modelos pequenos sinais tbj
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8/16/2019 Modelos Pequenos Sinais TBJ
1/1
6.6 Basic BJT Amplifier Configurations 42
Table 6.4 Small-Signal Models of the BJT
Hybrid-π Model
( g mvπ ) Version
( g mvπ ) Version (α i) Version
Model Parameters in Terms of DC Bias Currents
In Terms of g m
In Terms of r e
Relationships between α and β
β ib( ) Version
r r ogmv
E
B C
v
r r o ib
E
B C
ib
r e
r o
E
C
B
gmv
v
r e
r o
E
C
B
i
i
g m I C V T ------= r e
V T I E ------ α
V T I C ------= = r π
V T I B------ β
V T I C ------= = r o
V A I C ---------=
r eα
g m------= r π
β
g m------=
g mα
r e----= r π β 1+( )r e= g m
1
r π ----+
1
r e----=
β α
1 α –------------= α
β β 1+------------= β 1+
1
1 α –------------=
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