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
Let's analyze the circuit:
1.The first op-amp has at its non-inverting terminal ().
2.The output of the first op-amp is connected to the non-inverting terminal of the second op-amp.
3.The second op-amp is in a voltage follower (buffer) configuration, so its output is equal to its non-inverting input.
4.The final output is fed back to the inverting terminal of the first op-amp ().
5.For an ideal op-amp with negative feedback, . Therefore, .
Since the output voltage is equal to the input voltage with unity gain and high input impedance, the circuit represents a buffer.Continue learning with Success Tracker
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