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WELCOME
METAL
OXIDE SEMICONDU
CTOR FIELD
EFFECT TRANSISTO
R
Topic
Presented by
Contents
Transistor& Type
A transistor is a semiconductor device used 
to amplify or switch electronic signals and electrical power...
MOSFET Circuit
The metal–oxide–
semiconductor 
field-effect 
transistor (MOSFET,
 MOS-FET, or MOS 
FET) is a type 
of tran...
MOSFET Symbol Circuit
MOSFET
 A MOSFET (Metal Oxide Semiconductor Field Effect Transistor)
is a semiconductor device.
 A MOSFET is most common...
Structure of MOSFET
Schematic structure of
MOSFET
Working principle of MOSFET
 The working principle of MOSFET depends up on the
MOS capacitor.
 The MOS capacitor is the ...
Working principle of MOSFET
Working principle of MOSFET
The depletion region is populated by the bound negative
charges, which are associated with the...
MOS transistors Symbols
D
S
G
D
S
G
G
S
D D
S
G
NMOS Enhancement NMOS
PMOS
Depletion
Enhancement
B
NMOS with
Bulk Contact
...
N and Pchannel of MOSFET
N and Pchannel of MOSFET
 If the MOSFET is an n-channel or nMOS FET, then the
source and drain are 'n+' regions and the b...
MOSFET Applications:

MOSFETs are used in digital integrated circuits, such as
microprocessors.
 Used in calculators.
 ...
MOSFET Applications
• Used as amplifiers.
• Used in the applications of power electronics and switch
mode power supplies.
...
Single-type MOSFET switch
This analog switch uses a four-terminal simple, generally
enhancement mode, MOSFET of either P o...
Single-type MOSFET switch
 The higher the gate voltage with respect to the source,
the lower the resistance of the switch...
Application
 NMOS and PMOS turn on characteristics
 The explosion of digital technologies has
pushed the advancement of MOSFET
technologies faster than any other Si transis...
Limitations of the MOSFET
Overheating is very much a concern when
considering today's integrated circuits contain
millions...
Mosfet
Mosfet
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MOSFET and its application

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  1. 1. WELCOME
  2. 2. METAL OXIDE SEMICONDU CTOR FIELD EFFECT TRANSISTO R Topic
  3. 3. Presented by
  4. 4. Contents
  5. 5. Transistor& Type A transistor is a semiconductor device used  to amplify or switch electronic signals and electrical power. It is  composed of semiconductor material with at least three  terminals for connection to an external circuit. • BJT •FET 1.JFET 2.MOSFET
  6. 6. MOSFET Circuit The metal–oxide– semiconductor  field-effect  transistor (MOSFET,  MOS-FET, or MOS  FET) is a type  of transistor used  for amplifying or  switching  electronic signals.
  7. 7. MOSFET Symbol Circuit
  8. 8. MOSFET  A MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is a semiconductor device.  A MOSFET is most commonly used in the field of power electronics.  A semiconductor is made of manufactured material that acts neither like a insulator nor a conductor.  Types
  9. 9. Structure of MOSFET
  10. 10. Schematic structure of MOSFET
  11. 11. Working principle of MOSFET  The working principle of MOSFET depends up on the MOS capacitor.  The MOS capacitor is the main part.  The semiconductor surface at below the oxide layer and between the drain and source terminal can be inverted from p-type to n-type by applying a positive or negative gate voltages respectively.  When we apply positive gate voltage the holes present beneath the oxide layer experience repulsive force and the holes are pushed downward with the substrate
  12. 12. Working principle of MOSFET
  13. 13. Working principle of MOSFET The depletion region is populated by the bound negative charges, which are associated with the acceptor atoms. The positive voltage also attracts electrons from the n+ source and drain regions in to the channel. The electron reach channel is formed. Now, if a voltage is applied between the source and the drain, current flows freely between the source and drain gate voltage controls the electrons concentration the channel. Instead of positive if apply negative voltage a hole channel will be formed beneath the oxide layer.
  14. 14. MOS transistors Symbols D S G D S G G S D D S G NMOS Enhancement NMOS PMOS Depletion Enhancement B NMOS with Bulk Contact Channel
  15. 15. N and Pchannel of MOSFET
  16. 16. N and Pchannel of MOSFET  If the MOSFET is an n-channel or nMOS FET, then the source and drain are 'n+' regions and the body is a 'p' region.  If the MOSFET is a p-channel or pMOS FET, then the source and drain are 'p+' regions and the body is a 'n' region. 
  17. 17. MOSFET Applications:  MOSFETs are used in digital integrated circuits, such as microprocessors.  Used in calculators.  Used in memories and in logic CMOS gates.  Used as analog switches.  MOSFET devices are also applied in audio-frequency power amplifiers for public address systems
  18. 18. MOSFET Applications • Used as amplifiers. • Used in the applications of power electronics and switch mode power supplies. • MOSFETs are used as oscillators in radio systems. • Used in automobile sound systems and in sound reinforcement systems
  19. 19. Single-type MOSFET switch This analog switch uses a four-terminal simple, generally enhancement mode, MOSFET of either P or N type. In the case of an N-type switch, the body or back gate terminal is connected to the most negative supply (usually GND in single power supply systems) and the gate is used as the switch control. Whenever the gate voltage exceeds the source voltage by at least a threshold voltage, the MOSFET conducts.
  20. 20. Single-type MOSFET switch  The higher the gate voltage with respect to the source, the lower the resistance of the switch will be. An NMOS switch passes all voltages less than (Vgate -Vtn ).  When the switch is conducting, it typically operates in the linear (or triode) region of operation, since the source and drain voltages will typically be nearly equal.
  21. 21. Application  NMOS and PMOS turn on characteristics
  22. 22.  The explosion of digital technologies has pushed the advancement of MOSFET technologies faster than any other Si transistor. This has happened due to the MOSFET being the prime building block of CMOS digital logic circuits.  CMOS circuits are advantageous because they allow virtually no current to pass through and thus consume very little power. Advancements of the MOSFET
  23. 23. Limitations of the MOSFET Overheating is very much a concern when considering today's integrated circuits contain millions of transistors in a relatively small space.  Recently, the small size of MOSFETs has created operational problems as producing such tiny transistors is an enormous challenge,
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