Tunnel Diode

Tunnel Diode- Introduction, Definition, Circuit diagram, Process, VI characteristics, advantages, Disadvantages and Application

1. TUNNEL DIODE

2. Contents

3. A  tunnel  diode   or  Esaki diode  is a type of  semiconductor  that is capable of very fast operation, well into the  microwave   frequency region, made possible by the use of the  quantum mechanical effect called tunneling. The tunnel diode s basically a pn junction with heavy doping of p type and n type semiconductor materials It was invented in August 1958 by Leo Esaki when he was with Tokyo Tsushin Kogyo, now known as Sony. In 1973 he received the Nobel Prize in Physics , Introduction

4. Tunnel diode is the p-n junction device that exhibits negative resistance. That means when the voltage is increased the current through it decreases. Definition

5. Circuit symbol The tunnel diode is a two terminal device with p type semiconductor acting as anode and n type semiconductor as cathode. The circuit symbol of tunnel diode is shown

6. Process

7. V-I characteristics

8. Advantages of tunnel diode  1. High speed of operation due to the fact that the tunneling takes place at the speed of light. 2. Low cost 3. Low noise 4. Environmental immunity 5. Low power dissipation 6. Simplicity in fabrication 7. Longevity

9. Disadvantages of tunnel diode 1. Low output voltage swing 2. Because it is a two terminal device, there is no isolation between input and output . Applications of tunnel diode 1. Tunnel diodes are used as very high speed switches 2.  Used as high frequency micro wave oscillator

10. Thank you Made By: Anita Malviya