Full duplexing for power line data communications
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United States of America Patent
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N/A
Issued Date -
Oct 30, 2003
app pub date -
Apr 29, 2003
filing date -
Apr 29, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
There is provided a coupling circuit for a full duplex modem having a transmitter and a receiver. The coupling circuit includes (a) a first transformer having a primary winding and a secondary winding, where the primary winding is coupled to the transmitter, (b) a second transformer having a primary winding and a secondary winding, where the primary winding of the second transformer is coupled to a communications line, and (c) a resistance between a terminal of the primary winding of the first transformer and a terminal of the primary winding of the second transformer. The secondary windings of the first and second transformers are connected in series, with opposing phase, and coupled to the receiver to minimize a level of a signal from the transmitter from reaching the receiver.
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