Page 75 - 30105-2003 การวิเคราะห์วงจรอิเล็กทรอนิกส์ความถี่สูง

67
2.

"
"

(% ก ! F ( L C B ) % . X (% ก ! R FLCB
, F ( L C B ) ก ก
C
B
R FLCB r bb′ b′

r b e ′ V b e ′ g V
m b e ′
R
E out
g

,% 2.8 , F ( L C B )

X C B = R FLCB

1
(
- ก X =
C B
π
C
2 F ( L C B ) B
1 = R
π
C
2 F ( L C B ) B FLCB
1 (2.13)

$
F ( L C B ) =
π
C
2 R
FLCB B
R FLCB r bb′ b′

r b e ′ V b e ′ g V
m b e ′
R
E out
g

r
R ( bb′ + r b e ′ )
r
R = R + R ( bb′ + r )} = R + BB
FLCB g { BB b e ′ g + )
R
( BB r bb′ + r b e ′
r bb′ b′
r b e ′ R FLCB

R FLCB

,% 2.9 , R FLCB

# (,5
"
%
% (
C

ก , R
FLCB B
,% 2.9

R BB (r bb′ + r b e ′ )
R FLCB = R + { BB ( bb′ + r b e ′ )} = R +
R
r
g
g
( R BB + r bb′ + r b e ′ )
ก

ก
ก