Page 157 - 30105-2003 การวิเคราะห์วงจรอิเล็กทรอนิกส์ความถี่สูง
P. 157
149
3.
R R
C L
ก !ก (2.9) Z = R = ( R R ) =
out out C L R + )
( C R L
V = g V Z
′
m b e out
o
R ( bb′ + r )
r
E = I Z = I i R CF 2 + BB b e ′
i incf
i
2
( R BB + r bb′ + r b e ′ )
R ( R + r + r ) R ( bb′ + r )
+
r
E = I i CF 2 BB bb′ b e ′ BB b e ′
i
2
( R BB + r bb′ + r b e ′ )
E i ( R BB + r bb′ + r b e ′ )
I = 2
i
R ( R + r + r ) R+ (r + r )
CF 2 BB bb′ b e ′ BB bb′ b e ′
I R = E R BB
i
i BB
I =
2
b ( R BB + r bb′ + r b e ′ ) R CF 2 ( R BB + r bb′ + r b e ′ ) R BB (r bb′ + r b e ′ )
+
V b e ′ = I r
b b e ′
E R r
BB b e ′
i
V b e ′ = 2
r
R CF 2 ( R BB + r bb′ + r b e ′ ) R+ BB ( bb′ + r b e ′ )
ก E = 0.5E
i
i
1
2
)
(0.5 E R r
BB b e ′
i
V b e ′ = 1
R CF 2 ( R BB + r bb′ + r b e ′ ) R+ BB ( bb′ + r b e ′ )
r
)
V o (0.5 g Z r R (3.31)
′
m out b e BB
A = − = −
V (F R ) E i 1 R CF 2 ( R BB + r bb′ + r b e ′ ) R+ BB ( bb′ + r b e ′ )
r
, A &
!8 ,.
.'
V (F R )
3.7.3 ก
.
BCCD
ก
++ #
"# *
+
)
ก + %! 9 !8 &
(F , F 9 !8 &
"
X C T
H
H
9
! 9 9 ก 9 !&
& X %! < "
A ! 9 9 ก 0.707A +;
ก
C T V (F H ) V (F R )
& ! ! 8
.( & "
ก
"
9
!8 9
'
) !8 " & F %& ก 9 F ก ก % 9 +;
(
9
R
H
ก + 3.20 +;
ก ก
!ก R
&9 X
C
FH
T
R FH = ( { R CF 2 R BB ) r+ bb′ } r
b e ′
)
R R + r bb′ ( CF + R BB
R
R FH = CF 2 BB + 2 ) r b e ′
R
( CF 2 R BB
R 2 BB + r bb′ ( CF 2 + R BB )} b e ′
R
R
r
{ CF
R =
FH + + + +
R
r
R
R
R
{ CF 2 BB r bb′ ( CF 2 R BB )} ( CF 2 R BB ) b e ′
ก
ก
ก
