Page 182 - 30105-2003 การวิเคราะห์วงจรอิเล็กทรอนิกส์ความถี่สูง

174
4.

. E r 5 V (4%
i b e ′
b e ′
R i (0- )
π
E g r R (4.12)
′
i m b e E
% & I =
d 2 )
R ( R + r + R
π
i (0- ) E d 2 L
! . % 0ก
R , (0- )
(
4% ก
ก (4.12)

V o (0- ) L π
π
1 ก - R
L
% & V o (0- ) = I R (4.13)
π
L
d
2
*& 4.11 (
I .5(V o (0- )
! ก
% E = 25 mV peak
π
d
i
2
E g r R
′
i m b e E
+ , ก
ก (4.12) I =
d 2 )
R i (0- ) ( R + r d 2 + R L
π
E
Ω
$% r d 2 = 4.762 k , g = 216.459 mS;
m
Ω
Ω
r b e ′ = 461.981 , R i (0- ) = 56.507 k , E = 25 mV peak ;

π
i
( 25 10 − 3 × 216.459 10 − 3 × 461.981 560 )
×
×
×
I d = = 404.025 nA
×
×
2
+
3
×
56.507 10 3 ( 560 4.762 10 + 56 10 3 )
ก
ก (4.13) V o (0- ) = I R
π
L
d
2
Ω
$% I d = 404.025 nA, R = 56 k ;
L
2
×
×
V o (0- ) = 404.025 10 − 9 × 56 10 3
π
V = 22.625 mV
π
o (0- ) peak
* I d 2 = = = = 404.025 nA peak ,V o (0- ) = = = = 22.625 mV peak ;
π ππ
π
4.2.3 ก

!!" ก
#$$%&
ก% ( - π ππ π
π π
π
π
2 )
R in ( -2 ) R i ( -2 )
π
π
π
π
r bb′ b′ D 1
r 1 d I 1 d
r b e ′ V b e ′ g V
m b e ′
E g D 2
( -2π π ) I e
R EP 1 R E V o (0- )
π

1 4.8 . % 4==D ก (. 5 -
ก5 , ( - π ππ π # 1 4.5
π π
π
π
2 )
ก

ก
ก