If a zener diode is made from heavily doped semiconductors, its depletion region becomes very narrow and the structure becomes: 

This question was previously asked in
KVS TGT WET (Work Experience Teacher) Official Paper
View all KVS TGT Papers >
  1. Varactor diode
  2. PIN diode
  3. Schottky diode
  4. Tunnel diode

Answer (Detailed Solution Below)

Option 4 : Tunnel diode
Free
KVS TGT Mathematics Mini Mock Test
11.5 K Users
70 Questions 70 Marks 70 Mins

Detailed Solution

Download Solution PDF

When a Zener diode is made from heavily doped semiconductors, its depletion region will be very narrow very and the structure becomes a Tunnel Diode.

Tunnel Diode:

  • Symbol:

Electronics Janesh Assignment 4 9Q S shubham D4

  • It is a highly doped PN Junction diode, used for low voltage high-frequency switching applications.
  • It works on the tunneling principle.
  • It has a high charge carrier velocity.
  • When compared to a normal p-n junction diode, the tunnel diode has a narrow depletion width.
  • In normal forward-biased operation, it exhibits the “Negative resistance region” as shown:

Electronics Janesh Assignment 4 9Q S shubham D5

  • The negative differential resistance in their operation, allows them to be used as oscillators, amplifiers, and switching circuits.
  • Their low capacitance allows them to function at microwave frequencies.
  • Microwave frequencies range between 109 Hz (1 GHz) to 1000 GHz
  • Tunnel diodes are not good rectifiers, as they have relatively high leakage current when reverse biased.
Latest KVS TGT Updates

Last updated on May 8, 2025

-> The KVS TGT Notiifcation 2025 will be released for 16661 vacancies.

-> The application dates will be announced along with the official notification.

-> Graduates with B.Ed or an equivalent qualification are eligible for this post.

-> Prepare with the KVS TGT Previous Year Papers here.

Get Free Access Now
Hot Links: teen patti lucky teen patti master mpl teen patti teen patti baaz teen patti comfun card online