WO1993019466A3 - Computer disk drive integrated data path circuit optimized for handling both data and servo signals - Google Patents

Computer disk drive integrated data path circuit optimized for handling both data and servo signals Download PDF

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Publication number
WO1993019466A3
WO1993019466A3 PCT/US1993/002553 US9302553W WO9319466A3 WO 1993019466 A3 WO1993019466 A3 WO 1993019466A3 US 9302553 W US9302553 W US 9302553W WO 9319466 A3 WO9319466 A3 WO 9319466A3
Authority
WO
WIPO (PCT)
Prior art keywords
data
read
handling
data path
disk drive
Prior art date
Application number
PCT/US1993/002553
Other languages
French (fr)
Other versions
WO1993019466A2 (en
Inventor
Corey D Petersen
Original Assignee
Int Microelectronic Products
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 Int Microelectronic Products filed Critical Int Microelectronic Products
Priority to JP5516749A priority Critical patent/JPH07509334A/en
Priority to DE69304900T priority patent/DE69304900D1/en
Priority to EP93908440A priority patent/EP0631686B1/en
Priority to BR9306107A priority patent/BR9306107A/en
Publication of WO1993019466A2 publication Critical patent/WO1993019466A2/en
Publication of WO1993019466A3 publication Critical patent/WO1993019466A3/en
Priority to KR1019940703253A priority patent/KR950701120A/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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/3026—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being discontinuously variable, e.g. controlled by switching
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/01—Shaping pulses
    • H03K5/08—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding
    • H03K5/082—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding with an adaptive threshold
    • H03K5/084—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding with an adaptive threshold modified by switching, e.g. by a periodic signal or by a signal in synchronism with the transitions of the output signal
    • 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
    • G11B2020/1087—Digital recording or reproducing wherein a selection is made among at least two alternative ways of processing
    • 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
    • G11B2020/1087—Digital recording or reproducing wherein a selection is made among at least two alternative ways of processing
    • G11B2020/10888—Digital recording or reproducing wherein a selection is made among at least two alternative ways of processing the kind of data being the selection criterion
    • 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
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
    • G11B2020/1265—Control data, system data or management information, i.e. data used to access or process user data
    • G11B2020/1281—Servo information
    • G11B2020/1282—Servo information in embedded servo fields

Abstract

An integrated circuit adapted for use in a data path of a disk storage system of a type wherein data is recorded at different rates depending upon the storage track of the data and includes servo bursts of head positioning signals disbursed throughout the data on all of the tracks. The circuit includes a variable cut off low pass filter (55) that is adjusted both for the rate of data being read and for the rate of the servo bursts when being read. An automatic gain control (51) and a pulse detector (63) are similarly dynamically adjusted in characteristics to fit that of the data and servo bursts when each is being read from the disk. An output of the filter provides both read data and head positioning signals. A write data path (39, 79, 35) is also provided as part of the circuit.
PCT/US1993/002553 1992-03-18 1993-03-16 Computer disk drive integrated data path circuit optimized for handling both data and servo signals WO1993019466A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP5516749A JPH07509334A (en) 1992-03-18 1993-03-16 Integrated datapath circuit for computer disk drives optimized for data and servo signal manipulation
DE69304900T DE69304900D1 (en) 1992-03-18 1993-03-16 INTEGRATED DATA PATH CIRCUIT FOR A COMPUTER'S DISK DRIVE, OPTIMIZED FOR THE HANDLING OF BOTH DATA AND SERVO SIGNALS
EP93908440A EP0631686B1 (en) 1992-03-18 1993-03-16 Computer disk drive integrated data path circuit optimized for handling both data and servo signals
BR9306107A BR9306107A (en) 1992-03-18 1993-03-16 Electronic circuit set of data storage system unit and variable gain amplifier
KR1019940703253A KR950701120A (en) 1992-03-18 1994-09-16 Computer Disk Drive Integrated Data Path Circuit Optimized for Handling Both Data and Servo Signals

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US85231492A 1992-03-18 1992-03-18
US07/852,314 1992-03-18
US90271692A 1992-06-23 1992-06-23
US07/902,716 1992-06-23
US08/011,191 US5463603A (en) 1992-03-18 1993-01-29 Computer disk drive integrated data path circuit optimized for handling both data and servo signals
US08/011,191 1993-01-29

Publications (2)

Publication Number Publication Date
WO1993019466A2 WO1993019466A2 (en) 1993-09-30
WO1993019466A3 true WO1993019466A3 (en) 1993-11-11

Family

ID=27359384

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/002553 WO1993019466A2 (en) 1992-03-18 1993-03-16 Computer disk drive integrated data path circuit optimized for handling both data and servo signals

Country Status (8)

Country Link
US (1) US5463603A (en)
EP (1) EP0631686B1 (en)
JP (1) JPH07509334A (en)
KR (1) KR950701120A (en)
AU (1) AU3926293A (en)
BR (1) BR9306107A (en)
DE (1) DE69304900D1 (en)
WO (1) WO1993019466A2 (en)

