Page 82 - 30105-2003 การวิเคราะห์วงจรอิเล็กทรอนิกส์ความถี่สูง

74
2.

X (% ก ! R
, F " ก ก
C T FH H
X = R
C T FH
1
(
- ก X C T = 2 F Cπ H T

" 1 = R
FH
π
2 F C
H T
1

$
F = (2.17)
H
2 Rπ FH C T
r bb′ b′ C = C b e ′ + C b c ′ (1 g R+ m out )
T

m b e ′
C T r b e ′ V b e ′ g V
E g

Z out

,% 2.15 , F A
H V (F H )

C = C b e ′ + C b c ′ (1 g R+ m out )
T
r bb′ R FH 1 R FH
B b′ C r bb′
R g r g V
C T b e ′ m b e ′
R g R BB r b e ′ C
E R BB T
g
E

 R R   r R

′
r
R =  g BB + r bb′ ,R = ( b e ′ R ) = b e FH 1 ;
FH 1 ) FH FH 1 + )
R +
r
 ( g R BB   ( b e ′ R FH 1

,% 2.16 ก , R
FH
ก , R # (,5
"
%
% (
C
FH T

,% 2.16
 R R  R r + R r + R R


R FH 1 = r  bb′ + g BB  = g bb′ BB bb′ g BB
 ( R + R BB )  ( R + R BB )


g
g
r R 1
′
b e FH
R = (r R ) =
FH b e ′ FH 1 )
r
( b e ′ + R FH 1
r b e ′ ( R r + R r + R R )
BB bb′
g bb′
g BB
R FH =
R r + R r + R r + R r + R R
g b e ′
g bb′
BB bb′
BB b e ′
g BB
ก

ก
ก