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Definition of "Common Mode Rejection Ratio" |
CMRR of a differential amplifier or other device is the 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. / Negative feedback occurs when the result of a process influences the operation of the process itself in such a way as to reduce changes. Negative feedback tends to make a system self-regulating; it can produce stability and reduce the effect of fluctuations. Negative feedback loops in which just the right amount of correction is applied in the most timely manner can be very stable, accurate, and responsive. |
Definition of "Common-Mode Rejection Ratio" |
[CMRR] The ratio of the common-mode interference voltage at the input of a circuit, to the corresponding interference voltage at the output. See one possible CMRR adjustment circuit to the right. The ratio of the common-mode input voltage to the output voltage, in dB. The ratio of the differential voltage amplification to the common-mode voltage amplification. |
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