Line driver for an adaptive hybrid circuit

Details Line driver for an adaptive hybrid circuit Line driver for an adaptive hybrid circuit

2004-12-03

2009-08-11

Gauthier, Gerald (Department: 2614)

Multiplex communications

Duplex

Transmit/receive interaction control

C330S286000, C333S117000, C333S124000, C370S252000, C375S257000, C379S391000, C379S399010, C379S406100, C379S412000, C455S101000

Reexamination Certificate

active

07573839

ABSTRACT:
A second output transmission signal (“TX2”) added to a line driver is a scaled version of the main output transmission signal (“TX1”). TX2is scaled from TX1by a variable scale factor K. An adaptive hybrid circuit subtracts TX1and TX2from a line signal carrying both a line transmission signal and a line received signal (“RX”). A programmable impedance Ztuneis coupled between the TX2output of the line driver and the RX output of the adaptive hybrid circuit. A transmission echo in the output RX signal is measured. K and Ztuneare then adaptively tuned to minimize the transmission echo. The hybrid in this case becomes a 4-port network, one port specifically added to adaptively cancel the transmission echo in the RX output of the adaptive hybrid circuit. Alternatively, the hybrid may be a 3-port hybrid including variable impedances to cancel the line transmission signal.

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