Hybrid circuit for broadband modems

Details Hybrid circuit for broadband modems Hybrid circuit for broadband modems

2003-10-27

2008-11-18

Ghayour, Mohammad (Department: 2611)

Pulse or digital communications

Cable systems and components

C375S258000, C375S222000, C379S413020, C379S399010

Reexamination Certificate

active

07453943

ABSTRACT:
A hybrid circuit that decouples gains for a transmit signal and a receive signal of a broadband modem that is coupled to a telephone line is provided. The hybrid circuit includes a multi-port transformer, a pair of line matching resistors, and a bridge circuit. The multi-port transformer includes a line coil electrically coupled to a telephone line, a linedriver coil magnetically coupled to the line coil and a receive coil that is also magnetically coupled to the line coil. In an alternate embodiment, a hybrid circuit is provided that includes a multi-port transformer in which the line coil, linedriver coil and receive coil include two coil segments. A broadband modem incorporating a hybrid circuit of the present invention is also provided.

REFERENCES:
patent: 5680397 (1997-10-01), Christensen et al.
patent: 6163579 (2000-12-01), Harrington et al.
patent: 6278695 (2001-08-01), Christensen et al.
patent: 6870928 (2005-03-01), Conroy et al.
patent: 6925172 (2005-08-01), Sabouri et al.
patent: 7054279 (2006-05-01), Robinson et al.
patent: 2006/0062378 (2006-03-01), Choksi

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