[
prev
] [
prev-tail
] [
tail
] [
up
]
Exercise 3.13
Biasing in an FM transmitter circuit
An answer:
I
C
=
βfe
⋅
I
B
I
B
=
V
C
−
0.6
R
2
V
C
=
V
CC
−
R
3
⋅
(
I
C
+
I
B
)
⟹
I
C
=
βfe
⋅
V
CC
−
R
3
⋅
I
C
βfe
+
1
βfe
−
0.6
R
2
=
βfe
⋅
V
CC
−
0.6
R
2
+
(
βfe
+
1
)
R
3
≈
3
mA
[
prev
] [
prev-tail
] [
front
] [
up
]