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US5587975A (en) * 1994-10-24 1996-12-24 Sony Corporation Magneto-optical disk reproducing apparatus with gain and offset controlled by a reference pattern read from the disk
US6026190A (en) * 1994-10-31 2000-02-15 Intel Corporation Image signal encoding with variable low-pass filter
KR100282936B1 (en) * 1994-12-24 2001-03-02 윤종용 Data Detection Level Adjustment Circuit for Signal Processing in Disk Drive
JPH08212736A (en) * 1995-02-02 1996-08-20 Toshiba Corp Servo signal detector for magnetic disk apparatus and servo signal detecting method
US5764007A (en) * 1995-04-20 1998-06-09 Texas Instruments Incorporated Micro-processor based motor control integrated circuit including a boost regulated DC-to-DC converter
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
EP0763887B1 (en) * 1995-09-14 2000-03-22 STMicroelectronics S.r.l. Circuit for automatically regulating the gain of a differential amplifier
US5625267A (en) * 1995-12-13 1997-04-29 Coburn Optical Industries, Inc. Constant delay filtering for synchronized motion on multiple axes
US5859739A (en) * 1996-05-01 1999-01-12 International Business Machines Corporation Magnetic data reading apparatus and method using inductive and magnetoresistive heads
US6172828B1 (en) * 1996-05-16 2001-01-09 Hitachi, Ltd. Signal processing apparatus and a disk control apparatus, with head positioning control based on digitized servo data
JP3506565B2 (en) * 1996-07-22 2004-03-15 富士通株式会社 AGC circuit of disk storage device
EP0831480B1 (en) * 1996-09-24 2001-08-08 Hewlett-Packard Company, A Delaware Corporation Data processing apparatus and methods
US6411452B1 (en) 1997-03-11 2002-06-25 Western Digital Technologies, Inc. Disk drive employing read error tolerant sync mark detection
US5831888A (en) * 1997-05-21 1998-11-03 Texas Instruments Incorporated Automatic gain control circuit and method
CN1236504A (en) * 1997-06-03 1999-11-24 皇家菲利浦电子有限公司 Automatic gain control circuit, e. g. for use in a hard disk drive
JP3789204B2 (en) * 1997-06-09 2006-06-21 富士通株式会社 Magnetic disk unit
US6138201A (en) * 1998-04-15 2000-10-24 Sony Corporation Redundant array of inexpensive tape drives using data compression and data allocation ratios
US6268972B1 (en) 1998-09-18 2001-07-31 International Business Machines Corporation Method for measuring relative and absolute amplitudes of a signal read from a data storage medium
US6441983B1 (en) * 1998-10-02 2002-08-27 International Business Machines Corporation System and method for adjusting a cutoff frequency of a tunable filter employed in a read channel of a data storage system
US6272103B1 (en) * 1998-10-28 2001-08-07 Hewlett-Packard Co Signal attenuation using a filter-limiter connection with a threshold setting network
US6282038B1 (en) * 1999-02-19 2001-08-28 International Business Machines Corporation Variable gain amplifier with temperature compensation for use in a disk drive system
US6384998B1 (en) * 1999-08-17 2002-05-07 International Business Machines Corporation Multiplexing servo tracking signals in a disk drive
US7397622B1 (en) * 2000-05-12 2008-07-08 Maxtor Corporation Method and apparatus for improving servo stability in read heads while writing
US6469856B1 (en) 2000-05-12 2002-10-22 International Business Machines Corporation System and method for calibrating a corner frequency of a tunable filter employed in a read channel of a data storage system
US6747824B1 (en) * 2000-05-26 2004-06-08 Hitachi Global Storage Technologies Netherlands, B.V. Method and apparatus for head crash predictive failure analysis based upon slider track misregistration measurement using the readback signal
US6429988B1 (en) * 2000-09-22 2002-08-06 International Business Machines Corporation System and method for calibrating a corner frequency of a tunable filter using ADC code difference method
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US6697204B2 (en) * 2001-05-25 2004-02-24 Infineon Technologies Ag Method and apparatus for operating a continuous time filter of a read/write channel for a hard disk drive
GB2377317B (en) * 2001-07-07 2004-09-08 Hewlett Packard Co A data read channel and method of controlling the same
US7254172B1 (en) * 2002-04-04 2007-08-07 Cirrus Logic, Inc Filter control for varying data rate communication channels
TWI295464B (en) * 2003-08-22 2008-04-01 Mediatek Inc Control circuit for an optical pickup head in a disk drive
JP3874116B2 (en) * 2003-09-18 2007-01-31 ソニー株式会社 Optical disc reproducing apparatus and offset adjusting method
EP1641116A1 (en) * 2004-09-27 2006-03-29 STMicroelectronics S.r.l. Reduced hardware control circuit device with current loop for broad band hard disk drive applications
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Also Published As

Publication number Publication date
EP0631686A1 (en) 1995-01-04
DE69304900D1 (en) 1996-10-24
BR9306107A (en) 1997-11-18
EP0631686B1 (en) 1996-09-18
KR950701120A (en) 1995-02-20
JPH07509334A (en) 1995-10-12
WO1993019466A2 (en) 1993-09-30
US5463603A (en) 1995-10-31
AU3926293A (en) 1993-10-21

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