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TS613 Datenblatt(PDF) 6 Page - STMicroelectronics

Teilenummer TS613
Bauteilbeschribung  STMicroelectronics Solutions for ADSL Line Interfaces
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS613 Datenblatt(HTML) 6 Page - STMicroelectronics

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TA0313
STMicroelectronics Solutions for ADSL Line Interfaces
Increasing the line level by using an active impedance matching
With passive matching, the output signal amplitude of the driver must be twice the amplitude on the load.
To go beyond this limitation an active matching impedance can be used. With this technique it is possible
to maintain good impedance matching with an amplitude on the load higher than half of the output driver
amplitude. This concept is shown in Figure 7 for a differential line.
Component calculation
Let us consider the equivalent circuit for a single-ended configuration, as shown in Figure 8.
For unloaded system, we can assume that currents through R1, R2 and R3 are respectively:
Figure 7: TS613 as a differential line driver with an active impedance matching
Figure 8: Single ended equivalent circuit
½R1
R4
R2
_
+
_
+
Vi
Vi
Vo
Vo
3
2
6
5
1
7
4
GND
8
+12V
25
100
1:2
Hybrid
&
Transformer
GND
+12V
3k9
3k9
10µ
100n
100n
100n
1k
1k
Rs1
10n
_
+
_
+
Vi
Vi
Vo
Vo
3
2
6
5
1
7
4
GND
8
+12V
25
1:2
Hybrid
&
Transformer
GND
+12V
3k9
3k9
10µ
100n
100n
100n
1k
1k
10n
Rs2
R5
R3
½R1
Vo°
Vo°
½R1
R4
R2
_
+
_
+
Vi
Vi
Vo
Vo
3
2
6
5
1
7
4
GND
8
+12V
25
100
1:2
Hybrid
&
Transformer
GND
+12V
3k9
3k9
10µ
100n
100n
100n
1k
1k
Rs1
10n
_
+
_
+
Vi
Vi
Vo
Vo
3
2
6
5
1
7
4
GND
8
+12V
25
1:2
Hybrid
&
Transformer
GND
+12V
3k9
3k9
10µ
100n
100n
100n
1k
1k
10n
Rs2
R5
R3
½R1
Vo°
Vo°
1/2
R1
R2
R3
+
_
Vi
Vo
Rs1
-1
Vo°
1/2
RL
2Vi
R1
---------
Vi
Vo
°
()
R 2
--------------------------- and
Vi
Vo
+
()
R 3
------------------------
,


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