Page 86 - 30105-2003 การวิเคราะห์วงจรอิเล็กทรอนิกส์ความถี่สูง

78
2.

,
2.11 ก ,% 2.1 , B (
ก / 3
K . A V
W
A V (F Mid ) dB
ก !
( )
F
- .
ก ก (2.19) B = F −
F
W H L
* % F = 144.172 MHz, F = 1.065 MHz;
H L
×
6
×
6
B = 144.172 10 − 1.065 10 = 143.107 MHz
W
B = == = 143.107 MHz
W
F
,
L
A V (F L ) ( dB = 20 log A V (F L ) = 20 log − 7.340 = 20 − ) 3 dB
)
( 0.15 = −
A 10 A 10 − 10.382
V (F Mid ) V (F Mid )
F
,
H

A V (F H ) ( dB = 20 log 10 A V (F H ) = 20 log 10 − 7.340 = 20 − ) 3 dB
)
( 0.15 = −
A V (F Mid ) A V (F Mid ) − 10.382

" (
ก /
,% 2.17

A V
A V F )
( Mid
dB
B W = 143.107 MHz

(F Mid )

F (log scale)
F = 1.065 MHz F = 144.107 MHz
H
L
,% 2.17 3
K . A V ก ! F ,% 2.1
A V (F Mid ) dB

2.1.5 ก
ก(

!
ก.
$ ก
ก(

Ω
Ω

V = 12 V, R = 75 , R = 75 , F ≤ 1 MHz, F ≥ 250 MHz,T = 25 C;
CC g L L H A
* ( - ก F = 1 MHz, F = 250 MHz;
H
L
ก

ก
ก