Page 84 - 30105-2003 การวิเคราะห์วงจรอิเล็กทรอนิกส์ความถี่สูง

76
2.

 r  E r R


′
V b e ′ = I b  b e ′  = g b e BB
  (1 J r Cω+ b e T )   a
′
V =
′
m b e out
o g V Z
V o g Z r R
′
m out b e BB
A V (F ) = − = −
H E g a
1 r b e ′ ( R r + R r + R R BB )
g bb′
BB bb′
g
(
- ก Cω T = , R FH = ;
R FH R r + R r + R r + R r + R R
g bb′
g b e ′
BB b e ′
BB bb′
g BB
1 R r + R r + R r + R r + R R
g b e ′
BB bb′
g bb′
BB b e ′
g BB
C = =
ω
T
R FH r b e ′ ( R r + R r + R R )
BB bb′
g bb′
g BB
%
C
a
ω
T
g Z r R
′
m out b e BB
A V (F ) = −
H
a
g Z r R
′
m out b e BB
A V (F H ) = − }
+
+
r
r
R
BB bb′
g b e ′
g bb′
BB b e ′
g BB
{ g ( bb′ + r b e ′ + R BB ) R BB ( bb′ + r b e ′ ) JR r + R r + R r + R r + R R
g Z r R
′
= − m out b e BB
R g (r bb′ + r b e ′ + R BB ) R+ BB (r bb′ + r b e ′ ) JR+ g (r bb′ + r b e ′ + R BB ) R+ BB (r bb′ + r b e ′ )
g Z r R BB
m out b e ′
A V (F H ) = −
r
R
r
{ g ( bb′ + r b e ′ + R BB ) R+ BB ( bb′ + r b e ′ )}(1 J+ ) 1
g Z r R
′
m out b e BB
A = −
V (F H ) 1
R (r + r + R ) R+ (r + r )} ( ) 1 2 + ( ) 1 2 tan − 1
{ g bb′ b e ′ BB BB bb′ b e ′
1
g Z r R
′
m out b e BB
A V (F H ) = −
45
r
r
R
{ g ( bb′ + r b e ′ + R BB ) R+ BB ( bb′ + r b e ′ )} 2
)
(0.707 g Z r R − 45
′
m out b e BB
A V (F H ) = − )
r
r
R g ( bb′ + r b e ′ + R BB ) R+ BB ( bb′ + r b e ′
(
- ก Z in = R BB
Z R + Z in ) { g ( bb′ + r b e ′ + R BB ) R+ BB ( bb′ + r b e ′ )}
r
r
R
( g
i
−
V o (0.707 g Z r Z in
45
) m out b e ′
A V (F H ) = − = − × R +
E g Z i g Z in
V o g Z r Z in
m out b e ′
(
- ก A V (F ) = − = − ×
Mid
E g Z i R + Z in
g
V o −
A V (F ) = − = (0.707 A (F ) 45
) V

$
H E g Mid (2.18)
ก

ก
ก