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What is a differential amplifier? Also, explain CMRR.
Differential Amplifier : The amplifier, which is used to amplify the voltage difference between two input-lines neither of which is grounded, is called differential amplifier.
This reduces the amount of noise injected into the amplifier, because any noise appearing simultaneously on both the input-terminals as the amplifying circuitry rejects it being a common mode signal.
CMRR : It can be defined as the ratio of differential voltage-gain to common made voltage gain.
If a differential amplifier is perfect, CMRR would be infinite because in that case common mode voltage gain would be zero.
This reduces the amount of noise injected into the amplifier, because any noise appearing simultaneously on both the input-terminals as the amplifying circuitry rejects it being a common mode signal.
CMRR : It can be defined as the ratio of differential voltage-gain to common made voltage gain.
If a differential amplifier is perfect, CMRR would be infinite because in that case common mode voltage gain would be zero.