WO1995035563A3 - Arrangement comprising a magnetic write head, and write amplifier with capacitive current compensation - Google Patents

Arrangement comprising a magnetic write head, and write amplifier with capacitive current compensation Download PDF

Info

Publication number
WO1995035563A3
WO1995035563A3 PCT/IB1995/000431 IB9500431W WO9535563A3 WO 1995035563 A3 WO1995035563 A3 WO 1995035563A3 IB 9500431 W IB9500431 W IB 9500431W WO 9535563 A3 WO9535563 A3 WO 9535563A3
Authority
WO
WIPO (PCT)
Prior art keywords
write
write head
amplifier
current
arrangement
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.)
Ceased
Application number
PCT/IB1995/000431
Other languages
French (fr)
Other versions
WO1995035563A2 (en
Inventor
Johannes Otto Voorman
Hendrik Jan Pothast
Ho Wai Wong-Lam
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.)
Koninklijke Philips NV
Philips Norden AB
Original Assignee
Philips Electronics NV
Philips Norden AB
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 Philips Electronics NV, Philips Norden AB filed Critical Philips Electronics NV
Priority to HK98114121.6A priority Critical patent/HK1013164B/en
Priority to JP50188096A priority patent/JP3773256B2/en
Priority to AT95918709T priority patent/ATE198385T1/en
Priority to EP95918709A priority patent/EP0764320B1/en
Priority to DE69519731T priority patent/DE69519731T2/en
Publication of WO1995035563A2 publication Critical patent/WO1995035563A2/en
Publication of WO1995035563A3 publication Critical patent/WO1995035563A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/09—Digital recording
    • 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
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
    • H03F3/4508—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using bipolar transistors as the active amplifying circuit
    • H03F3/45085—Long tailed pairs
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/72—Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
    • 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
    • G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Digital Magnetic Recording (AREA)
  • Amplifiers (AREA)
  • Magnetic Heads (AREA)

Abstract

A recording apparatus including a magnetic write head and a write amplifier with capacitive current compensation. The write amplifier is made up of four current mirrors which are turned on two at a time by two switchable floating current sources connected between the input terminals of the current mirrors in order to produce a write current of alternating polarity through the write head. The parasitic capacitances across the write head and/or the parasitic capacitances of the write amplifier at the write terminals are neutralized by means of neutralizing capacitors. The high impedance at the terminals of the write head enables the common-mode voltage across the write head to be fixed at any desired voltage value by means of a common-mode circuit.
PCT/IB1995/000431 1994-06-10 1995-06-06 Arrangement comprising a magnetic write head, and write amplifier with capacitive current compensation Ceased WO1995035563A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
HK98114121.6A HK1013164B (en) 1994-06-10 1995-06-06 Arrangement comprising a magnetic write head, and write amplifier with capacitive current compensation
JP50188096A JP3773256B2 (en) 1994-06-10 1995-06-06 Apparatus comprising a magnetic write head and a write amplifier having capacitive current compensation
AT95918709T ATE198385T1 (en) 1994-06-10 1995-06-06 ARRANGEMENT WITH MAGNETIC WRITE HEAD AND WRITING AMPLIFIER WITH CAPACITIVE CURRENT COMPENSATION
EP95918709A EP0764320B1 (en) 1994-06-10 1995-06-06 Arrangement comprising a magnetic write head, and write amplifier with capacitive current compensation
DE69519731T DE69519731T2 (en) 1994-06-10 1995-06-06 ARRANGEMENT WITH MAGNETIC WRITING HEAD AND WRITING AMPLIFIER WITH CAPACITIVE CURRENT COMPENSATION

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP94201659.3 1994-06-10
EP94201659 1994-06-10

Publications (2)

Publication Number Publication Date
WO1995035563A2 WO1995035563A2 (en) 1995-12-28
WO1995035563A3 true WO1995035563A3 (en) 1996-02-01

Family

ID=8216939

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1995/000431 Ceased WO1995035563A2 (en) 1994-06-10 1995-06-06 Arrangement comprising a magnetic write head, and write amplifier with capacitive current compensation

Country Status (7)

