Answer / aravind

CMRR is defined as the ratio of differential voltage gain,Ad to the common mode voltage gain,Acm

CMRR = Ad/Acm

Answer / narendra kumar

CMRR (common mode rejection ratio)is nothing but it is the
tendancy to rejects the input common between two input
terminals.
it is the ratio of power in diffrential mode over
common mode CMRR=(Adm/Acm)2
or 20 log(Adm/Acm)

Answer / upchar kumar kurmi

cmrr stands for common mode rejection ratio and it is ratio
of defferential mode gain to common mode gain.The value for
cmrr is ideally infinity. It is used to reject interference
b/w both of measurement terminals of any instrument(like
opamp).It means it is reduces nopise.

cmrr=Ad/Ac;
cmrr=log[base10(Ad/Ac)];

Answer / raj

it is the measure of how good is your opamp to kickoff the
common mode devil called noise as the noise happens to be
the commom mode signal.To do so in the first stage of an
opamp,the differential amplifier is designed properly to
decrease common mode gain ,hense improving CMRR.
HOW?...emitter resistor replaced with current mirror

Answer / guest

it is a common mode rejection ration

Answer / puneet

CMMR is abbreviated as common mode rejection ratio.It
rejects the common voltage basically noise when an op-amp is
working in common mode having common input terminals.
For an ideal op-amp CMRR should be infinite.It is measured
in decibels.
CMRR=Ac/AD
where,
Ac=gain in common mode configuration
Ad=gain in differential mode

Answer / jaffer and boobalan

it is defined as the ratio of common mode gain and
differential mode gain

CMRR = Ac/Ad

Answer / vinoth

common mode rejection ratio .
the ratio between common mode to differns mode

Answer / minu priya

CMRR is abbrevated as common mode rejetion ratio . It
is denoted as rho (p) .
the CMRR for any device should be less.

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