FR2372475A1 - Procede et circuits pour la lecture d'informations magnetiques a l'aide d'elements magnetoresistifs - Google Patents

Procede et circuits pour la lecture d'informations magnetiques a l'aide d'elements magnetoresistifs

Info

Publication number
FR2372475A1
FR2372475A1 FR7729886A FR7729886A FR2372475A1 FR 2372475 A1 FR2372475 A1 FR 2372475A1 FR 7729886 A FR7729886 A FR 7729886A FR 7729886 A FR7729886 A FR 7729886A FR 2372475 A1 FR2372475 A1 FR 2372475A1
Authority
FR
France
Prior art keywords
magnetoresistive elements
magnetic information
bridge
circuits
reading magnetic
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
FR7729886A
Other languages
English (en)
Other versions
FR2372475B1 (fr
Inventor
Samuel D Cheatham
Julian Lewkowicz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of FR2372475A1 publication Critical patent/FR2372475A1/fr
Application granted granted Critical
Publication of FR2372475B1 publication Critical patent/FR2372475B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/0007—Circuits or methods for reducing noise, for correction of distortion, or for changing density of recorded information
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
    • G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B2005/0002—Special dispositions or recording techniques
    • G11B2005/0005—Arrangements, methods or circuits
    • G11B2005/001—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure
    • G11B2005/0013—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation
    • G11B2005/0016—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation of magnetoresistive transducers
    • G11B2005/0018—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation of magnetoresistive transducers by current biasing control or regulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Multimedia (AREA)
  • Measuring Magnetic Variables (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Magnetic Heads (AREA)

Abstract

Circuit de lecture d'informations magnétiques utilisant des éléments magnétorésistifs. Le circuit comporte deux éléments magnétorésistifs ZH1 et ZH2 montés en pont avec deux impédances assorties Z1 et Z2. Une source de polarisation à courant alternatif 2' est couplée à l'entrée du pont. Un circuit de détection 12 détecte les crêtes des signaux à la sortie 8 du pont et les envoie à un condensateur 10 dont la tension aux bornes représente ainsi la valeur moyenne des signaux. Une tension continue variable correspondant à ladite valeur moyenne est ré-injectée sur la source 2 afin de régler l'amplitude du signal de polarisation.
FR7729886A 1976-11-24 1977-09-29 Procede et circuits pour la lecture d'informations magnetiques a l'aide d'elements magnetoresistifs Granted FR2372475A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/744,839 US4075671A (en) 1976-11-24 1976-11-24 Automatic ac biasing of a magnetoresistive element

Publications (2)

Publication Number Publication Date
FR2372475A1 true FR2372475A1 (fr) 1978-06-23
FR2372475B1 FR2372475B1 (fr) 1980-06-27

Family

ID=24994165

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7729886A Granted FR2372475A1 (fr) 1976-11-24 1977-09-29 Procede et circuits pour la lecture d'informations magnetiques a l'aide d'elements magnetoresistifs

Country Status (5)