Country Link
US (1) US5790336A (en)
EP (1) EP0764320B1 (en)
JP (1) JP3773256B2 (en)
KR (1) KR100376025B1 (en)
AT (1) ATE198385T1 (en)
DE (1) DE69519731T2 (en)
WO (1) WO1995035563A2 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997019445A1 (en) * 1995-11-21 1997-05-29 Philips Electronics N.V. Arrangement comprising a magnetic write head, and write amplifier with capacitive feed-forward compensation
FR2757986A1 (en) * 1996-12-31 1998-07-03 Philips Electronics Nv INTEGRATED MAGNETIC INFORMATION READING SYSTEM
US6301068B1 (en) * 1998-07-02 2001-10-09 Seagate Technology Llc Programmable write current waveform for high frequency magnetic recording
US6246533B1 (en) * 1998-07-13 2001-06-12 Agilent Technologies, Inc. Programmable write driver circuit for writing information to a magnetic storage media
GB2368713B (en) * 1998-07-13 2002-11-06 Hewlett Packard Co A write driver circuit
US6366421B2 (en) * 1998-12-17 2002-04-02 Texas Instruments Incorporated Adjustable writer overshoot for a hard disk drive write head
US6275092B1 (en) * 1999-11-16 2001-08-14 Texas Instruments Incorporated Active damping circuit
US6512649B1 (en) * 2000-08-30 2003-01-28 Stmicroelectronics, Inc. Method for differentially writing to a memory disk
US6671113B2 (en) 2001-03-06 2003-12-30 International Business Machines Corporation Characteristically terminated write driver with compensation for magnetic response and method therefor
US6650494B2 (en) * 2001-06-08 2003-11-18 Agere Systems Inc. Magnetic write circuit with charge pumping capacitors
US7119990B2 (en) * 2002-05-30 2006-10-10 Komag, Inc. Storage device including a center tapped write transducer
US6857937B2 (en) * 2002-05-30 2005-02-22 Komag, Inc. Lapping a head while powered up to eliminate expansion of the head due to heating
US7006313B2 (en) * 2002-06-25 2006-02-28 Texas Instruments Incorporated Circuit and method to match common mode flex impedance and to achieve symmetrical switching voltage outputs of write driver
US7133234B2 (en) * 2003-07-08 2006-11-07 Texas Instruments Incorporated Hard disk drive preamplifier write driver
US7746590B2 (en) 2004-10-06 2010-06-29 Agere Systems Inc. Current mirrors having fast turn-on time
US11165456B2 (en) * 2018-04-03 2021-11-02 Semiconductor Components Industries, Llc Methods and apparatus for a continuous time linear equalizer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5287231A (en) * 1992-10-06 1994-02-15 Vtc Inc. Write circuit having current mirrors between predriver and write driver circuits for maximum head voltage swing
US5296975A (en) * 1992-10-09 1994-03-22 International Business Machines Corporation High-transition-rate, low-supply-voltage write driver circuitry for magnetic inductive write head
US5345346A (en) * 1993-03-30 1994-09-06 Vtc Inc. Positive feedback low input capacitance differential amplifier
US5386328A (en) * 1993-06-18 1995-01-31 Silicon Systems, Inc. Current mirror based write driver

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4551772A (en) * 1984-03-28 1985-11-05 Storage Technology Corporation Write drive with current mirrors which reduce feed-through
JPH088485B2 (en) * 1992-10-02 1996-01-29 インターナショナル・ビジネス・マシーンズ・コーポレイション Differential output circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5287231A (en) * 1992-10-06 1994-02-15 Vtc Inc. Write circuit having current mirrors between predriver and write driver circuits for maximum head voltage swing
US5296975A (en) * 1992-10-09 1994-03-22 International Business Machines Corporation High-transition-rate, low-supply-voltage write driver circuitry for magnetic inductive write head
US5345346A (en) * 1993-03-30 1994-09-06 Vtc Inc. Positive feedback low input capacitance differential amplifier
US5386328A (en) * 1993-06-18 1995-01-31 Silicon Systems, Inc. Current mirror based write driver

Also Published As

Publication number Publication date
WO1995035563A2 (en) 1995-12-28
US5790336A (en) 1998-08-04
DE69519731T2 (en) 2001-07-05
JP3773256B2 (en) 2006-05-10
EP0764320B1 (en) 2000-12-27
KR100376025B1 (en) 2003-08-14
EP0764320A2 (en) 1997-03-26
ATE198385T1 (en) 2001-01-15
DE69519731D1 (en) 2001-02-01
HK1013164A1 (en) 1999-08-13
JPH10501645A (en) 1998-02-10

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