WO2002097799A3 - Method and apparatus for operating a continuous time filter of a read/write channel for a hard disk drive - Google Patents

Method and apparatus for operating a continuous time filter of a read/write channel for a hard disk drive Download PDF

Info

Publication number
WO2002097799A3
WO2002097799A3 PCT/US2002/016328 US0216328W WO02097799A3 WO 2002097799 A3 WO2002097799 A3 WO 2002097799A3 US 0216328 W US0216328 W US 0216328W WO 02097799 A3 WO02097799 A3 WO 02097799A3
Authority
WO
WIPO (PCT)
Prior art keywords
read
ctf
servo
mode
filter
Prior art date
Application number
PCT/US2002/016328
Other languages
French (fr)
Other versions
WO2002097799A2 (en
Inventor
Sasan Cyrusian
Original Assignee
Infineon Technologies Ag
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 Infineon Technologies Ag filed Critical Infineon Technologies Ag
Priority to DE60218692T priority Critical patent/DE60218692T2/en
Priority to EP02737115A priority patent/EP1412940B1/en
Publication of WO2002097799A2 publication Critical patent/WO2002097799A2/en
Publication of WO2002097799A3 publication Critical patent/WO2002097799A3/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
    • G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals

Abstract

A method and apparatus for operating a continous time filter (CTF)(128) of a read/write channel (108) for a hard disk drive (100). The apparatus includes an input muliplexer (220) that receives an analog signal (215) and transmits the analog signal (215) to a read filter (254) when the CTF (128) is in read mode and to a servo filer circuit (256) when the CTF (128) is in servo mode. The apparatus also includes an output multiplexer (222) that receives a read filter output signal (225) from the read filter circuit (254) when the CTF (128) is in read mode and a servo filter output signal (227) from the servo filter circuit (256) when the CTF (128) is in servo mode. The method includes receiving the analog signal (215) by the input miltiplexer (220) and routing the analog signal (215) to the read filter circuit (254) when the CTF (128) is in read mode and routing the analog signal (215) to the servo filter circuit (256) when the CTF (128) is in servo mode.
PCT/US2002/016328 2001-05-25 2002-05-22 Method and apparatus for operating a continuous time filter of a read/write channel for a hard disk drive WO2002097799A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE60218692T DE60218692T2 (en) 2001-05-25 2002-05-22 METHOD AND DEVICE FOR OPERATING A TIME-CONTINUOUS FILTER OF A READ / WRITE CHANNEL FOR A HARD DRIVE
EP02737115A EP1412940B1 (en) 2001-05-25 2002-05-22 Method and apparatus for operating a continuous time filter of a read/write channel for a hard disk drive

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/865,861 2001-05-25
US09/865,861 US6697204B2 (en) 2001-05-25 2001-05-25 Method and apparatus for operating a continuous time filter of a read/write channel for a hard disk drive

Publications (2)

Publication Number Publication Date
WO2002097799A2 WO2002097799A2 (en) 2002-12-05
WO2002097799A3 true WO2002097799A3 (en) 2004-02-26

Family

ID=25346404

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/016328 WO2002097799A2 (en) 2001-05-25 2002-05-22 Method and apparatus for operating a continuous time filter of a read/write channel for a hard disk drive

Country Status (5)

Country Link
US (1) US6697204B2 (en)
EP (1) EP1412940B1 (en)
CN (1) CN1305062C (en)
DE (1) DE60218692T2 (en)
WO (1) WO2002097799A2 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6552865B2 (en) * 2001-05-25 2003-04-22 Infineon Technologies Ag Diagnostic system for a read/write channel in a disk drive
EP1563500B1 (en) * 2002-11-22 2017-04-26 Marvell International, Ltd. An efficient analog front end for a read/write channel of a hard disk drive running from a highly regulated power supply
KR100564624B1 (en) * 2004-05-07 2006-03-28 삼성전자주식회사 Method for designing write and read frequency in data storage system and disk drive using the same
US7583459B1 (en) 2004-11-18 2009-09-01 Marvell International Ltd. Method and apparatus for write precompensation in a magnetic recording system
US7211973B1 (en) * 2005-01-07 2007-05-01 Marvell Asia Pte, Ltd. System and process for utilizing back electromotive force in disk drives
US7974037B2 (en) * 2008-02-21 2011-07-05 Hitachi Global Storage Technologies Netherlands, B.V. Techniques for providing DC-free detection of DC equalization target
US8261173B2 (en) * 2009-04-29 2012-09-04 Menara Networks, Inc. Calibration method and circuit for an add-compare-select loop
US8947821B1 (en) 2014-07-17 2015-02-03 International Business Machines Corporation Detecting a servo pattern using a data channel in a magnetic tape drive
US11900970B2 (en) * 2021-01-29 2024-02-13 Seagate Technology Llc Magnetoresistive asymmetry compensation

