Page 73 - 30105-2003 การวิเคราะห์วงจรอิเล็กทรอนิกส์ความถี่สูง

65
2.

×
×
169.883 10 − 3 × 588.64 69.767
A V (F ) = − = − 11.812
Mid 590.64
V o
A V (F ) = − = − 11.812
Mid
E i
V o V o Z in
ก ก (2.11) A V (F ) = − = − ×
Mid E g E i ( R + Z in )
g
V o 547.521
A V (F Mid ) = − = − 11.812× )
E g (75 547.521+
V o
×
A = − = − 11.812 0.879 = − 10.382
V (F Mid ) E g
I R g r R
′
ก ก (2.12) A = L = m b e C
( i F Mid ) I b ( R + R L )
C
×
×
169.883 10 − 3 × 588.64 1, 000
=
A ( i F Mid ) (1, 000 75 )
+
A ( i F Mid ) = 93.023
V o V o I R L
= − −− −
= − −− −
== =
== =
A V (F ) == = = − −− − 11.812, A V (F ) = − −− − == = 10.382, A ( i F ) = = = = = = = = 93.023;
Mid E i Mid E g Mid I b
2.1.2.5 ก
)
#
*
,

ก.
+, (Power Gain; P )
G
ก (,5

. ก "
ก (P ก
)
out
-

"
( " (P . < .

ก ก ! ก
ก
)
in

& % ."
,( &(! ก , P %
ก (,5
" % ก '
G
"
( " "
ก (
- ก ก
. (. -
V o V o Z in
ก ก (2.11) A V (F Mid ) = − = − ×
E
g E i ( R + Z in )
g
I R g r R
′
ก ก (2.12) A = L = m b e C
( i F Mid ) I b ( R + R L )
C
V I R
P = o × L
G E I
g b
V I R V Z g r R
′
P = o × L = o × in × m b e C
G
E g I b E i ( R + Z in ) ( R + R L )
C
g
V I R g r R R Z g r R
′
′
P = o × L = m b e C L × in × m b e C
G
E g I b (r bb′ + r b e ′ )( R + R L ) ( R + Z in ) ( R + R L )
C
C
g
ก (2.12a) '"ก ! E ก (2.12b) '"ก ! E
i
g
ก

ก
ก