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.