Country Link
US (1) US4075671A (fr)
JP (1) JPS5858722B2 (fr)
DE (1) DE2748351A1 (fr)
FR (1) FR2372475A1 (fr)
GB (1) GB1545997A (fr)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7806568A (nl) * 1978-06-19 1979-12-21 Philips Nv Magnetoweerstand leeskop.
US4259703A (en) * 1978-06-20 1981-03-31 Emi Limited Magneto resistive magnetic transducers
US4191977A (en) * 1978-09-29 1980-03-04 International Business Machines Corporation Biasing of magnetoresistive read head using gyrators
JPS55129910A (en) * 1979-03-27 1980-10-08 Sharp Corp Magnetic signal reproducing device
FR2458817A1 (fr) * 1979-06-06 1981-01-02 Commissariat Energie Atomique Procede de surveillance de l'etat instantane d'un circuit electrique et notamment de detection d'une rupture de ce circuit
US4517515A (en) * 1981-06-03 1985-05-14 The United States Of America As Represented By The Secretary Of The Navy Magnetometer with a solid-state magnetic-field sensing means
US4504787A (en) * 1982-04-05 1985-03-12 Honeywell Inc. Electronic watthour meter
JPS6157011A (ja) * 1984-08-27 1986-03-22 Sony Corp 磁気抵抗効果型磁気ヘツド装置
JPS63298801A (ja) * 1987-05-29 1988-12-06 Hitachi Ltd バイアス電圧制御回路
US5243686A (en) * 1988-12-09 1993-09-07 Oki Electric Industry Co., Ltd. Multi-stage linear predictive analysis method for feature extraction from acoustic signals
US5483162A (en) * 1991-10-30 1996-01-09 Sankyo Saiki Mfg. Co., Ltd. Magnetic detector for a frequency generator responsive to motor rotation
US5402064A (en) * 1992-09-02 1995-03-28 Santa Barbara Research Center Magnetoresistive sensor circuit with high output voltage swing and temperature compensation
US5512818A (en) * 1994-03-31 1996-04-30 At&T Corp. Voltage proportional replication device using magnetoresistive sensing elements
US5661614A (en) * 1994-05-31 1997-08-26 International Business Machines Corporation Method and apparatus for error recovery for unstable magnetorestrictive heads
US5497111A (en) * 1994-12-22 1996-03-05 International Business Machines Corporation Peak detection circuit for suppressing magnetoresistive thermal asperity transients in a data channel
US5831426A (en) * 1996-08-16 1998-11-03 Nonvolatile Electronics, Incorporated Magnetic current sensor
US5936400A (en) * 1996-12-23 1999-08-10 Federal Products Co. Magnetoresistive displacement sensor and variable resistor using a moving domain wall
US6025979A (en) * 1997-09-04 2000-02-15 Oki Electric Industry Co., Ltd. Magnetoresistive sensor and head with alternating magnetic bias field
EP0973153B1 (fr) * 1998-07-17 2007-02-14 Koninklijke Philips Electronics N.V. Dispositif de lecture d'informations magnétiques
US6445519B1 (en) 1999-04-21 2002-09-03 Seagate Technology Llc Basline instability detector
DE19922129C1 (de) * 1999-05-12 2000-09-28 Siemens Ag Verfahren und Vorrichtung zur logischen Verknüpfung von Signalen auf magnetischer Basis
US6574061B1 (en) 1999-08-27 2003-06-03 Seagate Technology Llc Method and apparatus for run-time temperature compensation of giant magnetoresistive head bias current
US6949927B2 (en) * 2001-08-27 2005-09-27 International Rectifier Corporation Magnetoresistive magnetic field sensors and motor control devices using same
US20030193731A1 (en) * 2002-04-11 2003-10-16 Texas Instruments Incorporated Balanced MR head bias technique for magneto-resistive preamplifier operating in a single supply environment
US6847501B2 (en) * 2002-11-06 2005-01-25 International Business Machines Corporation Method and apparatus for providing matched differential MR biasing and pre-amplification
US7436632B2 (en) * 2004-06-30 2008-10-14 Seagate Technology Llc Differential/dual CPP recording head
US7557562B2 (en) * 2004-09-17 2009-07-07 Nve Corporation Inverted magnetic isolator
US7348845B2 (en) * 2005-05-19 2008-03-25 Roberto Michele Giovannotto System and method for employing variable magnetic flux bias in an amplifier
US7423826B2 (en) * 2006-03-10 2008-09-09 Seagate Technology Llc Readback system providing a combined sample output including multiple samples per bit
JP2009229112A (ja) * 2008-03-19 2009-10-08 Tdk Corp 電圧検出回路
US9506997B2 (en) * 2010-05-14 2016-11-29 Hitachi, Ltd. Magnetic-field-angle measurement apparatus and rotational-angle measurement apparatus using same
JP6370173B2 (ja) * 2014-09-03 2018-08-08 日本電産サンキョー株式会社 Ｍｒセンサおよびカードリーダ

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1371475A (fr) * 1963-09-26 1964-09-04 Thomson Houston Comp Francaise Perfectionnements aux procédés d'enregistrement magnétique
DE2407669A1 (de) * 1973-02-20 1974-08-29 Matsshita Electric Ind Co Magnetkopf
US3840756A (en) * 1973-02-05 1974-10-08 Honeywell Inf Systems Gain control circuit using sample and hold feedback
US3979600A (en) * 1974-11-14 1976-09-07 Rockwell International Corporation Sense circuit arrangement

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2816175A (en) * 1952-04-26 1957-12-10 Rca Corp Magnetic compression method
US2828478A (en) * 1955-05-09 1958-03-25 John T Mullin Phasing system for multiple track recording

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1371475A (fr) * 1963-09-26 1964-09-04 Thomson Houston Comp Francaise Perfectionnements aux procédés d'enregistrement magnétique
US3840756A (en) * 1973-02-05 1974-10-08 Honeywell Inf Systems Gain control circuit using sample and hold feedback
DE2407669A1 (de) * 1973-02-20 1974-08-29 Matsshita Electric Ind Co Magnetkopf
US3979600A (en) * 1974-11-14 1976-09-07 Rockwell International Corporation Sense circuit arrangement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NV700/73 *

Also Published As

Publication number Publication date
DE2748351A1 (de) 1978-06-01
JPS5365709A (en) 1978-06-12
JPS5858722B2 (ja) 1983-12-27
US4075671A (en) 1978-02-21
FR2372475B1 (fr) 1980-06-27
GB1545997A (en) 1979-05-16

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Legal Events

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