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| 型號： | HC-5502X |
| 廠商： | Intersil Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 15/17頁 |
| 文件大?。?/td> | 255K |
| 代理商： | HC-5502X |
4-15
Appendix A
Complex Line Impedance Matching with SLIC
Consider Figure A1. Assume V
RX
= 0.
(2W to 4W transmission). At match:
This matching equation can be realized as shown in Figure
A2.
FIGURE A1. TWO TO FOUR WIRE TRANSMISSION. SINGLE ENDED AC EQUIVALENT CIRCUIT OF SUBSCRIBER LOOP.
i
s
V
T
----------
--------
=
=
Zo
2R
F
Zo
'
+
=
Zo
'
s
-------
=
Vo
Zo
'
i
s
i
s
Zo
2i
s
R
F
–
=
=
but Vm = i
s
Zo
Vo
Vm
2i
s
R
F
–
=
∴
;
(EQ. 1)
(EQ. 2)
Vs
i
s
R
F
Vs
R
F
Zo
'
+
F
Zo
'
)
--------------+
Vm
×
=
∴
,
=
Vm
i
s
R
F
(
)
2R
------------------------------
(
)
=
∴
2
( )
in 1
for Vm, and Zo = 2R
F
F
Zo
'
+
Vo
2Vs
----------
1
–
=
FIGURE A2. FOUR WIRE TO TWO WIRE TRANSMISSION
Application Note 549
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