n this video, the brief introduction to the Field Effect Transistor (FET) has been given and the different types of FETs are discussed. By watching this video, you will learn the following topics:0:20 What is Field Effect Transistor (FET)?1
3:18 Types of FET
What is Field Effect Transistor (FET)?
The FET is a terminal device that uses an electric field to control the current flowing through the device.
The three terminals of the FET are known as Gate, Drain, and Source.
It is a voltage controlled device, where the input voltage controls the output current.
Application of FETs:
1) Amplifier
2) Oscillator
3) Analog Switch
4) Integrated Circuits
5) Buffer Amplifiers
Differences between the BJT and FET :
1) The FET is a unipolar device, while BJT is a bipolar device
2) The input impedance of FET is very high compared to BJT
3) The power consumption in FET is less than BJT
4) In size, the FETs are smaller than BJT
5) Thermally, FETs are more stable than BJT
Types of FET:
There are many types of FETs. But mainly there are two types of FET:
1) JFET (Junction Field Effect Transistor)
1.1 n-channel JFET
1.2 p-channel JFET
2) IG-FET (Insulated Gate Field Effect Transistor)
MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is the most common type of IG-FET, where a layer of SiO2 is used as an insulating layer to insulate the gate from the channel.
The MOSFET can be further classified into
2.1 Depletion-type MOSFET (n-channel and p-channel)
2.2 Enhancement-Type MOSFET (n-channel and p-channel)
This video will be helpful to all the students of science and engineering in understanding what is FET and the different types of FET.
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