Adaptive cable equalizer

Details Adaptive cable equalizer Adaptive cable equalizer

1996-09-13

1999-11-02

Pham, Chi H.

Pulse or digital communications

Equalizers

Automatic

375229, 375230, 375233, 333 18, 333 24R, 333 28R, 36472419, H03H 730, H03H 500, G03G 1104, G06F 1710

Patent

active

059784172

ABSTRACT:
An adaptive cable equalizer is provided with a simple architecture, wherein a single control structure: controls the adaptation of the filter for compensating for cable length while simultaneously compensating for process and temperature variations; optimizes the SNR at any cable length by controlling biasing current sources; and uses a two-stage architecture which eliminates start-up problems and optimizes output levels to obtain optimal dc restoration while simultaneously allowing for independent optimization of the output levels of the recovered data in accordance with other requirements as desired. An analog adaptive equalizing filter is used for accurately synthesizing the inverse transfer function of cables of variable lengths. Data rates up to and beyond 400 Mbps are supported and the adaptive behavior automatically compensates for different cable lengths as well as process variations (with respect to the process(es) used for fabricating the equalizer in a monolithic form) and temperature variations.

REFERENCES:
patent: 5124673 (1992-06-01), Hershberger
patent: 5257286 (1993-10-01), Ray
patent: 5670916 (1997-09-01), Korn
patent: 5699022 (1997-12-01), Tovar
S. Webster, E. Fankhauser, K. Chen, J. Francis, E. Ioszef, T. Rosati, I. Ridpath and P. Moore, "A New Chip Set for Proposed SMPTE Standard SMPTE 259M-Serial Digital Interface", SMPTE Journal, Sep. 1993, pp. 777-785.

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