• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An electromagnetic transducer (10) comprises two magnetoresistive elements (RH1, RH2) in a bridge circuit with two inductive components (L1, L2) The bridge carries a unidirectional bias current between input voltage terminals (VB, Vs)and magnetically induced variations in the current are manifested at Vo through a differential preamplifier. The inductive components are provided by cross-coupled gyrators (30, 34) each gyrator comprising a bipolar operational amplifier (31,33), a feedback resistor (32,36) and the two gyrators have a common coupling capacitor (38). At a steady D.C. level each gyrator provides a low impedance, almost short circuit path, to earth while for A.C. signals the gyrator provides a very high impedance amounting to an open circuit.
    公开号:SU1075997A3
    申请号:SU792825149
    申请日:1979-09-28
    公开日:1984-02-23
    发明作者:Левкович Юлиан
    申请人:Интернэшнл Бизнес Машинз Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to magnetic recording, in particular, devices for reproducing digital data from a magnetic recording medium. A device for reproducing digital data from a magnetic recording medium is known, comprising a reproducing magnetic head, made with a winding, the terminals of which are connected to an amplifier, . From the well-known device it is possible to ensure the reproduction of digital data from a magnetic recording medium with the relative simplicity of its design l. The drawback of the device consists in a significant dependence of the result of reproducing digital data on the speed of movement of the magnetic recording carrier relative to the reproducing magnetic head. It is also known device for. playback of digital data from a magnetic recording medium, containing a reproducing magnetic head, made with magnetoresistive thin-film elements, the new outputs of which are connected to the power bus, and the second leads to the inputs of the differential amplifier, resistors, a capacitor and a common bus. the independence of the reproduction of digital data on the speed of movement of the magnetic recording carrier relative to the reproducing magnetic head 2. - The disadvantages of the known device are its low sensitivity and considerable heat dissipation. This is due to the fact that the magnetoresistive thin-film elements are connected to the elements that have a small electrical resistance of direct and alternating current. The purpose of the invention is to increase the sensitivity and reduce heat dissipation. This goal is achieved in that a device for reproducing digital data from a magnetic recording medium, comprising a reproducing magnetic head, made with a maximal-resistive thin-film elements, the first terminals of which are connected to the power bus, and the second terminals to the inputs of the differential amplifier, resistors, a capacitor, and a common bus; there are entered gyrators made on operational amplifiers, the first inputs of which are connected to the second terminals of the magnetoresistive thin-film elements, and the outputs are connected through resistors with inputs of a differential amplifier made in the form of a bipolar operational amplifier, the second inputs of the operational amplifiers of the gyrators are connected to the common bus, and the control inputs are connected directly to the different terminals of the capacitor. The drawing shows one of the possible variants of the proposed device for reproducing digital data from a magnetic recording medium. The proposed device comprises a reproducing magnetic head 1, made with magnetoresistive thin-film elements 2, the first terminals of which are connected to the power supply bus 3, and the second leads to the inputs of the differential amplifier 4 connected by an output to the output bus 5. The device also contains gyrators made on the operational amplifier x 6, the first inputs of which are connected to the second terminals of the magnetoresistive thin-film elements 2 of the reproducing magnetic head 1. The second inputs of the operational amplifiers b d gi The rators are connected to the common bus 7. The control inputs of the operational amplifiers of the diodes are connected directly to the different terminals of the capacitor 8. The outputs of the operational amplifiers of the gyratoron are connected through resistors 9 to the inputs of the differential amplifier 4, made in the form of a bipolar operational amplifier. The reproduction of digital data from a magnetic recording medium by means of the device proposed is carried out as follows. During reproduction, the magnetic field of the magnetic recording medium acts on the magnetoresistive thin-film elements 2 of the reproducing magnetic head 1 ,. change the electrical resistance of the latter in accordance with the reproduced digital data. At the same time, the operational amplifiers of the gyrator modules provide transmission through the magnetoresistive thin-film elements 2 of the reproducing magnetic head 1 of a unidirectional electric current, the magnitude of which varies in accordance with the change in their electrical resistance. The resulting signal is fed to the inputs of the differential amplifier 4, and after amplification it goes to the output bus 5. The operational amplifiers of 6 gyrators with a slight loss of energy in them ensure the creation of such an electric current through the magnetoresistive thin-film elements 2
    J1075997
    reproducing magnetic head allows
    which ensures their operation in whether to increase the sensitivity and the reasonable part of the reproduction. to increase the heat dissipation during reproduction Using the invention the behavior of digital data from the carrier
    compared with the known device magnetic recording.
