Explain about Common-Mode Rejection Ration ?

• CMRR is used for measuring the tendency of the device that is to reject the input signals.

• These signals can be from both input leads.

• CMRR at a high level is important, as the signals of interest are represented by a small set of fluctuations of voltage.

• The voltage fluctuations are superimposed on, possibly a large voltage offset.

• Superimposition of the signals might also be done, when the information of relevance is contained in the voltage difference between the two signals.