GATE EE 2020 Set 1 — Question 41
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Analog & Digital Electronics → Diode Circuits → P-N Junction Diode
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Question
A non-ideal diode is biased with a voltage of V, and a diode current of is measured. The thermal voltage is mV and the ideality factor for the diode is . The voltage, in V, at which the measured current increases to is closest to:
Correct answer
(B) -0.09
Solution
The diode current equation is .
Given:
V
mV V
So, V.For the first case:
For the second case, we want :
Using the diode equation for :
Taking natural log on both sides:
VThe closest value is V.
Given:
V
mV V
So, V.For the first case:
For the second case, we want :
Using the diode equation for :
Taking natural log on both sides:
VThe closest value is V.
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