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1. Derive expressions for the differential and common mode gains of the amplifier and thence derive...

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Electrical Engineering

1. Derive expressions for the differential and common mode gainsof the amplifier and thence derive the common mode rejection ratio(CMRR). Explain the design steps necessary to achieve a highCMRR.

2. If the differential gain of the first stage of the amplifieris 100 and the -& resistor values associated with the secondstage are R1= 15k, R2= 10.5k, R3= 200k and R4= 101k, calculate theCMRR of the whole system.

3. Explain the operation of a Lock – in amplifier system ofwhich the output is independent of the phase of the measurand.

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