The semiconductor diode which can be used in switching circuits at mic

1.	The semiconductor diode which can be used in switching circuits at microwave range is:
A.	PIN diode
B.	Tunnel diode
C.	Varactor diode
D.	Gunn diode
Answer» B. Tunnel diode

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A varactor diode may be useful at microwave frequencies (indicate the false answer):

The semiconductor diode which can be used in switching circuits at microwave range is:

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