fet small signal analysis
DESCRIPTION
FET Small Signal Analysis. ENGI 242 ELEC 222. g m at Q. g m varies with V GS. FET Small-signal Equivalent Circuit. FET Small-signal Equivalent Circuit. FET small-signal equivalent circuit that accounts for the dependence of i D on v DS. Determination of r d. Determination of r d. - PowerPoint PPT PresentationTRANSCRIPT
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FET Small Signal Analysis
ENGI 242
ELEC 222
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March 2003 FET Small Signal Bias 2
gm at Q
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March 2003 FET Small Signal Bias 3
gm varies with VGS
GSm m0
P
DSSm0
P
V g = g 1 -
V
2I g =
V
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March 2003 FET Small Signal Bias 4
FET Small-signal Equivalent Circuit
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March 2003 FET Small Signal Bias 5
FET small-signal equivalent circuit that accounts for the dependence of iD on vDS.
FET Small-signal Equivalent Circuit
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March 2003 FET Small Signal Bias 6
Determination of rd
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March 2003 FET Small Signal Bias 7
Determination of rd
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March 2003 FET Small Signal Bias 8
Common-source Amplifier
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March 2003 FET Small Signal Bias 9
Common-source Small-signal Equivalent Circuit
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March 2003 FET Small Signal Bias 10
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March 2003 FET Small Signal Bias 11
.
CS Amplifier Voltage Divider Bias
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March 2003 FET Small Signal Bias 12
vo(t) and vin(t) versus time
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March 2003 FET Small Signal Bias 13
Gain magnitude versus frequency
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March 2003 FET Small Signal Bias 14
Source Follower
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March 2003 FET Small Signal Bias 15
Source Follower Small-signal ac Equivalent
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March 2003 FET Small Signal Bias 16
Source Follower Output Resistance
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March 2003 FET Small Signal Bias 17
Common Gate Amplifier
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March 2003 FET Small Signal Bias 18
CG AC Equivalent Circuit