GATE EE 2025 Set 1 — Question 17
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Analog & Digital Electronics → Operational Amplifiers → Summing & Difference
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Question
Assuming ideal op-amps, the circuit represents a
Correct answer
(D) buffer.
Solution
Label the bottom op-amp as A1 and the top op-amp as A2.
1.A1: its non-inverting input is , so . Its output is the node .
2.A2: its non-inverting input is connected to , and its output is tied directly to its own inverting input. This is a voltage follower, so for an ideal op-amp
3.The output of A2 is also wired to the inverting input of A1, so
4.The loop A1 → A2 → inverting input of A1 is negative feedback, so the ideal op-amp A1 forces :
The output follows the input with unity gain, and the input drives only the (ideal, infinite-impedance) non-inverting terminal of A1. No resistors are present, so there is no summing, differencing or logarithmic action.The circuit is a buffer, option (D).Continue learning with Success Tracker
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