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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)： | 16/17頁 |
| 文件大?。?/td> | 255K |
| 代理商： | HC-5502X |
4-16
Transhybrid Balance
Consider Figure A3. Evaluate V
TX
in terms of V
RX
, in order
to establish transhybrid balance equation.
For general case, let line transhybrid impedance be Z
B
.
From Equation 3:
Compare Equations 4 and 5: we need to scale Equation 5 by:
in order to equate to Equation 4.
Transhybrid balance can be achieved using simple summing
amplifier network.
If Z
B
- Zo then Equation 5 becomes:
and Equation 4 becomes:
∴
V
TX
= -V
RX
and TH balance is achieved using a resistive
summing amp network. The complete application circuit is
shown in Figure A4.
FIGURE A3.
Vo
2
V
RX
2R
--------
V
----------
+
+
–
=
Vm
2Vs
–
–
F
Z
B
-------------+
Vo
×
=
=
V
TX
F
B
)
--------------+
Vo
×
=
(EQ. 3)
(EQ. 4)
V
RX
-------
+
--------
V
----------
+
+
–
=
2V
RX
Z
F
Z
Zo
Z
B
Zo
B
-------------+
Vo
×
–
=
V
RX
+
(
)
–
F
)
------------------+
Vo
×
=
(EQ. 5)
Zo
B
Zo
---------+
V
'
RX
F
B
)
------------------+
Vo
×
=
V
'
RX
∴
V
–
-------------
=
5
V
RX
)
Zo
F
)
------–
Vo
×
=
(EQ. 6)
V
TX
F
-------------+
Vo
×
=
(EQ. 7)
Application Note 549
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