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In constant voltage drop diode in reverse bias is considered as a ___________

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In constant voltage drop diode in reverse bias is considered as a ___________

(a) Resistor

(b) Perfect conductor

(c) Perfect insulator

(d) Capacitor

The question was asked during an interview.

The doubt is from Constant Voltage Drop Model-1 in portion Diode Circuit of Analog Circuits

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Best answer
Correct option is (c) Perfect insulator

Easiest explanation: In constant voltage drop the diode is considered as a perfect conductor in forward bias and perfect insulator in reverse bias. That is voltage drop at forward bias is zero and current through the diode at reverse bias is zero. In this model at forward bias diode can be replaced as a cell and in reverse bias diode can be avoided by considering the terminals are open.

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