WO2008118714A3 - Circuits, methods and systems for loss-of-signal detection and equalization - Google Patents

Circuits, methods and systems for loss-of-signal detection and equalization Download PDF

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Publication number
WO2008118714A3
WO2008118714A3 PCT/US2008/057497 US2008057497W WO2008118714A3 WO 2008118714 A3 WO2008118714 A3 WO 2008118714A3 US 2008057497 W US2008057497 W US 2008057497W WO 2008118714 A3 WO2008118714 A3 WO 2008118714A3
Authority
WO
WIPO (PCT)
Prior art keywords
los
circuit
equalizer
state
adaptive engine
Prior art date
Application number
PCT/US2008/057497
Other languages
French (fr)
Other versions
WO2008118714A2 (en
Inventor
Brian S Leibowitz
Bruno W Garlepp
Carl W Werner
Fred F Chen
Original Assignee
Rambus Inc
Brian S Leibowitz
Bruno W Garlepp
Carl W Werner
Fred F Chen
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rambus Inc, Brian S Leibowitz, Bruno W Garlepp, Carl W Werner, Fred F Chen filed Critical Rambus Inc
Publication of WO2008118714A2 publication Critical patent/WO2008118714A2/en
Publication of WO2008118714A3 publication Critical patent/WO2008118714A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03433—Arrangements for removing intersymbol interference characterised by equaliser structure
    • H04L2025/03439—Fixed structures
    • H04L2025/03445—Time domain
    • H04L2025/03471—Tapped delay lines
    • H04L2025/03484—Tapped delay lines time-recursive
    • H04L2025/0349—Tapped delay lines time-recursive as a feedback filter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03592—Adaptation methods
    • H04L2025/03598—Algorithms
    • H04L2025/03681—Control of adaptation
    • H04L2025/03687—Control of adaptation of step size
    • H04L2025/03694—Stop and go
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
    • H04L25/03057—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a recursive structure

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

A circuit, among other embodiments, includes a combined receiver (sampler), equalizer, adaptive engine (correlator), and LOS circuit. An equalizer circuit provides equalized input signals to the receiver circuit, which outputs data values. The LOS circuit outputs a signal that represents a LOS state when one or more equalized signals fall below an adjustable signal VOffset (or threshold sampling signal). When a LOS state is detected, the adaptation of equalization coefficients is halted until the LOS state is no longer detected, so that the equalizer coefficients will not diverge because of erroneously obtained data values during a LOS state. When a LOS state is not detected, adaptation of equalization coefficients based on received data and error values is allowed to proceed. In one embodiment, portions of the LOS circuit and the adaptive engine circuit are combined. In such an embodiment, adaptation of equalizer coefficients are adjusted based on the received data and error values while the LOS circuit is disabled and LOS status is determined when the adaptive engine is disabled. The adaptive engine is temporarily enabled after the LOS status is determined to be negative (a valid signal is present at the receiver).
PCT/US2008/057497 2007-03-23 2008-03-19 Circuits, methods and systems for loss-of-signal detection and equalization WO2008118714A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US89657407P 2007-03-23 2007-03-23
US60/896,574 2007-03-23

Publications (2)

Publication Number Publication Date
WO2008118714A2 WO2008118714A2 (en) 2008-10-02
WO2008118714A3 true WO2008118714A3 (en) 2009-02-05

Family

ID=39789238

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2008/057497 WO2008118714A2 (en) 2007-03-23 2008-03-19 Circuits, methods and systems for loss-of-signal detection and equalization

Country Status (1)

Country Link
WO (1) WO2008118714A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8432959B2 (en) * 2007-10-31 2013-04-30 Agere Systems Llc Method and apparatus for equalization using one or more qualifiers
GB2478760B (en) * 2010-03-17 2016-03-23 Phyworks Ltd Adaptive equalizing repeater with output control
US8953665B2 (en) * 2013-02-15 2015-02-10 Lsi Corporation Pattern-based loss of signal detector

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0376434A (en) * 1989-08-18 1991-04-02 Toshiba Corp Automatic equalizer
US5363411A (en) * 1991-06-27 1994-11-08 Nec Corporation Low power consumption receiver with adaptive equalizer
EP0667533A2 (en) * 1994-02-14 1995-08-16 Hewlett-Packard Company Loss-of-signal detector
JPH07264101A (en) * 1994-03-22 1995-10-13 Matsushita Electric Ind Co Ltd Automatic equalizer
US20030227968A1 (en) * 2002-06-11 2003-12-11 Hyoung-Nam Kim Method and apparatus for blind decision feedback equalization
JP2007059012A (en) * 2005-08-26 2007-03-08 Hitachi Ltd Method for controlling waveform equalization, optical disk system, and waveform equalization circuit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0376434A (en) * 1989-08-18 1991-04-02 Toshiba Corp Automatic equalizer
US5363411A (en) * 1991-06-27 1994-11-08 Nec Corporation Low power consumption receiver with adaptive equalizer
EP0667533A2 (en) * 1994-02-14 1995-08-16 Hewlett-Packard Company Loss-of-signal detector
JPH07264101A (en) * 1994-03-22 1995-10-13 Matsushita Electric Ind Co Ltd Automatic equalizer
US20030227968A1 (en) * 2002-06-11 2003-12-11 Hyoung-Nam Kim Method and apparatus for blind decision feedback equalization
JP2007059012A (en) * 2005-08-26 2007-03-08 Hitachi Ltd Method for controlling waveform equalization, optical disk system, and waveform equalization circuit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PICCHI G ET AL: "BLIND EQUALIZATION AND CARRIER RECOVERY USING A STOP-AND-GO DECISION-DIRECTED ALGORITHM", IEEE TRANSACTIONS ON COMMUNICATIONS, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. COM-35, no. 9, 1 September 1987 (1987-09-01), pages 877 - 887, XP002005146, ISSN: 0090-6778 *

Also Published As

Publication number Publication date
WO2008118714A2 (en) 2008-10-02

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