Junction Field Effect Transistor (JFET) 

This video explains the construction, and working of N-channel JFET and P-channel JFET, Different types of FETs and the output characteristic curves (Drain curves) are also discussed.
JFET (Junction Field Effect Transistor) :
The junction field Effect Transistor (JFET) is used in a wide range of applications. It is a three-terminal device (Gate, Drain, and Source), That uses an electric field to control the current flowing through the device. It is a voltage-controlled device, where the input voltage controls the output current.
Types of FET:
There are mainly two types of FETs:
1) JFET and 2) IG-FET
1) JFET (Junction Field Effect Transistor):
N-channel JFET
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
Depletion-type MOSFET (N-channel and P-channel)
Enhancement-Type MOSFET (N-channel and P-channel)
N-channel JFET:
The channel is made up of N-type semiconductor material and two small P-type regions are attached at the opposite sides of the middle part of the channel.
P-channel JFET:
The channel is made up of P-type semiconductor material and two small N-type regions are
attached at the opposite sides of the middle part of the channel.
JFET operates in different regions:
1) Ohmic region
2) Saturation Region
3) Cut-off Region
4) Avalanche breakdown Region
Application of FETs:
1) Cascade Amplifier
2) Oscillator
3) Analog Switch
4) Multiplexer
5) Chopper
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 Noise level of a FET is less than BJT
4) In size, the FETs are smaller than BJT
5) FETs are Voltage controlled devices where BJTs are Current controlled devices
6) FETs have faster switching speed than BJTs
Timestamps for various topics covered in this video are as follows:
0:34 Types of Transistors
1:20 What is Field Effect Transistor (FET)?
1:46 Construction of N-Channel and P-Channel JFETs
3:24 Working of N-Channel JFET
6:45 Depletion regions formation in a JFET
8:57 Output characteristic curve of N-Channel JFET
10:06 Pinch-off voltage of JFET
12:37 Different regions of operation of an N-channel JFET
15:06 How does JFETs Gate voltage controls the Drain current?
18:28 Working of P-Channel JFET
20:03 JFET as an Amplifier
22:48 Differences between JFET and BJT
23:42 Applications of JFET
This video will be helpful to all students of science and engineering in understanding the construction and working of JFET.
The links for the other useful videos:
1) Bipolar junction transistor (BJT)
• Transistor (Bipolar Ju...
2) PN Junction Diode
• PN Junction Diode and ...
3) Semiconductors (P-type and N-type)
• Semiconductor: P-Type ...
4) Avalanche Breakdown and Zener Breakdown
• Avalanche Breakdown an...
5) Zener Diode as a Voltage Regulator
• Zener Diode as a Volta...
#JFET
#JFETWorking
#NchannelJFET
#PchannelJFET
#FET
#TypesofFET
#What is the difference between JFET and BJT?
#What is JFET and its characteristics?
#What is JFET used for?
#What is JFET and its types?
#What is JFET?
Please SUBSCRIBE to my RU-vid channel
‪@ElectronicsAD‬
Music Credit:
www.bensound.com/
"Keep Learning and Keep Growing".