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
Label the input terminals: top (+) and bottom (−). The top diode has its anode at the top input terminal and its cathode wired (crossing over) to the bottom end of the resistor. The bottom diode has its cathode at the bottom input terminal and its anode wired to the top end of the resistor. (): the top diode is forward biased. Current flows: top terminal → top diode → bottom end of → up through → top end of → bottom diode (forward biased) → bottom terminal. The current flows upward through , so the top of is at the lower potential: , a negative half-sine. (): both diodes are reverse biased, no current flows, so .So the output is a negative half-sine lobe during the first half-period and zero during the second half-period.
- (A) is the input itself and (B) is for the full cycle; neither shows the half-cycle in which no current flows.
- (D) is zero during the first half and positive during the second, which is the wrong half-cycle and the wrong polarity.
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