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TS616IDW датащи(PDF) 31 Page - STMicroelectronics

номер детали TS616IDW
подробное описание детали  Dual wide band operational amplifier with high output current
PDF  36 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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TS616IDW датащи(HTML) 31 Page - STMicroelectronics

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TS616
Increasing the line level using active impedance matching
31/36
10
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
Component calculation
Let us consider the equivalent circuit for a single-ended configuration, as shown in
Figure 69.
Figure 69.
Single-ended equivalent circuit
R4
R2
Vi
Vi
Vo
Vo
RL
100
Ω
1:n
Hybrid
&
Transformer
GND
Vcc+
10
μ
100n
100n
100n
1k
1k
Rs1
Rs2
10n
1
μ
R3
R5
Vo°
Vo°
GND
Vcc+
Vcc+
+
_
+
_
GND
1/2
R1
1/2
R1
Vcc/2
R2
R3
+
_
Vi
Vo
Rs1
-1
Vo°
+
_
-1
½ RL
½ R1
R2
R3
+
_
Vi
Vo
Rs1
-1
Vo°
+
_
-1
½ RL
½ R1



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