GATE EC 2020 Set 1 — Question 18
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Analog Circuits → Op-Amp Circuits → Schmitt Trigger & Comparators
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Question
The components in the circuit shown below are ideal. If the op-amp is in positive feedback and the input voltage is a sine wave of amplitude 1 V, the output voltage is
Correct answer
(D) a constant of either +5 V or -5 V.
Solution
When an op-amp is operated in a positive feedback configuration, it acts as a comparator with hysteresis or simply saturates to its supply rails. Because the feedback is positive, any small difference at the input is amplified until the output reaches one of the saturation limits ( or ). Given the supply voltages are V, the output will be a constant value of either V or V depending on the initial state and input conditions.
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