BJT Models
2
Review:: BJT small-signal equival circuit models (1) Hybrid- model T c m V I g = and c T m I V g r β β π = = , !ere " T # $%m" is t!e t!ermal voltage & c : is t!e ' current at collector ($) T-model E C B i b B r π C E g m v be i c i e + _ v be "oltage-controlled current source B r π C E βi b i b i c i e + _ v be urrent-controlled current source
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Transcript of BJT Models
E&CE 319 Basic Circuits
Review:: BJT small-signal equivalent circuit models
(1) Hybrid- model
and ,
Where VT = 25mV is the thermal voltage
Ic: is the DC current at collector (2) T-model
and ,
Where VT = 25mV is the thermal voltage
Ic: is the DC current at collector
IE: is the DC current at emitter
vbe
E
vbe
_
ib
+
ie
_
+
ie
ib
ic
ic
ib
gmvbe
E
vbe
E
ib
Voltage-controlled current source
vbe
_
+
ie
ic
gmvbe
re
C
B
Current-controlled current source
ib
_
C
+
E
ie
re
ic
B
C
C
Current-controlled current source
E
B
ib
Voltage-controlled current source
C
r
B
r
B
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