Question

A differential amplifier is very useful for removing common mode noise voltage that might be fed or induced in the signal cables. Suppose the input signal coming from a signal wire is Vs. Because of potential corruption in the measurement circuit, a common mode noise Vn is induced. In this case, the input voltages at both input wires become Vs Vn at the inverting input and Vn at the non-inverting input. Derive the circuit transfer equation and give the condition for removal of common mode noise.

Answer 1

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