Page 144 - 30105-2003 การวิเคราะห์วงจรอิเล็กทรอนิกส์ความถี่สูง

136

3.

1
ก !ก (3.2) B =
W
π
2 CR
, B = B W (L 21 ) , C = (C BT + C b e ′ ) , R = ( R r b e ′ ) ;
W
gs
1 (3.17)

$
B =
W (L 21 ) 2 Rπ (C BT + C b e ′ )

3.5.2.6 ก
$

'
B W (L )
12

B W (L 12 ) 9
' ( ' &
9 L & 9 R L (ab) % C CT (ab)
21
1
ก !ก (3.2) B =
W
π
2 CR
, B = B W (L 12 ) , C = C CT (ab) , R = R L (ab) ;
W
1

$
B = (3.18)
W (L 12 ) 2 C CT (ab) L (ab)
π
R

"#
3.11 ก + 3.14 + %! 9 B W (L 21 ) % B W (L 12 )
2
1 R r R N 21
gs b e ′
g
- ,
ก !ก (3.17) B W (L ) = , R = , R gs = ;
π
21 2 R (C BT + C b e ′ ) R + r b e ′ N 2 11
gs
1
B W (L ) =
21
×
( 2 3.14 66.851 25 10× × )( × − 12 + 4.675 10 − 12 )
B = 80.267 MHz
W (L 21 )
1 1
ก !ก (3.18) B W (L 12 ) = = − 12
π
×
×
×
2 C
R
CT (ab) L (ab) 2 3.14 80 10 × 1,875
Μ
B W (L 12 ) = 1.061 Hz
Μ Μ Μ
Μ
" B W (L 21 ) = = = = 80.267 MHz, B W (L 12 ) = = = = 1.061 Hz;
Μ
กก + %! 9 B W (L ) = 80.267 MHz % B W (L ) = 1.061 Hz
21 12
1.061 Hz
"
E 29 MHz 8 ก
2 $ 9 "
,
!
' ( ' +;
+& ! 9 B W (L 12 ) = Μ
g
3.5.2.7 ก
$

'
A
V (F R )
ก + %! 9 &
!8 ,.

.' %&
%

ก( ก ,.

.' %
/ r %
ก ก( ก ,.

.' %
/
b e ′
N 12 ! E +>
"
ก9 L % ก( ก % 00>

"
L % ก(
E .# ! 9
R L g 11 21 S
N 32
9 ก V + %! 9 ก !ก (3.8)
b e ′
ก

ก
ก