GATE EE 2024 Set 1 — Question 61
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Analog & Digital Electronics → Operational Amplifiers → Op-Amp Non-Idealities
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Question
A difference amplifier is shown in the figure. Assume the op-amp to be ideal. The CMRR (in dB) of the difference amplifier is _________ (rounded off to 2 decimal places).
Correct answer
39.5 to 41.5
Solution
Let (input to the inverting terminal), (feedback), (input to the non-inverting terminal) and (non-inverting terminal to ground).By superposition for an ideal op-amp:Write the inputs in terms of the differential voltage and the common-mode voltage , i.e. , :(The common-mode gain is a small difference of two nearly equal numbers, so keep several significant figures here; rounding to shifts the answer in the second decimal place.)Answer: dB
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