Page 90 - 30105-2003 การวิเคราะห์วงจรอิเล็กทรอนิกส์ความถี่สูง

82
2.

R = 1.68 kΩ (,5
4
R = 1.6 kΩ
C
C
R = 714.061 Ω (,5
4
R = 680 Ω
E E
R B 1 = 48.997 kΩ (,5
4
R B 1 = 47 kΩ
R = 13.705 kΩ (,5
4
R = 13 kΩ
B 2 B 2
2.1.5.4 ก

F .
!
% ก ! ( - '" "
%
4

V − V )
( TH
ก ก (2.3) I = BE
B
R TH + ( β + ) 1 R E
F
I
ก ก (2.4) I = β F B
C
}
ก ก (2.5) V = V − I R + ( β + ) 1 I R
CE CC { C C F B E
-
"
∗. (. V " < 3 (ก&
0.5 V
" . ก(ก&
. .(,
, R .
)
&
-
±
CE B 1
R .
2
B
,
2.14 ! %
%
& (

)
×
×
V CC B 2 12 13 10 3 2.6 V
R
- .
ก ก (2.1) V = = =
TH
×
×
3
( R B 1 + R B 2 ) ( 47 10 + 13 10 3 )
3
×
×
R R 2 47 10 × 13 10 3 10.183 kΩ
1 B
B
ก ก (2.2) R = = =
TH
×
3
×
( R B 1 + R B 2 ) ( 47 10 + 13 10 3 )
(V − V ) (2.60 0.6− )
ก ก (2.3) I = TH BE = = 21.630 µA
B
3
×
×
R TH + (β + ) 1 R E 10.183 10 + (121 680 )
F
I =
×
ก ก (2.4) I = β F B 120 21.630 10 − 6 = 2.595 mA
×
C
}
I R +
ก ก (2.5) V CE = V CC − { C C ( β + ) 1 I R
F
B E
×
×
+
×
×
V CE = 12 − ( { 2.595 10 − 3 × 1.6 10 3 ) ( 121 21.630 10 − 6 × 680 )}
V CE = 6.068 V
I = == = 21.630 µA, I = == = 2.595 mA,V = = = = 6.068 V;
B C CE
2.1.5.5 ก
ก.
$
C , C (+# C
B C E
(3- ก
ก ก !! # ก .
C ! ) ก "
B

('- ( " (!
ก

ก
ก