Page 81 - 30105-2003 การวิเคราะห์วงจรอิเล็กทรอนิกส์ความถี่สูง

73
2.

90 −
V o (0.707 )( g r Z R BB )
45
′
m b e out
A V (F L ) = − E g = − ( R BB + r bb′ + r b e ′ )( R + Z BB )
g

7
45
V o ( 0.70 )( g r Z R BB )
′
m b e out
A V (F ) = − = −
L E g ( R BB + r bb′ + r b e ′ )( R + Z BB )
g
)

V o (0.707 g r Z R BB
45
′
m b e out
A V (F ) = − = − ×
L E ( R + Z ) ( R + r bb′ + r b e ′ )
g g BB BB
R BB (r bb′ + r b e ′ )
r
(
- ก Z = Z = , Z = ( bb′ + r );
BB in ) i b e ′
( R BB + r bb′ + r b e ′
Z in = R BB (r bb′ + r b e ′ ) = R BB
Z ( R + r + r )(r + r ) ( R + r + r )
i BB bb′ b e ′ bb′ b e ′ BB bb′ b e ′
)
V o (0.707 g r Z Z in 45
′
m b e out
A = − = − ×
V (F L ) )
E
g ( R + Z in Z i
g
V o V o Z in g r Z Z in
′
m b e out
(
- ก A = − = − × = − ×
V (F Mid ) E g E i ( R + Z in ) Z i ( R + Z in )
g
g
V o (2.16)

$
A V (F L ) = − E g = 0.707A V (F Mid )

,
2.8 ก ,% 2.1 , A V (F L )
V o
)
- .
ก ก (2.16) A = − = (0.707 A
V (F L ) E g V (F Mid )
V o
A V (F L ) = − = (0.707 )( 10.382− ) = − 7.34 45
E
g
V o
= − −− −
== =
A V (F L ) == = E g = − −− − 7.34 45
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