GATE EC 2025 Set 1 — Question 29
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Analog Circuits → Op-Amp Circuits → Ideal & Non-Ideal Op-Amp
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Question
Which of the following statements is/are TRUE with respect to an ideal opamp?
Correct answer
(A) It has an infinite input resistance; (C) It has an infinite open-loop differential gain
Solution
An ideal operational amplifier (opamp) has the following characteristics:
1.Infinite input resistance (): No current enters the input terminals. (Statement A is TRUE)
2.Zero output resistance (): The output voltage is independent of the load. (Statement B is FALSE)
3.Infinite open-loop differential gain (): A very small differential input results in a large output. (Statement C is TRUE)
4.Zero open-loop common-mode gain (): It perfectly rejects common-mode signals. This implies an infinite Common Mode Rejection Ratio (). (Statement D is FALSE)
Hence, options (A) and (C) are correct.Continue learning with Success Tracker
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