GATE EC 2015 Set 1 — Question 21
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Analog Circuits → Diode Circuits → HW, FW & Bridge Rectifiers
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Question
For the circuit with ideal diodes shown in the figure, the shape of the output () for the given sine wave input () will be
Correct answer
(C) [figure]
Solution
Analysis of the circuit for both half-cycles of the input sine wave :
1.Positive Half-Cycle (): The top terminal is positive and the bottom terminal is negative.
- The top diode (anode at top terminal) is forward-biased.
- The bottom diode (cathode at top terminal, anode at output) is also forward-biased as it completes the circuit loop through the resistor back to the bottom terminal.
- Path: Top terminal Diode 1 Resistor Diode 2 Bottom terminal.
- Both diodes are ON. The output across the resistor follows (assuming ideal diodes).
- Both diodes are reverse-biased.
- No current flows through the resistor, so .
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