The GATE Grind

GATE 2025 EC – Question 29

Analog Circuits · Op-amp Circuits · 1 mark · Multiple select

Which of the following statements is/are TRUE with respect to an ideal opamp?

  1. It has an infinite input resistance
  2. It has an infinite output resistance
  3. It has an infinite open-loop differential gain
  4. It has an infinite open-loop common-mode gain

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Show answer and explanation

Correct answer: (A) It has an infinite input resistance; (C) It has an infinite open-loop differential gain

Explanation

An ideal op-amp has infinite input resistance, zero output resistance, infinite open-loop differential gain and zero common-mode gain (infinite CMRR). So A and C are true; B and D are false.