Question

3) In a Zener diode with high breakdown voltage

a)Both P and N are heavily doped

b) Both P and N are lightly doped

c) Either P or N is lightly doped

d)None of the above​

Answer 1

Answer:

B

Explanation:

Breakdown voltage for commonly available Zener diodes can vary widely from 1.2 V to 200 V. For diodes that are lightly doped the breakdown is dominated by the avalanche effect rather than the Zener effect

Answer 2

In a Zener diode with high breakdown voltage (b) Both P and N are lightly doped.

Zener diode is a special type of diode that allows the current to flow in a backward direction. When the voltage reaches a certain voltage, known as the breakdown voltage, the current starts flowing in the opposite direction.

A Zener diode with a high breakdown voltage experiences an Avalanche breakdown. In the Avalanche breakdown, high voltage is applied across the ends of the diode. There is sufficient energy to liberate the free electrons in the diode. These electrons cause an electric current to flow in a direction opposite to the previous direction of the current. For an Avalanche breakdown to occur, both the P and N ends of the diode are lightly doped.