Page 236 - 30105-2003 การวิเคราะห์วงจรอิเล็กทรอนิกส์ความถี่สูง

228
6.

ก # 4' 6.3 3 !ก

V = g V ( R out R L )
m b e ′
o
$ ก g V = I
m b e ′
c
V = I c ( R out R L )
o
R
R out L
$ ก ( R R ) =
out L
( R out + R L )
I R R
V = c out L (6.4)
o
( R out + R L )
2
( ) R R
I
P = I V = c out L (6.5)
c o
in
( R out + R L )
( ) 2 I R R ) 2
V
P = o = ( c out L (6.6)
out 2
R +
R
L ( out R L ) R L
2 ) 2 )
R
I
R
R
P ( ) ( out L ( out + R L
c
ก !ก (6.5) (6.6) P = out = ×
G
P + 2 2
I
R
R
in ( out R L ) R L ( ) R out L
c
R out
% P = (6.7)
G
( R out + R L )

! 6.2 ก # 4' 6.3 ! " P !$ ก
" ! !1 H2 R ก R
G out L
R out
"# $ ก !ก (6.7) P =
G
( R out + R L )
1 R L R L 1
6 I R out = R P = = =
G
L
4 ( R + 4R L ) 5R L 5
L
1 R L 1
6 I R out = R P = =
L
G
3 ( R + 3R L ) 4
L
1 R L 1
6 I R out = R P = =
G
L
2 ( R + 2R L ) 3
L
R L =
1
6 I R out = R P =
G
L
( R + R L ) 2
L
2R L 2
6 I R out = 2R P = =
G
L
(2R + R L ) 3
L
3R L 3
6 I R out = 3R P = =
L
G
(3R + R L ) 4
L
4R L 4
6 I R out = 4R P = =
G
L
(4R + R L ) 5
L
ก

ก
ก