Draw the symbols of following diodes:

i) Varactor diode,

ii) Schottky diode,

iii) p-i-n diode

iv) Tunnel diode

Explain the origin of negative resistance in Gunn diode with the help of appropriate E-k diagram. What are the applications of Gunn diode?

1. Symbols of Diodes:

i) Varactor diode:  
A varactor diode is represented as a symbol with a triangle pointing towards a vertical line, with two opposite arcs (representing the junction) placed near the triangle on both sides, and a reverse polarity marking on the junction.

ii) Schottky diode:  
The Schottky diode symbol looks like a standard diode symbol but with a "metal-semiconductor" junction, which _________ ____ _______ ______ ___ ________ ______ _______ ___.
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