Methods and apparatus for an ADSL transceiver

Details Methods and apparatus for an ADSL transceiver Methods and apparatus for an ADSL transceiver

2007-01-30

2007-01-30

Patel, Jay K. (Department: 2611)

Pulse or digital communications

Transceivers

Modems

C375S260000, C379S406010

Reexamination Certificate

active

10222499

ABSTRACT:
An ADSL transceiver hybrid circuit uses one or more isolated couplers (optical couplers, capacitors, or the like) configured to minimize the transmit signal component in the receive signal path by providing an isolated transmit signal feedback, thereby providing echo cancellation, isolating the telephone loop from the analog front end, and eliminating the need for a complex high-pass filter. The ADSL transceiver provides isolation and echo cancellation by: (a) generating a signal within the analog loop (e.g., telephone loop, or “local loop”) corresponding to a differential transmit signal; (b) receiving a composite signal from the analog loop corresponding to the sum of the transmit signal generated on the analog loop and the receive signal; (c) producing an isolated transmit signal (e.g., through the use of an opto-coupler, capacitor, transformer, or the like); (d) inverting the isolated transmit signal to produce an inverted isolated transmit signal; and (e) producing the differential receive signal based on the sum of the inverted isolated transmit signal and the composite signal.

REFERENCES:
patent: 4339668 (1982-07-01), Mueller et al.
patent: 4645883 (1987-02-01), Horna et al.
patent: 5181228 (1993-01-01), Takatori
patent: 6658055 (2003-12-01), Darr
patent: 6956944 (2005-10-01), Koren
patent: 2003/0031139 (2003-02-01), Thilenius

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