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Answer Posted / nidhi ahmed
The common-mode rejection ratio of a differential amplifier
(or other device) measures the tendency of the device to
reject input signals common to both input. A high CMRR is
important in applications where the signal of interest is
represented by a small voltage fluctuation superimposed on a
voltage offset, or when relevant information is contained in
the voltage difference between two signals. (example-audio
transmission over balanced lines.)
The CMRR is a very important specification, as it indicates
how much of the common-mode signal will appear in your
measurement. The value of the CMRR often depends on signal
frequency.
CMRR is often important in reducing noise on transmission
lines.The CMRR of the measurement instrument determines the
attenuation applied to the offset or noise.
Mathematically,
"It is the ratio b/w diffferitial gain to common mode gain"
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