Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2007-03-20
2010-06-08
Corrielus, Jean B (Department: 2611)
Pulse or digital communications
Equalizers
Automatic
C375S285000, C375S348000
Reexamination Certificate
active
07733952
ABSTRACT:
Various systems and methods providing high speed decoding, enhanced power reduction and clock domain partitioning for a multi-pair gigabit Ethernet transceiver are disclosed. ISI compensation is partitioned into two stages; a first stage compensates ISI components induced by characteristics of a transmitter's partial response pulse shaping filter in a demodulator, a second stage compensates ISI components induced by characteristics of a multi-pair transmission channel in a Viterbi decoder. High speed decoding is accomplished by reducing the DFE depth by providing an input signal from a multiple decision feedback equalizer to the Viterbi based on a tail value and a subset of coefficient values received from a unit depth decision-feedback equalizer. Power reduction is accomplished by adaptively truncating active taps in the NEXT, FEXT and echo cancellation filters, or by disabling decoder circuitry portions, as channel response characteristics allow. A receive clock signal is generated such that it is synchronous in frequency with analog sampling clock signals and has a particular phase offset with respect to one of the sampling clock signals. This phase offset is adjusted such that system performance degradation due to coupling of switching noise from the digital sections to the analog sections is substantially minimized.
REFERENCES:
patent: 4631735 (1986-12-01), Qureshi
patent: 4805215 (1989-02-01), Miller
patent: 4811361 (1989-03-01), Bacou et al.
patent: 5031194 (1991-07-01), Crespo et al.
patent: 5031195 (1991-07-01), Chevillat et al.
patent: 5056117 (1991-10-01), Gitlin et al.
patent: 5142377 (1992-08-01), Moriyama et al.
patent: 5159282 (1992-10-01), Serizawa et al.
patent: 5208829 (1993-05-01), Soleimani et al.
patent: 5249205 (1993-09-01), Chennakeshu et al.
patent: 5283811 (1994-02-01), Chennakeshu et al.
patent: 5307405 (1994-04-01), Sih
patent: 5367536 (1994-11-01), Tsujimoto
patent: 5388092 (1995-02-01), Koyama et al.
patent: 5416799 (1995-05-01), Currivan et al.
patent: 5428361 (1995-06-01), Hightower et al.
patent: 5455819 (1995-10-01), Sugiyama
patent: 5473702 (1995-12-01), Yoshida et al.
patent: 5485490 (1996-01-01), Leung et al.
patent: 5497401 (1996-03-01), Ramaswamy et al.
patent: 5513215 (1996-04-01), Marchetto et al.
patent: 5517435 (1996-05-01), Sugiyama
patent: 5521767 (1996-05-01), Weng et al.
patent: 5524026 (1996-06-01), Murata
patent: 5526347 (1996-06-01), Chen et al.
patent: 5539773 (1996-07-01), Knee et al.
patent: 5541956 (1996-07-01), Ueda
patent: 5561687 (1996-10-01), Turner
patent: 5566191 (1996-10-01), Ohnishi et al.
patent: 5572167 (1996-11-01), Alder et al.
patent: 5604741 (1997-02-01), Samueli et al.
patent: 5617450 (1997-04-01), Kakuishi et al.
patent: 5631931 (1997-05-01), Takano et al.
patent: 5644603 (1997-07-01), Ushirokawa
patent: 5646957 (1997-07-01), Im et al.
patent: 5659609 (1997-08-01), Koizumi et al.
patent: 5675612 (1997-10-01), Solve et al.
patent: 5692011 (1997-11-01), Nobakht et al.
patent: 5694437 (1997-12-01), Yang et al.
patent: 5726607 (1998-03-01), Brede et al.
patent: 5745564 (1998-04-01), Meek
patent: 5757855 (1998-05-01), Strolle et al.
patent: 5784415 (1998-07-01), Chevillat et al.
patent: 5796725 (1998-08-01), Muraoka
patent: 5825777 (1998-10-01), Komarek et al.
patent: 5825818 (1998-10-01), Kaku et al.
patent: 5828589 (1998-10-01), Degenhardt
patent: 5870433 (1999-02-01), Huber et al.
patent: 5872817 (1999-02-01), Wei
patent: 5892801 (1999-04-01), Schneider
patent: 5896067 (1999-04-01), Williams
patent: 5909384 (1999-06-01), Tal et al.
patent: 5917856 (1999-06-01), Torsti
patent: 5933495 (1999-08-01), Oh
patent: 5937007 (1999-08-01), Raghunath
patent: 5940455 (1999-08-01), Ikeda
patent: 5946349 (1999-08-01), Raghunath
patent: 5968198 (1999-10-01), Hassan et al.
patent: 5999567 (1999-12-01), Torkkola
patent: 6009120 (1999-12-01), Nobakht
patent: 6012161 (2000-01-01), Ariyavisitakul et al.
patent: 6072433 (2000-06-01), Young et al.
patent: 6084907 (2000-07-01), Nagano et al.
patent: 6115427 (2000-09-01), Calderbank et al.
patent: 6151370 (2000-11-01), Wei
patent: 6177951 (2001-01-01), Ghosh
patent: 6233286 (2001-05-01), Wei
patent: 6246716 (2001-06-01), Schneider
patent: 6269116 (2001-07-01), Javerbring et al.
patent: 6370189 (2002-04-01), Morrison et al.
patent: 6377619 (2002-04-01), Denk et al.
patent: 6452936 (2002-09-01), Shiino
patent: 6535554 (2003-03-01), Webster et al.
patent: 6570919 (2003-05-01), Lee
patent: 6633894 (2003-10-01), Cole
patent: 6690739 (2004-02-01), Mui
patent: 6690754 (2004-02-01), Haratsch et al.
patent: 6724844 (2004-04-01), Ghosh
patent: 6744814 (2004-06-01), Blanksby et al.
patent: 6889355 (2005-05-01), Calderbank et al.
patent: 2003/0108113 (2003-06-01), He et al.
patent: 2004/0196897 (2004-10-01), Tan et al.
patent: 2004/0213342 (2004-10-01), Ghosh
patent: 2005/0207510 (2005-09-01), Ojard
patent: 0 206 770 (1986-12-01), None
patent: 0 496 152 (1992-07-01), None
patent: 0 756 404 (1997-01-01), None
patent: 0 778 687 (1997-06-01), None
patent: 0 889 612 (1999-01-01), None
patent: 2 219 469 (1989-12-01), None
patent: 99/22482 (1999-05-01), None
Bermans, J.W.M., et al., “On The Use of Decision Feedback for Simplifying the Viterbi Detector”, Philips Journal of Research, 1987, pp. 399-428, vol. 42, No. 4, Philips Research Laboratories, The Netherlands.
Raheli, R., et al., “Per-Survivor Processing: A General Approach to MLSE in Uncertain Environments”, IEEE Transactions on Communications, Feb./Mar./Apr. 1995, pp. 354-364, vol. 43, No. 2/3/4, IEEE, XP-002059868.
Abnous Arthur
Agazzi Oscar E.
Creigh John L.
Hatamian Mehdi
Kruse David E.
Broadcom Corporation
Corrielus Jean B
McAndrews Held & Malloy Ltd.
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