This document discusses field effect transistors (FETs). It defines FETs and describes their basic working mechanisms, including junction FETs (JFETs) and metal-oxide-semiconductor FETs (MOSFETs). The document also covers biasing circuits for FET amplifiers, types of FETs such as enhancement and depletion mode MOSFETs, and applications of FETs such as in analog switches and amplifiers.

1. Field Effect Transister(FET’s)

2. Defination(FET’s)
The field-effect transistor (FET) is a transistor that
uses an electric field to control the shape and hence
the electrical conductivity of a channel of
osemiconductor material.

3. Advantages of(FET’s)

4. Working of (FET’s)
The JFET (junction field-effect transistor) uses a
reverse biased p–n junction to separate the gate
from the body. The MOSFET (metal–oxide–
semiconductor field-effect transistor) utilizes an
insulator (typically SiO2) between the gate and the
body. ... The DGMOSFET (dual-gate MOSFET) is
a FET with two insulated gates.

5. Working circuit

6. Baising
The level of VDS can be determined by applying KVL
to the output circuit. The voltage-
divider bias arrangement applied to BJT transistor
amplifiers is also applied To FET amplifiers. The basic
construction is exactly the same but the dc analysis
of each is quite difference.

7. Bies circuit for n-channel (FET’s)

8. Fixed biasing circuit for (FET’s)

9. Self bias circuit for(FET’s)

10. Types of(FET’s)
Field Effect transistor’s are of mainly of two types
based on construction features of the device
Junction Field Effect Transistor
Metal oxide semiconductor Field Effect Transistor.

11. JFET’s subdivided
JFET’s are again subdivided into two types based on
the type of channel namely p channel JFET and n-
channel JFET. Similarly MOSFET’s are divided into two
types a) Enhancement mode MOSFET 2) Depletion
mode MOSFET. In Enhancement mode MOSFET
channel is induced by applying gate voltage contrary
to the depletion mode MOSFET in which already
existing channel is modulated by applying gate
voltage like JFET.

12. FET’s types define

13. FET’s Amplifier
An FET amplifier is an amplifier which uses one or
more field-effect transistors (FETs). The main
advantage of an FET used for amplification is that it
has very high input impedance and low output
impedance.

14. Generalized amplifier

15. Amplifier
Electronics Tutorial about the Common Source JFET
Amplifier and Common Source JFET Circuit, its
Common Source Connection and Characteristics
Curves.

16. Common source FET’s amplifier

17. Application
Field Effect Transistors (FETs) are used as Analog
Switches The application of FETs as the switches in
analog circuits is a direct consequence of their mode
of working. This is because when the Gate-Source
voltage, VGS is zero, n-channel FET will operate in
saturation region and will act like (almost) a short
circuit.

18. FET’s as analog switch

19. Other application

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