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Chapter 4: FIELD EFFECT
TRANSISTOR
Dr. Gopika Sood,
PG Govt. College For Girls,
Sector -11, Chandigarh
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OUTLINE
Field EffectTransistor
Advantages of FET
Operation of Transistor
Input and Output Characteristics of FET
FET Amplifier
MOSFET
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FIELD EFFECT TRANSISTOR
Field-effect transistor (FET) are important devices
such as BJTs
Also used as amplifier and logic switches
Types of FET:
JFET (junction field-effect transistor)
MOSFET (metal-oxide-semiconductor field-effect
transistor)
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CLASSIFICATION SCHEME FOR
FET
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VOLTAGE CONTROLLED
AMPLIFIER
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ADVANTAGES OF FET
High input impedance (M)
(Linear AC amplifier system)
Temperature stable than BJT
Smaller than BJT
Can be fabricated with fewer processing
BJT is bipolar – conduction both hole and electron
FET is unipolar – uses only one type of current carrier
Less noisy as compared to BJT
Usually use as logic switch
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DISADVANTAGES OF FET
Easy to damage as compared to BJT
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JUNCTION FIELD EFFECT
TRANSISTOR (JFET)
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n-CHANNEL FET
N channel JFET:Major structure is n-type material (channel)
between embedded p-type material to form 2 p-n
junction.
In the normal operation of an n-channel
device, the Drain (D) is positive with respect
to the Source (S). Current flows into the Drain (D),
through the channel, and out of the Source (S)
Because the resistance of the channel depends on
the gate-to-source voltage (VGS), the drain current
(ID) is controlled by that voltage
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n-CHANNEL JFET
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p-CHANNEL FET
P channel JFET:
Major structure is p-type material (channel)
between embedded n-type material to form 2
p-n junction.
Current flow : from Source (S) to Drain (D)
Holes injected to Source (S) through p-type
channel and flowed to Drain (D)
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p-CHANNEL FET
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n CHANNEL FET
Circuit Diagram for n- Channel FET
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OUTPUT CHARACTERISTICS
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TRANSFER CHARACTERISTICS
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FET AMPLIFIER
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FET AMPLIFIER
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METAL OXIDE FIELD EFFECT
TRANSISTOR
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METAL OXIDE FIELD EFFECT
TRANSISTOR
Depletion MOSFET
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INPUT AND TRANSFER
CHARACTERISTICS