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What is CMRR? Explain briefly.
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Answer Posted / 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
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