JPS5792403A - Regenerative amplifying circuit for mr head - Google Patents

Regenerative amplifying circuit for mr head

Info

Publication number
JPS5792403A
JPS5792403A JP16655180A JP16655180A JPS5792403A JP S5792403 A JPS5792403 A JP S5792403A JP 16655180 A JP16655180 A JP 16655180A JP 16655180 A JP16655180 A JP 16655180A JP S5792403 A JPS5792403 A JP S5792403A
Authority
JP
Japan
Prior art keywords
head
resistance
circuit
constitution
amplifying circuit
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
JP16655180A
Other languages
Japanese (ja)
Other versions
JPH0325844B2 (en
Inventor
Takao Arai
Takaharu Noguchi
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP16655180A priority Critical patent/JPS5792403A/en
Priority to EP81109854A priority patent/EP0053343A1/en
Priority to US06/324,674 priority patent/US4492997A/en
Publication of JPS5792403A publication Critical patent/JPS5792403A/en
Publication of JPH0325844B2 publication Critical patent/JPH0325844B2/ja
Granted 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
    • G11B5/127—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
    • G11B5/3903—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 using magnetic thin film layers or their effects, the films being part of integrated structures
    • G11B5/3906—Details related to the use of magnetic thin film layers or to their effects
    • G11B5/3945—Heads comprising more than one sensitive element
    • 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
    • G11B20/24—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing noise
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Manufacturing & Machinery (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Magnetic Heads (AREA)

Abstract

PURPOSE:To simplify circuit constitution and to reduce noises by using an MR (Magnetoresistive) head as part of the feedback circuit of a regenerative amplifying circuit since the MR head is a resistance. CONSTITUTION:When the gain of the opened loop of a differential amplifying circuit 7 is much greater than that of the closed loop, a current is supplied to an MR head 5 through a resistance so that a voltage at a connection point between the resistance 23 and MR head 5 is equalized to that at a connection point between resistances 21 and 22. If the MR head 5 varies in resistance by an external magnetic field applied to the MR head 5, an output voltage proportional to the resistance variation of the MR head 5 is developed across the resistance 23. Further, only the resistance noise of the MR head 5 and the transistor noise of the circuit 7 are left as noise sources. Therefore, circuit constitution is simplified and noises are reduced with the constitution like this.
JP16655180A 1980-11-28 1980-11-28 Regenerative amplifying circuit for mr head Granted JPS5792403A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP16655180A JPS5792403A (en) 1980-11-28 1980-11-28 Regenerative amplifying circuit for mr head
EP81109854A EP0053343A1 (en) 1980-11-28 1981-11-24 Reproducing and amplifying circuit for magnetoresistive head
US06/324,674 US4492997A (en) 1980-11-28 1981-11-24 Reproducing and amplifying circuit for magnetoresistive head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16655180A JPS5792403A (en) 1980-11-28 1980-11-28 Regenerative amplifying circuit for mr head

Publications (2)

Publication Number Publication Date
JPS5792403A true JPS5792403A (en) 1982-06-09
JPH0325844B2 JPH0325844B2 (en) 1991-04-09

Family

ID=15833357

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16655180A Granted JPS5792403A (en) 1980-11-28 1980-11-28 Regenerative amplifying circuit for mr head

Country Status (1)

Country Link
JP (1) JPS5792403A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5930062A (en) * 1996-10-03 1999-07-27 Hewlett-Packard Company Actively stabilized magnetoresistive head

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5153843A (en) * 1974-11-06 1976-05-12 Nippon Kokan Kk KYORISOKUTEIHOHO
JPS551698A (en) * 1978-06-19 1980-01-08 Philips Nv Magnetic reading head

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5153843A (en) * 1974-11-06 1976-05-12 Nippon Kokan Kk KYORISOKUTEIHOHO
JPS551698A (en) * 1978-06-19 1980-01-08 Philips Nv Magnetic reading head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5930062A (en) * 1996-10-03 1999-07-27 Hewlett-Packard Company Actively stabilized magnetoresistive head

Also Published As

Publication number Publication date
JPH0325844B2 (en) 1991-04-09

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