GATE EC 2022 Set 1 — Question 41
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Analog Circuits → Op-Amp Circuits → Schmitt Trigger & Comparators
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Question
For the following circuit with an ideal OPAMP, the difference between the maximum and the minimum values of the capacitor voltage () is __________.
Correct answer
(C) 13 V
Solution
The OPAMP with positive feedback to the non-inverting input acts as a Schmitt trigger; the capacitor (on the inverting input) charges/discharges through between the two thresholds. Since the OPAMP is ideal, switches between the rails V and V. The diode I-V curve shows ideal diodes (0 V drop when ON, open when reverse biased).The non-inverting node connects to ground through in series with (), and to through in series with (). (left) conducts when current flows from the node toward ground; (right) conducts when current flows from the node toward the output. V: current flows output node ground. ON (left arm ), OFF (right arm ): V: current flows ground node output. OFF (left arm ), ON (right arm ):The capacitor voltage swings between V and V, so(27 V is the rail-to-rail swing; 15 V and 14 V do not follow from the circuit.)Answer: (C) 13 V
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