GATE EE 2015 Set 1 — Question 17

MCQ+1 / -0.33EasyIdeal & Non-Ideal Op-AmpOperational AmplifiersAnalog & Digital Electronics

Analog & Digital Electronics → Operational Amplifiers → Ideal & Non-Ideal Op-Amp

Last updated 5 September 2026

Question

Of the four characteristics given below, which are the major requirements for an instrumentation amplifier? P. High common mode rejection ratio Q. High input impedance R. High linearity S. High output impedance

Correct answer (A) P, Q and R only Solution An instrumentation amplifier is designed to amplify very small differential signals while rejecting large common-mode signals. Its key requirements are: 1. High Common Mode Rejection Ratio (CMRR) (P): To reject noise common to both inputs. 2. High Input Impedance (Q): To prevent loading of the signal source. 3. High Linearity (R): To ensure the output is a faithful reproduction of the input. 4. Low Output Impedance : To drive subsequent stages without signal loss. (Characteristic S, high output impedance, is incorrect). Therefore, P, Q, and R are the major requirements. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (A) P, Q and R only Solution An instrumentation amplifier is designed to amplify very small differential signals while rejecting large common-mode signals. Its key requirements are: 1. High Common Mode Rejection Ratio (CMRR) (P): To reject noise common to both inputs. 2. High Input Impedance (Q): To prevent loading of the signal source. 3. High Linearity (R): To ensure the output is a faithful reproduction of the input. 4. Low Output Impedance : To drive subsequent stages without signal loss. (Characteristic S, high output impedance, is incorrect). Therefore, P, Q, and R are the major requirements.

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