Which of the following is the requirement of a good instrumentation amplifier?

Question

Question

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RRB JE CBT 2 (Electronics Engineering) ReExam Official Paper (Held On: 04 Jun, 2025)

Answer 1

The requirement of a good instrumentation amplifier is that it should provide a finite gain.

Explanation:

Low CMRR (Common Mode Rejection Ratio): This is incorrect. A good instrumentation amplifier requires a high CMRR. A high CMRR allows the amplifier to effectively reject common-mode noise and interference while amplifying only the desired differential signal.
Low slew rate: This is generally incorrect. A higher slew rate is desirable for an amplifier to accurately reproduce rapidly changing input signals without distortion. A low slew rate would limit the amplifier's frequency response and ability to handle fast transients.
High power consumption: This is incorrect. In most electronic designs, especially for precision amplifiers, low power consumption is a desirable characteristic, as it reduces heat dissipation and improves efficiency.
Finite gain: This is correct. While instrumentation amplifiers aim for high gain for the differential signal, that gain must be finite and precisely controllable. An amplifier with truly infinite gain would be impractical and unstable. The ability to set a specific, stable, and finite gain (often adjustable) is a key feature that allows instrumentation amplifiers to scale signals accurately.