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Microwave Communication - Engineering

Q1:

The reverse voltage applied to a varactor diode

A is less than avalanche breakdown voltage

B is more than avalanche breakdown voltage

C may be more or less than a avalanche breakdown voltage

D is very high as compared to avalanche breakdown voltage

ANS:A - is less than avalanche breakdown voltage

The action of varactor diode is due to the capacitance of depletion layer. The thickness of depletion layer depends on the reverse bias which should not cause breakdown.