GATE EC 2014 Set 1 — Question 19
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Question
In the figure, assume that the forward voltage drops of the PN diode and Schottky diode are and , respectively. If ON denotes conducting state of the diode and OFF denotes non-conducting state of the diode, then in the circuit,
Correct answer
(D) D₁ is OFF and D₂ is ON
Solution
Let be the voltage at the node between the resistor and the parallel branches.
Assume is ON. Then .
The total current from the source is .
If is OFF, then .
.
For to be ON, the voltage must be at least . Since , is indeed OFF.
Since , is forward biased and ON.
Therefore, is OFF and is ON.
Assume is ON. Then .
The total current from the source is .
If is OFF, then .
.
For to be ON, the voltage must be at least . Since , is indeed OFF.
Since , is forward biased and ON.
Therefore, is OFF and is ON.
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