GATE EC 2016 Set 2 — Question 23
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Analog Circuits → Diode Circuits
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Question
Assume that the diode in the figure has , but is otherwise ideal.
The magnitude of the current (in mA) is equal to ________

Correct answer
0.25 to 0.25
Solution
To determine if the diode is ON or OFF, we first find the open-circuit voltage across it. Assuming the diode is an open circuit, the circuit is a simple voltage divider with and in series with a source. The voltage across (where the diode is connected in parallel) is:
.
Since the required turn-on voltage is greater than , the diode remains OFF. With the diode OFF, the current is simply the current in the series circuit:
.
.
Since the required turn-on voltage is greater than , the diode remains OFF. With the diode OFF, the current is simply the current in the series circuit:
.
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