MOSFET - Depletion Type MOSFET Explained

N-Channel and P-Channel Depletion type MOSFET Construction, Working principle, Symbols, Characteristics, and Applications Explained

IG-FET (Insulated Gate Field Effect Transistor) or
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 Depletion type MOSFET:
The entire N-channel DMOSFET is constructed on a block of P-type semiconductor material called Substrate. Two heavily doped N-type semiconductors are diffused on this substrate, Source and Drain terminals are brought out through metallic contacts from these two N-regions, and another heavily doped N-region is added between the Drain and Source regions, Now the entire surface of the substrate is coated with silicon dioxide. On this layer, a thin metallic plate is attached and the Gate terminal is brought out from this metallic plate, So the Gate terminal is insulated with the channel.

P-channel Depletion type MOSFET:
A P-channel DMOSFET is similar in construction, except it uses N-type Substrate and P-type channels.
The entire P-channel DMOSFET is constructed on a block of N-type semiconductor material called Substrate. Two heavily doped P-type semiconductors are diffused on this substrate, Source and Drain terminals are brought out through metallic contacts from these two P-regions, and another heavily doped P-region is added between the Drain and Source regions, Now the entire surface of the substrate is coated with silicon dioxide. On this layer, a thin metallic plate is attached and the Gate terminal is brought out from this metallic plate, So the Gate terminal is insulated with the channel.

Applications of Depletion type MOSFET:
Depletion type MOSFET's are generally used where an application demands current flow at zero Gate voltage.
1) Start-up circuit of SMPS,
2) Surge protection for Linear voltage regulators,
3) Constant current source,
4) High-voltage ramp generator,
5) High-voltage protection circuit,
6) Solid-state relay

Timestamps for various topics covered in this video are as follows:

1:15 Depletion type MOSFET Construction

2:52 Symbols of Depletion type MOSFET

4:24 Working of N-channel Depletion type MOSFET

5:57 Output characteristics of N-channel Depletion type MOSFET

11:29 Transfer characteristics of N-channel Depletion type MOSFET

12:55 Working of P-channel Depletion type MOSFET

15:05 Output and Transfer characteristics of P-channel Depletion type MOSFET

15:43 Applications of Depletion type MOSFET

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) Junction Field Effect Transistor (JFET)

2) Bipolar Junction Transistor (BJT)

3) PN Junction Diode

4) Semiconductors

5) How does a Capacitor works?

6) Current, Voltage, and Power

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[ElectronicsAD]

Timestamps for various topics covered in this video are as follows:
1:15 Depletion type MOSFET Construction
2:52 Symbols of Depletion type MOSFET
4:24 Working of N-channel Depletion type MOSFET
5:57 Output characteristics of N-channel Depletion type MOSFET
11:29 Transfer characteristics of N-channel Depletion type MOSFET
12:55 Working of P-channel Depletion type MOSFET
15:05 Output and Transfer characteristics of P-channel Depletion type MOSFET
15:43 Applications of Depletion type MOSFET

[standfordthomas]

Can I get a reply? Is P channel means for positive, and N channel for negative, . or it's the other way around?.

[mzrhccz]

Please forgive me Ashok Sir because I have spoken bad about you in my mind. Please forgive me and wish that I dont do it again … Love your teaching 😊👍😭 Sorry Again