gunn diode report for technical seminar pdf

Abstract

A Gunn diode, also known as a transferred electron device (TED), is a form of diode, a two-terminal passive semiconductor electronic component, with negative resistance, used in high-frequency electronics. It is based on the Gunn effect discovered in 1962 by physicist J. B. Gunn. Its largest use is in electronic oscillators to generate microwaves, in applications such as radar speed guns and microwave relay data page link transmitters.

Introduction

Its internal construction is unlike ot ....etc

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Introduction

-What is Gunn Diode?
The Gunn diode is used as local oscillator covering the microwave frequency range of 1 to 100GHz
-How Gunn Diode works?
By means of the transferred electron mechanism, it has the negative resistance characteristic
-What s the applications?
Local Oscillator and Avoid Collision Radar instead of Klystron etc..
-What s the advantages?
Low noise, High frequency operation and Medium RF Power

Gunn Effect

Gunn effect was discovered by J.B Gunn ....etc

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P-N junction diode is the most fundamental and the simplest electronics device. When one side of an intrinsic semiconductor is doped with acceptor i.e, one side is made p-type by doping with n-type material, a p-n junction diode is formed. This is a two terminal device.
The effect described in the previous tutorial is achieved without any external voltage being applied to the actual PN junction resulting in the junction being in a state of equilibrium. However, if we were to make electrical connections at the ends of both the N-type and the P- ....etc

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1. INTRODUCTION
Imagine having a high-definition TV that is 80 inches wide and less than a quarter-inch thick, consumes less power than most TVs on the market today and can be rolled up when you're not using it. What if you could have a heads up display in your car? How about a display monitor built into your clothing? These devices may be possible in the near future with the help of a technology called organic light-emitting diodes (OLEDs). OLED is a flat display technology, made by placing a series of organic t ....etc

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construction and working of impatt diode pdf

Abstract

In many respects, the IMPATT diode structure is very similar to that of many other forms of diode, and in particular the standard PN junction diode or the Schottky diode.However the differences in its construction and fabrication mean that it is able to operate in its avalanche mode whether the transit time provides the negative resistance.
There is a variety of structures that are used for the IMPATT diode. All are variations of a basic PN junction and usually there is an intrinsic layer, ....etc

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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.

It was invented in August 1957 by Leo Esaki when he was with Tokyo Tsushin Kogyo, now known as Sony. In 1973 he received the Nobel Prize in Physics, jointly with Brian Josephson, for discovering the electron tunneling effect used in these diodes. Robert Noyce independently came up with the idea of a tunnel diode while working for ....etc

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The diodes are classified into different types based on their working principles and characteristics. These include Generic diode, Schotty diode, Shockley diode, Constant-current diode, Zener diode, Light emitting diode, Photodiode, Tunnel diode, Varactor, Vacuum tube, Laser diode, PIN diode, Peltier diode, Gunn diode, and so on. On a special case, this article discuss about Gunn diode s working, characteristics and applications.

What is a Gunn Diode?

A Gunn Diode is considered as a type of diode even though it does not contain any typic ....etc

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In electronics, a diode is a two-terminal electronic component that conducts primarily in one direction (asymmetric conductance); it has low (ideally zero) resistance to the flow of current in one direction, and high (ideally infinite) resistance in the other. A semiconductor diode, the most common type today, is a crystalline piece of semiconductor material with a p n junction connected to two electrical terminals. A vacuum tube diode has two electrodes, a plate (anode) and a heated cathode. Semiconductor diodes were the first semiconductor e ....etc

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