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4722010A (en) * 1985-04-30 1988-01-26 Kabushiki Kaisha Toshiba Read circuit for floppy disk drive
US5642244A (en) * 1993-02-03 1997-06-24 Texas Instruments Incorporated Method and apparatus for switching between data and servo modes
EP0808046A2 (en) * 1996-05-16 1997-11-19 Symbios Logic Inc. Digital signal processing apparatus and method
US5796535A (en) * 1995-05-12 1998-08-18 Cirrus Logic, Inc. Sampled amplitude read channel employing a user data frequency synthesizer and a servo data frequency synthesizer
US5956196A (en) * 1993-04-09 1999-09-21 Western Digital Corporation Disk drive employing dynamically reconfigured read channel to process a read signal at two different frequencies
US6178056B1 (en) * 1997-03-11 2001-01-23 Western Digital Corporation Disk drive employing state variable trap registers for providing stored servo and user data state variables to sampled-data channel

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2799071B2 (en) * 1990-11-21 1998-09-17 株式会社東芝 Magnetic recording / reproducing device
US5463603A (en) * 1992-03-18 1995-10-31 Imp, Inc. Computer disk drive integrated data path circuit optimized for handling both data and servo signals
JPH08212736A (en) * 1995-02-02 1996-08-20 Toshiba Corp Servo signal detector for magnetic disk apparatus and servo signal detecting method
US6219387B1 (en) 1996-04-04 2001-04-17 Texas Instruments Incorporated Metric circuit and method for use in a viterbi detector
US5862007A (en) * 1996-04-18 1999-01-19 Samsung Electronics Co., Ltd. Method and apparatus for removing baseline shifts in a read signal using filters
JP3464121B2 (en) 1997-06-11 2003-11-05 沖電気工業株式会社 Viterbi decoding method and Viterbi decoding device
US6148431A (en) 1998-03-26 2000-11-14 Lucent Technologies Inc. Add compare select circuit and method implementing a viterbi algorithm

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4722010A (en) * 1985-04-30 1988-01-26 Kabushiki Kaisha Toshiba Read circuit for floppy disk drive
US5642244A (en) * 1993-02-03 1997-06-24 Texas Instruments Incorporated Method and apparatus for switching between data and servo modes
US5956196A (en) * 1993-04-09 1999-09-21 Western Digital Corporation Disk drive employing dynamically reconfigured read channel to process a read signal at two different frequencies
US5796535A (en) * 1995-05-12 1998-08-18 Cirrus Logic, Inc. Sampled amplitude read channel employing a user data frequency synthesizer and a servo data frequency synthesizer
EP0808046A2 (en) * 1996-05-16 1997-11-19 Symbios Logic Inc. Digital signal processing apparatus and method
US6178056B1 (en) * 1997-03-11 2001-01-23 Western Digital Corporation Disk drive employing state variable trap registers for providing stored servo and user data state variables to sampled-data channel

Also Published As

Publication number Publication date
DE60218692D1 (en) 2007-04-19
EP1412940A2 (en) 2004-04-28
US20020176196A1 (en) 2002-11-28
EP1412940B1 (en) 2007-03-07
CN1305062C (en) 2007-03-14
DE60218692T2 (en) 2007-12-06
WO2002097799A2 (en) 2002-12-05
US6697204B2 (en) 2004-02-24
CN1531731A (en) 2004-09-22

Similar Documents

Publication Publication Date Title
EP0389261A3 (en) Compact-type device for reproducing data
EP0905692A3 (en) Signal Recording/reproducing apparatus and method
DE3482291D1 (en) DATA TRANSFER SYSTEM WITH DIGITAL DISK.
WO1993019466A3 (en) Computer disk drive integrated data path circuit optimized for handling both data and servo signals
EP0762417A3 (en) Signal recording and reproducing, signal record media and signal transmission and reception
EP0821358A3 (en) CD-ROM reproducing apparatus and method for controlling the same
EP1028415A3 (en) Rotation servo circuit in disk player
SU1103811A3 (en) Revising device for magnetic display/recording
WO2002097799A3 (en) Method and apparatus for operating a continuous time filter of a read/write channel for a hard disk drive
EP0777229A3 (en) Recording and/or reproducing apparatus and methods
MY112422A (en) Digital signal recording method and recording apparatus thereof
EP1288949A3 (en) Digital audio recording and playback apparatus
EP1635332A3 (en) Magnetic recording/reproducing apparatus and magnetic recording/reproducing method
JP2004039138A5 (en)
MY110464A (en) Recording/reproducing apparatus for disc-shaped recording medium
WO2003041059A1 (en) Recorder/reproducer
JPS55143682A (en) Read system for bar code information
JPS5680864A (en) Tape for doll operating command recorder
KR920018658A (en) Long time multichannel data tape recorder with data compression / extension
JPS5641504A (en) Information reproducing-recording device
JPS6348084A (en) Recorder
JPS5647936A (en) Cue signal recording and reproducing system
JPS5417709A (en) Changeover circuit of tape recorder
JPS55113104A (en) Magnetic recording and reproducing device
JPH03119400A (en) Sound recording and immediate reproduction system

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): CN JP KR

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
WWE Wipo information: entry into national phase

Ref document number: 028106652

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 2002737115

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 2002737115

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP

WWG Wipo information: grant in national office

Ref document number: 2002737115

Country of ref document: EP