Page 145 - 30105-2003 การวิเคราะห์วงจรอิเล็กทรอนิกส์ความถี่สูง

137

3.

E P = E S , E = E N S ;
P
N P N S S N P
, E = E , N = N , N = N ;
P i P 11 S 21
E N 21 E r ′ r N 2 11
b e ′
g b ep
E = V b e ′ = , E = , r b ep = ;
i
′
i
S
N 11 R + r b ep N 2 21
′
g
E r ′ N
g b ep

$
E = V = × 21 (3.19)
S b e ′
R + r N
′
g b ep 11
r b e ′ g V N
E S V b e ′ m b e ′ R L N 12
32

N 12
+ 3.15 ! ก( ก ,.

.'
/ r % R L
b e ′
N 32
V o g R N 12 E r ′ N 21 ;
g b ep
m L
A = − ,V = − × ×
V (F R ) E g o N 32 R + r b ep N 11
′
g
g R N 12 r b ep N 21
′
m L
A = − × ×
V (F R ) R +
N
′
32 g r b ep N 11

ก 0 T "
V ! 0 & ก
ก E

2 o g

V o g R N 12 r b ep N 21 (3.20)
′
m L

$
A V (F R ) = = × ×
E
′
g
g N 32 R + r b ep N 11

"#
3.12 ก + 3.14 + %! 9 A
V (F R )
2 2
r N 11 615.324× ( ) 1 615.324 Ω
b e ′
- ,
r = = =
′
b ep 2 2
N 21 ( ) 1
−
3
195.019 10 × 75 5 615.324 1
×
×
ก !ก (3.20) A V (F ) = × × = 65.186
+
R
1 75 615.324 1
A V (F R ) = 65.186
" A V (F R ) = == = 65.186
3.5.2.8 ก
$

'
R C
n n
, R % C +;
& &

%& ก? + % ) &9
)ก !ก
/ - !
n n
&9 ก L ! 0 & ก
ก 0 +>
Q +;
ก "
C !9!
b c ′
1
32
ก

ก
ก