    权利要求:
    Claims (1)
    [1]
    DEVICE FOR PLAYING DIGITAL DATA FROM A MAGNETIC RECORDING MEDIA, containing a reproducing magnetic head made with magnetoresistive thin-film elements, the first terminals of which are connected to the power bus, and the second conclusions to the inputs of the differential amplifier, resistors, a capacitor and a common w that, in order to increase sensitivity and reduce heat dissipation, it introduced gyrators made on operational amplifiers, the first inputs of which are connected to the second conclusions of magnesium thin-resistive thin-film elements, and the outputs are connected through resistors to the inputs of a differential amplifier made in the form of a bipolar operational amplifier, with the second inputs of the operational amplifiers of the gyrators connected to a common bus, and the control inputs connected directly to different terminals of the capacitor.
    SU ,, "4075997
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1075997A3|1984-02-23|Device for playing-back digital data from magnetic record carrier
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    US2804506A|1957-08-27|Dynamagnetic pick-up system
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    JPS551611A|1980-01-08|Megnetic recording and reproducing device
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    同族专利:
    公开号 | 公开日
    EP0009531B1|1982-12-22|
    BR7906297A|1980-07-08|
    ES483738A1|1980-03-01|
    FI792821A|1980-03-30|
    EP0009531A1|1980-04-16|
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    AU526085B2|1982-12-16|
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    AT2102T|1983-01-15|
    US4191977A|1980-03-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3814863A|1972-10-11|1974-06-04|Ibm|Internally biased magnetoresistive magnetic transducer|
    US3860965A|1973-10-04|1975-01-14|Ibm|Magnetoresistive read head assembly having matched elements for common mode rejection|
    NL7405727A|1974-04-29|1975-10-31|Philips Nv|MAGNETO RESISTANCE CUP.|
    DE2615539C2|1975-04-14|1986-01-16|N.V. Philips' Gloeilampenfabrieken, Eindhoven|Magnetic head with magnetoresistive element|
    US4050086A|1976-05-06|1977-09-20|International Business Machines Corporation|Dynamic transducer biasing signal amplifying circuitry|
    US4075671A|1976-11-24|1978-02-21|International Business Machines Corporation|Automatic ac biasing of a magnetoresistive element|US4259703A|1978-06-20|1981-03-31|Emi Limited|Magneto resistive magnetic transducers|
    GB2037474B|1978-12-11|1983-08-24|Racal Recorders Ltd|Magneting recording and reproduction|
    US4492997A|1980-11-28|1985-01-08|Hitachi, Ltd.|Reproducing and amplifying circuit for magnetoresistive head|
    JPH0440776B2|1982-12-16|1992-07-06|Nippon Electric Co|
    US4712144A|1985-08-20|1987-12-08|International Business Machines Corporation|Method and apparatus for reading recorded data by a magnetoresistive head|
    US4786993A|1986-06-30|1988-11-22|International Business Machines Corporation|Voltage amplifier for constant voltage biasing and amplifying signals from a MR sensor|
    JPH0365180B2|1987-01-19|1991-10-09|
    US4903158A|1988-07-28|1990-02-20|Eastman Kodak Company|MR head with complementary easy axis permanent magnet|
    US4899240A|1988-07-28|1990-02-06|Eastman Kodak Company|Biasing for a UMR head|
    FR2665010B1|1990-07-20|1992-09-18|Thomson Csf|MAGNETIC READING DEVICE WITH MATRIX NETWORK OF READING HEADS.|
    JPH0669472B2|1991-01-25|1994-09-07|大阪瓦斯株式会社|Bathroom sauna system|
    US5309295A|1992-10-08|1994-05-03|International Business Machines Corporation|Method and apparatus for biasing a magneto-resistive head|
    US5327303A|1992-12-18|1994-07-05|Seagate Technology, Inc.|MR preamplifier having feedback loops for minimizing differential low frequency components and regulating common mode low frequency components of the preamplifier output signal|
    JPH06274805A|1993-03-19|1994-09-30|Hitachi Ltd|Read/write integrated circuit|
    JP3216943B2|1993-09-13|2001-10-09|株式会社日立製作所|Magnetic recording / reproducing device|
    US5426542A|1994-01-21|1995-06-20|Seagate Technology, Inc.|Electronically coupled high-impedance magnetoresistive preamplifier|
    US5914630A|1996-05-10|1999-06-22|Vtc Inc.|MR head preamplifier with output signal amplitude which is independent of head resistance|
    US5917680A|1996-06-24|1999-06-29|Read-Rite Corporation|Magnetoresistive head with magnetic bias level control|
    US6574061B1|1999-08-27|2003-06-03|Seagate Technology Llc|Method and apparatus for run-time temperature compensation of giant magnetoresistive head bias current|
    US6822817B2|2002-10-31|2004-11-23|International Business Machines Corporation|Preamplifier circuit suitable for use in magnetic storage devices|
    US7492166B2|2005-11-04|2009-02-17|Devore Timothy Gale|Method for determining the source equivalent inductance of an energized AC circuit|
    US9548721B1|2015-11-24|2017-01-17|King Fahd University Of Petroleum And Minerals|Floating immittance emulator|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/947,308|US4191977A|1978-09-29|1978-09-29|Biasing of magnetoresistive read head using gyrators|
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