Answer / sathish

cmrr is the ability of a op amp to reject the common mode
signals when it is operating in diff mode .

Answer / dfsgf

Some times we applied same input at the terminals of op-
amp. for example 2,2+sinwt then op-amp should reject common
input component ,i.e 2 and amplyfies sinwt
that is CMMR

Answer / s mishra

CMRR is the ratio of differential gain (Av) to common mode
gain (Acm) in a differential amplifier. Av=Vo/V1 - V2.
Acm=Vo/Vcm where Vcm=V1=V2.
Putting these values for CMRR,

CMRR=Av/Acm=Vcm/V1-V2
=V1/V1-V2
=V2/V1-V2
Now, V1-V2=Vcm/CMRR
For an ideal differential amplifier, CMRR=Infinite
Hence V1-V2=0 Or, V1 and V2 are almost at same potential.

If this is clear, please send feedbak to gula033@gmail.com

Answer / shr

it is the ratio between differential gain and common mode
gain. The op amp with high cmrr is the best in order to use...

Answer / raushan saxena

THE Efficacy of a differential amplifier is measured by the
degree of its rejection of common-mode signals in preference
to differential signals which is usually quantified by a
measure known as the common-mode rejection ratio.

CMRR =20log|Ad|/|Ac|

Answer / k m c sekhar reddy

CMRR is the common mode rejection ratio. it is between
differential mode and common mode of the amplifier gain

Answer / shovik maitra

it is ratio of differential gain and common mode voltage gain.common mode voltage gain is ideally 0 and thus cmrr is ideally infinity

Answer / saurav kumar

CMRR stand for common mode rejection ratio.The relative sensitivity of op-amp to difference signal compared to a comman mode signal is called common mode rejection ratio .
CMRR=AD/AC
Where ad=differencil voltage gain
ac=common mode voltage gain...

Answer / pats

The common-mode rejection ratio (CMRR) of a differential amplifier (or other device) is the tendency of the devices to reject the input signals common to both input leads. A high CMRR is important in applications where the signal of interest is represented by a small voltage fluctuation superimposed on a (possibly large) voltage offset, or when relevant information is contained in the voltage difference between two signals.

Answer / david raj

cmrr is the common mode rejection ratio.it rejects the common
mode signal and the noise is reduced.cmrr=20log(ad/ac). it is
a differential amplifier.

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