The GATE Grind

GATE 2015 EE – Question 17

Analog and Digital Electronics · Operational amplifiers: characteristics and applications · 1 mark · Multiple choice

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

  1. P, Q and R only
  2. P and R only
  3. P, Q and S only
  4. Q, R and S only

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Correct answer: (A) P, Q and R only

Explanation

An instrumentation amplifier amplifies a small difference signal in the presence of large common-mode noise, so it needs a high common-mode rejection ratio, a high input impedance so it does not load the source, and high linearity. A high output impedance is not wanted.