第四章晶体管及其小信号放大
-电流源电路电子电路基础
§ 5.1 镜象电流源
BE2BE1BE
21
VVV ==
== bbb
I I I
I I
I
R C B
C B
C
( )
=?
=?
=?
1
2
2
2
2
1
2
b
2
BECC
R
ceo
rr
R
VV
I
=
=
输出电阻基本镜象电流源精密镜像电流源
]
)1(
2
1[
1
2
1
1C
1C
3
1C
13R
bb
b
b
=
=
=
=
I
I
I
I
I
III
B
E
CB
e
RR
VV
I
=
BECC
R
2
§ 5.2 微电流源
O
R
TO
EORE
EE
E
E
TBEBE
T
V
BE
V
BE
V
E
E
T
U
BE
V
S
T
V
BE
V
SE
T
V
BE
V
S
T
V
BE
V
SE
I
I
VRI
IIII
RI
I
I
VVV
e
I
I
eIeII
eIeII
ln
,
ln
)1(
)1(
2
21
2
2
1
21
21
2
1
22
2
11
1
=?
==
==?
=?
=
=
§ 5.3 比例电流源
e2
e1
R
o
e2E2e1E1
B E 2B E 1
e2E2B E 2e1E1B E 1
=
R
R
I
I
RIRI
VV
RIVRIV

§ 5.4 多路电流源
3
33
2
22
ln
ln
C
R
TEC
C
R
TEC
I
I
VRI
I
I
VRI
=
=