JPS57147109A - Write-in circuit - Google Patents

Write-in circuit

Info

Publication number
JPS57147109A
JPS57147109A JP3207481A JP3207481A JPS57147109A JP S57147109 A JPS57147109 A JP S57147109A JP 3207481 A JP3207481 A JP 3207481A JP 3207481 A JP3207481 A JP 3207481A JP S57147109 A JPS57147109 A JP S57147109A
Authority
JP
Japan
Prior art keywords
current
write
circuit
data
switched
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.)
Pending
Application number
JP3207481A
Other languages
Japanese (ja)
Inventor
Michio Matsuura
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP3207481A priority Critical patent/JPS57147109A/en
Publication of JPS57147109A publication Critical patent/JPS57147109A/en
Pending legal-status Critical Current

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Digital Magnetic Recording (AREA)

Abstract

PURPOSE:To obtain a simple write-in circuit, by providing a circuit supplying a polarity switching signal of a write-in current to an input terminal of each transistor (TR) and a logical circuit applying a current value switching signal to a current control input terminal of a current source circuit, in response to write-in and bias data externally. CONSTITUTION:In TRs Q3, Q5 and Q4, Q6, normally only one pair is conductive, and when the TRQ5 or Q6 turns on, the base potential of a TRQ1 or Q2 for current supply is lowered and the Q1 or the Q2 turns off. Thus, in response to an input signal HD, a write-in current is switched through the path of the Q1, a head and the Q4 and the path of the Q2, a head and the Q3. TRs Q7 and Q8 are used for current setting and the current value is switched with a TRQ9. The polarity of the magnetic head for the write-in current is set with a set write-in current and a bias current, so that the current coincides with a write-in data WD or a bias data BD, and the amplitude is switched with the exclusive logical sum of both the data.
JP3207481A 1981-03-06 1981-03-06 Write-in circuit Pending JPS57147109A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3207481A JPS57147109A (en) 1981-03-06 1981-03-06 Write-in circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3207481A JPS57147109A (en) 1981-03-06 1981-03-06 Write-in circuit

Publications (1)

Publication Number Publication Date
JPS57147109A true JPS57147109A (en) 1982-09-10

Family

ID=12348724

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3207481A Pending JPS57147109A (en) 1981-03-06 1981-03-06 Write-in circuit

Country Status (1)

Country Link
JP (1) JPS57147109A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62266706A (en) * 1986-05-15 1987-11-19 Hitachi Ltd Recoding current driving circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62266706A (en) * 1986-05-15 1987-11-19 Hitachi Ltd Recoding current driving circuit

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