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Question
What is CMRR? Explain briefly.
 Question Submitted By :: Electronics-Communications
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
cmrr means commmon mode rejection ratio.. it is ratio of
differential mode divided by ratio of common mode.
 
Is This Answer Correct ?    219 Yes 32 No
Sureshkumar
 
Answer
# 2
CMRR stands for common mode rejection ratio. It is a
measure of the ability of a test instrument to reject
interference that is common to both of its measurement
input terminals. It is expressed in decibels and it is the
ratio of the actual or common signal level appearing on the
two input terminals together to the measured level.
 
Is This Answer Correct ?    115 Yes 10 No
Raveesh83
 
 
 
Answer
# 3
CMMR=[AD/AC]
AD= differential gain of the amplifire.
AC= common mode gain of the amplifire.
IN decibel
CMMR(log)=20log[base10](ad/ac)
 
Is This Answer Correct ?    72 Yes 9 No
Mani Bhushan
 
Answer
# 4
CMRR whichis defined as the ability to reject the common
gain.it is also defined as the ratio between the
differential mode gain to the common mode gain.
 
Is This Answer Correct ?    70 Yes 13 No
Nithya.
 
Answer
# 5
The common-mode rejection ratio (CMRR) of a differential
amplifier measures the tendency of the device to reject
input signals common to both input leads. CMRR is often
important in reducing noise on transmission lines
 
Is This Answer Correct ?    49 Yes 11 No
Abhishek Kumar
 
Answer
# 6
it is the ability of op amp to reject the common mode
signals while its working in diffrential mode.
cmrr=ad/ac
 
Is This Answer Correct ?    38 Yes 8 No
Sathish
 
Answer
# 7
it is common mode rejection ratio.it is a ratio between
diffrential mode gain and common mode gain
 
Is This Answer Correct ?    37 Yes 7 No
Gowri
 
Answer
# 8
CMMR is abbreviated as common mode rejection ratio.
it means cmmr of an amplifier tells the ablility to
amplify the differance signal more than the common signal
at the input of the two terminal of the amplifier.
so high value of cmmr is required ideally infinity. it
means the reduction of noise at the input.

CMMR=[AD/AC]
AD= differential gain of the amplifire.
AC= common mode gain of the amplifire.
IN decibel
CMMR(log)=20log[base10](ad/ac)
 
Is This Answer Correct ?    25 Yes 1 No
Adesh Bandhu
 
Answer
# 9
ideally the two input terminals must be identical but
practically it is often not possible but effort is put to
make them as identical as possible, that's where cmrr
comes into picture. its ratio of
differential gain of the amplifier
and
common mode gain of the amplifier.
if input are almost identical then common mode gain must be
almost zero, in other words cmrr is infinity....
 
Is This Answer Correct ?    13 Yes 3 No
Louis
 
Answer
# 10
CMRR means common mode rejection ratio is the ratio of
diffrential gain to the common mode gain.
CMRR = Ad/Acm
where Ad = diffrential gain
Acm= common mode gain
its ideal value is infinite.
For high gain of opamp it should be infinite.
CMRR is represent in decibel.
decibel = 20log(Ad/Acm)
 
Is This Answer Correct ?    11 Yes 1 No
Raman Chauhan
 

 
 
 
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