection by the device of unwanted input signals common to both input leads, relative to the wanted difference signal.
• An ideal differential amplifier would have infinite CMRR; this is not achievable in practice.
• A high CMRR is required when a differential signal must be amplified in the presence of a possibly large common-mode input. An example is audio transmission over balanced lines.

• Ideally, opamps are expected to amplify the differences between v1 and v2 with nearly infinite gain 

• Due to transistor nonidealities, some small amount of amplification occurs due to the common signal of both inputs

• A typical CMRR is 80-100dB at low frequency

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CMRR(common mode rejection ratio) is the term usually used in Amplifiers. It is defined as the powers of the differential gain over the common-mode gain.

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Common mode rejection ratio

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Common Mode Rejection Ratio (CMRR)  is defined as the measure of rejection by the device of unwanted input signals common to both input leads.

An Ideal Differential amplifier have infinite CMRR.

CMRR isdefined as the ratio of powers of the differential gain over the common mode gain in decibels

               CMRR=20 log 10(Ad/Am)db

The value of CMRR is depend upon the signal Frequency.

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The common-mode rejection ratio (CMRR) of a differential amplifier (or other device) is the measure of rejection by the device of unwanted input signals common to both input leads, relative to the wanted difference signal. An ideal differential amplifier would have infinite CMRR; this is not achievable in practice. A high CMRR is required when a differential signal must be amplified in the presence of a possibly large common-mode input

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cmrr means commmon mode rejection ratio.. it is ratio of  differential mode divided by ratio of common mode.   

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If a signal is applied equally to both inputs of an op amp, so that the differential input voltage is unaffected, the output should not be affected.The op amp common-mode rejection ratio (CMRR) is the ratio of the common-mode gain to differential-mode gain.

 But in practice, changes in common mode voltage will produce changes in output

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Common mode rejection ratio. It is the ratio between differential mode gain to the common mode gain.