Data transmission device
First Claim
1. A data transmission device for generating an output signal to be transmitted via a transmission line, the output signal including a transmission signal and a direct current (DC) supply voltage, comprising:
- a first terminal allocated to a first wire of the transmission line;
a second terminal allocated to a second wire of the transmission line;
a first output driver for generating a first split signal to be transmitted via the first wire of the transmission line;
a second output driver for generating a second split signal to be transmitted via the second wire or the transmission line, whereby an alternating current (AC) current-related difference of the two split signals corresponds to the transmission signal;
a first resistor located between an output of the first output driver and the first terminal;
a second resistor located between an output of the second output driver and the second terminal;
a first filter device to separate a first DC supply voltage component from a decreasing voltage measured by a first measurement device and decreasing at the first resistor;
a second filter device to separate a second DC supply voltage component from a decreasing voltage measured by a second measurement device and decreasing at the second resistor;
a first adding device to add a first adding signal corresponding to the first DC supply voltage component to the first split signal fed to the first output driver; and
a second adding device to add a second adding signal corresponding to the second DC supply voltage component to the second split signal fed to the second output driver.
6 Assignments
0 Petitions
Accused Products
Abstract
An output signal to be transmitted via an especially two wire transmission line (A, B), which is composed of a transmission signal and a DC supply voltage, is generated by a data transmission device especially designed in the form of a SLIC circuit. Using a control circuit (5-8), which tracks the DC supply voltage on the output side of the transmission device (1-3) in such a manner that the level of the DC supply voltage does not decrease, it is possible to ensure that both the specified requirements concerning the maximally admissible DC voltage drop as well as the specified requirements concerning the reflection attenuation are met.
8 Citations
8 Claims
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1. A data transmission device for generating an output signal to be transmitted via a transmission line, the output signal including a transmission signal and a direct current (DC) supply voltage, comprising:
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a first terminal allocated to a first wire of the transmission line;
a second terminal allocated to a second wire of the transmission line;
a first output driver for generating a first split signal to be transmitted via the first wire of the transmission line;
a second output driver for generating a second split signal to be transmitted via the second wire or the transmission line, whereby an alternating current (AC) current-related difference of the two split signals corresponds to the transmission signal;
a first resistor located between an output of the first output driver and the first terminal;
a second resistor located between an output of the second output driver and the second terminal;
a first filter device to separate a first DC supply voltage component from a decreasing voltage measured by a first measurement device and decreasing at the first resistor;
a second filter device to separate a second DC supply voltage component from a decreasing voltage measured by a second measurement device and decreasing at the second resistor;
a first adding device to add a first adding signal corresponding to the first DC supply voltage component to the first split signal fed to the first output driver; and
a second adding device to add a second adding signal corresponding to the second DC supply voltage component to the second split signal fed to the second output driver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification