GATE EC 2015 Set 2 — Question 21
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Analog Circuits → Diode Circuits → Clamping Circuits
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Question
If the circuit shown has to function as a clamping circuit, then which one of the following conditions should be satisfied for the sinusoidal signal of period ?
Correct answer
(D) RC T
Solution
For a clamping circuit to operate correctly, the capacitor must maintain its charge during the period when the diode is not conducting. This requires the discharge time constant to be much larger than the period of the input signal. If is small, the capacitor would discharge significantly, failing to provide the required DC shift. Thus, the condition must be satisfied.
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