PPT: Fet Amplifier

# PPT: Fet Amplifier Notes | Study Analog Electronics - Electrical Engineering (EE)

## Document Description: PPT: Fet Amplifier for Electrical Engineering (EE) 2022 is part of FET Amplifier for Analog Electronics preparation. The notes and questions for PPT: Fet Amplifier have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about PPT: Fet Amplifier covers topics like and PPT: Fet Amplifier Example, for Electrical Engineering (EE) 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for PPT: Fet Amplifier.

Introduction of PPT: Fet Amplifier in English is available as part of our Analog Electronics for Electrical Engineering (EE) & PPT: Fet Amplifier in Hindi for Analog Electronics course. Download more important topics related with FET Amplifier, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free. Electrical Engineering (EE): PPT: Fet Amplifier Notes | Study Analog Electronics - Electrical Engineering (EE)
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FET Amplifier
Chapter8. FET Amplifier
? FET small-signal model
Transconductance g
m
output impedance r
d
? Model applied to some configurations
D- & E-MOSFET
JFET: Fixed biasing
Self biasing
V oltage divider
Page 2

FET Amplifier
Chapter8. FET Amplifier
? FET small-signal model
Transconductance g
m
output impedance r
d
? Model applied to some configurations
D- & E-MOSFET
JFET: Fixed biasing
Self biasing
V oltage divider
FET Amplifier
FET Transconductance
FET is voltage-controlled device.
?I
D
=g
m
?V
GS
The V
GS
controls the I
D
of an FET.
The change in V
GS
will result a change of
the I
D
in the following manner:
where the g
m
is referred to as transconductance.
It is provided as y
fs
on datasheet.
Page 3

FET Amplifier
Chapter8. FET Amplifier
? FET small-signal model
Transconductance g
m
output impedance r
d
? Model applied to some configurations
D- & E-MOSFET
JFET: Fixed biasing
Self biasing
V oltage divider
FET Amplifier
FET Transconductance
FET is voltage-controlled device.
?I
D
=g
m
?V
GS
The V
GS
controls the I
D
of an FET.
The change in V
GS
will result a change of
the I
D
in the following manner:
where the g
m
is referred to as transconductance.
It is provided as y
fs
on datasheet.
FET Amplifier
FET Input Impedance
The input impedance of all commercially
available FET is sufficiently large to assume
that the terminals approximate an open circuit.
Z
in
= ??
The typical value of Z
in
is 10
9
? for JFET and
10
12
~10
15
? for MOSFET.
Page 4

FET Amplifier
Chapter8. FET Amplifier
? FET small-signal model
Transconductance g
m
output impedance r
d
? Model applied to some configurations
D- & E-MOSFET
JFET: Fixed biasing
Self biasing
V oltage divider
FET Amplifier
FET Transconductance
FET is voltage-controlled device.
?I
D
=g
m
?V
GS
The V
GS
controls the I
D
of an FET.
The change in V
GS
will result a change of
the I
D
in the following manner:
where the g
m
is referred to as transconductance.
It is provided as y
fs
on datasheet.
FET Amplifier
FET Input Impedance
The input impedance of all commercially
available FET is sufficiently large to assume
that the terminals approximate an open circuit.
Z
in
= ??
The typical value of Z
in
is 10
9
? for JFET and
10
12
~10
15
? for MOSFET.
FET Amplifier
FET Output Impedance
The output impedance of FET is typically
from 20k ? to 100k ?.
Z
out
=r
d
= 1/y
os
It is defined by the reciprocal of the slop of the
output characteristics, I
D
~V
DS
.
On datasheet, output impedance is provided as
y
os
with the units of ?S.
Page 5

FET Amplifier
Chapter8. FET Amplifier
? FET small-signal model
Transconductance g
m
output impedance r
d
? Model applied to some configurations
D- & E-MOSFET
JFET: Fixed biasing
Self biasing
V oltage divider
FET Amplifier
FET Transconductance
FET is voltage-controlled device.
?I
D
=g
m
?V
GS
The V
GS
controls the I
D
of an FET.
The change in V
GS
will result a change of
the I
D
in the following manner:
where the g
m
is referred to as transconductance.
It is provided as y
fs
on datasheet.
FET Amplifier
FET Input Impedance
The input impedance of all commercially
available FET is sufficiently large to assume
that the terminals approximate an open circuit.
Z
in
= ??
The typical value of Z
in
is 10
9
? for JFET and
10
12
~10
15
? for MOSFET.
FET Amplifier
FET Output Impedance
The output impedance of FET is typically
from 20k ? to 100k ?.
Z
out
=r
d
= 1/y
os
It is defined by the reciprocal of the slop of the
output characteristics, I
D
~V
DS
.
On datasheet, output impedance is provided as
y
os
with the units of ?S.
FET Amplifier
FET AC Equivalent Circuit
Shown in the figure is the  FET AC equivalent
circuit.
The control of I
d
by V
gs
is included as a
controlled current source.
The input impedance is represented by the
open circuit between G & S.
The output impedance is represented by the
resistor r
d
between D & S.
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