Transformer-coupled matching impedance
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United States of America Patent
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-
Sep 14, 2004
Grant Date -
May 1, 2003
app pub date -
Oct 22, 2002
filing date -
Oct 25, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for matching impedance in the circuitry of an xDSL communication device to improve noise cancellation resulting from signal leakage between transmit and receive signals. The system for matching impedance includes a transformer configured to couple an impedance, which is substantially equal to a line impedance, to a line coupling transformer, and is applicable to all known hybrid topologies. The transformer is ideally as closely matched to the line coupling transformer as possible. This technique allows greatly improved impedance matching in the hybrid, which directly benefits the performance of xDSL communication devices.
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