Page 102 - 30105-2003 การวิเคราะห์วงจรอิเล็กทรอนิกส์ความถี่สูง

94
2.

2.2.2.3 ก
)
#
*
Z (+# Z
o
out
2.2.2.3.1 Z - & 3
"
ก . (
ก !ก %&$
o
R R
- . ก (
& ก g V "
%
. -

( ) %
"

∞
D
L
m
(,G
,% 2.21
Z = ∞ (2.51)
o
2.2.2.3.2 Z - & 3

ก . (
ก !ก "
"
out

,% 2.21

Z out = { o ( R R L )}
Z
D
R R
* % Z = ∞ , R = ( R R ) = D L ;
o
D
out
L
( R + R L )
D
R R (2.52)
D L

$
Z = R = ( R R ) =
out out D L
( R + R L )
D
,
,
2.24 ก ,% 2.19 , Z Z , Z Z
i in o out
- .
ก ก (2.49) Z = ∞
i
3
×
×
R R 590 10 × 47 10 3
ก ก (2.50) Z = R = G 1 G 2 = = 43.532 kΩ
in GG
( R G 1 + R G 2 ) ( 590 10 + 47 10 3 )
×
3
×
ก ก (2.51) Z = ∞
o
1.8 10 × 2 10 3
×
×
3
ก ก (2.52) Z out = R out = ( R R L ) = ( 1.8 10 + 2 10 3 ) = 947.368 Ω
D
3
×
×
Ω
Z = ∞ ∞= ∞ ∞ , Z in = = = = 43.532 k , Z = ∞ ∞Ω Ω o == ∞ ∞ , Z out = = = = 947.368 ;
=
= =
Ω Ω
Ω Ω Ω
i
2.2.2.4 ก
)
#
*
A
V (F Mid )
A V (F Mid ) -

ก . V E
o
i
,% 2.22 " ก
G D
I i I = 0 I d
R g g g V
V m
E i R GG R D R L V O
E
g
S
Z Z Z Z
in i o out
,% 2.22 , A V (F Mid ) (/
ก

ก
ก