TS616 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TS616' PDF : 36 Pages View PDF
TS616
10
Increasing the line level using active impedance matching
Increasing the line level using 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 68 for a
differential line.
Figure 68. TS616 as a differential line driver with active impedance matching
100n
+
Vcc+
Vcc+
1k
Vi
_
GND
R2
R3
1/2 R1
Vcc/2
1/2 R1
R5
Vi
10μ
100n
1k
GND
R4
+ Vcc+
100n
_
GND
Rs1
Vo°
Vo°
Rs2
1μ
10n
Vo
RL
1:n
Hybrid
& 100Ω
Transformer
Vo
Component calculation
Let us consider the equivalent circuit for a single-ended configuration, as shown in
Figure 69.
Figure 69. Single-ended equivalent circuit
+
Vi
_
½ R1
R2
R3
Rs1
Vo°
Vo
-1
½ RL
31/37
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