Page 71 - 30105-2003 การวิเคราะห์วงจรอิเล็กทรอนิกส์ความถี่สูง

63
2.

+
=
Z = 2 588.64 590.64 Ω
i
R Z R BB (r bb′ + r b e ′ )
ก ก (2.7) Z = ( R BB Z i ) = BB i =
in
( R BB + Z i ) ( R BB + r bb′ + r b e ′ )
3
×
×
R R 2 30 10 × 10 10 3 7,500 Ω
B
1 B
(
- ก R BB = = =
3
×
( R B 1 + R B 2 ) ( 30 10 + 10 10 3 )
×
×
R Z 7,500 590.64
Z = BB i = = 547.521 Ω
in )
( R BB + Z i ) (7,500 590.64+
ก ก (2.8) Z = ∞
o
×
3
1 10 × 75
ก ก (2.9) Z out = R out = = 69.767 Ω
( 1 10 + 75 )
3
×
g = == = 169.883 mS, r b e ′ ′′ ′ = = = = 588.64 , Z = =Ω Ω i = = 590.64 , Z in = = = = 547.521 , Z = ∞ ∞Ω Ω o == = , ∞ ∞
Ω
Ω Ω
Ω Ω Ω
Ω Ω
m
Ω
Ω Ω Ω
Z = = = = 69.767 ;
out
2.1.2.4 ก
)
#
*
A (+# A
V (F Mid ) ( i F Mid )

2.1.2.4.1 A -

ก .
V
V (F Mid ) o
E ก ,% 2.7
(
ก "
( " "
i

E = I b (r bb′ + r b e ′ )
i
E
I = i
b
r
( bb′ + r b e ′ )
E r E r
i b e ′
i b e ′
V b e ′ = I r = =
b b e ′
r
( bb′ + r b e ′ ) Z i
ก "
ก V = I Z
o c out
(
- ก I = g V
c m b e ′
V = g V Z
′
o m b e out
E r
i b e ′
(
- ก V b e ′ =
Z
i
g E r Z
′
V =
m i b e out
o
Z i
V o g r Z g r R R (2.10)
′
′
m b e out
m b e C L

$
A V (F Mid ) = − = − = − )
R +
E
r
i Z i ( bb′ + r b e ′ )( C R L
ก

ก
ก