GATE EE 2014 Set 3 — Question 60
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Analog & Digital Electronics → Diode Circuits → Clipping & Clamping
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Question
The transfer characteristic of the Op-amp circuit shown in figure is
Correct answer
(C) [figure]
Solution
The first op-amp with its two diodes is a precision half-wave rectifier; the second op-amp is an inverting amplifier with gain . Let be the voltage at the junction of the series diode and the feedback resistor (input of the second stage).Case 1: . The first op-amp output swings negative. The diode connected directly between the inverting input and the output conducts and closes the loop, holding the inverting input at virtual ground, while the series output diode is reverse biased. No current flows in the feedback resistor , so andCase 2: . The first op-amp output swings positive. The series diode conducts and the direct feedback diode is reverse biased, so the first stage is an inverting amplifier with gain :The second stage inverts again:So the transfer characteristic is (slope ) for and for , which is the graph in option (C).Answer: (C)
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