GATE EC 2018 Set 1 — Question 47
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Electronic Devices → P-N Junction & Diodes → Depletion & Diffusion Capacitance
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Question
A dc current of flows through the circuit shown. The diode in the circuit is forward biased and it has an ideality factor of one. At the quiescent point, the diode has a junction capacitance of . Its neutral region resistances can be neglected. Assume that the room temperature thermal equivalent voltage is .
For , the amplitude of the small-signal component of diode current (in , correct to one decimal place) is _______.
Correct answer
6.2 to 6.6
Solution
1.DC Analysis: Given . The dynamic resistance of the diode is .
2.Small Signal Parameters: Junction capacitance . Angular frequency .
3.Diode Small Signal Impedance: .
4.Total Circuit Impedance: The circuit consists of a resistor in series with the diode. .
5.Current Amplitude: The amplitude of the input AC voltage is . The amplitude of the small-signal current is .
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