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    METHOD AND APPARATUS FOR READING RECORDED DATA BY A MAGNETORESISTIVE HEAD
    2.
    发明专利
    METHOD AND APPARATUS FOR READING RECORDED DATA BY A MAGNETORESISTIVE HEAD 未知

    公开(公告)号：CA1254298A

    公开(公告)日：1989-05-16

    申请号：CA510696

    申请日：1986-06-03

    Applicant: IBM

    Inventor： KLAASSEN KLAAS B

    IPC: G11B5/39 ,  G01R33/09 ,  G11B5/02

    Abstract: Of The Invention METHOD AND APPARATUS FOR READING RECORDED DATA BY A MAGNETORESISTIVE HEAD Method and apparatus for magnetoresistive (MR) head biasing and output signal detection for reading data recorded in magnetic media. The MR head may be biased by constant current or constant voltage, and an output signal, proportional to the ratio of the instantaneous value of the change in MR head resistance to total MR head resistance when exposed to the magnetic field of the media, is detected.

    METHOD AND CIRCUITRY TO SUPPRESS ADDITIVE DISTURBANCES IN DATA CHANNELS CONTAINING MAGNETO-RESISTIVE SENSORS
    4.
    发明专利
    METHOD AND CIRCUITRY TO SUPPRESS ADDITIVE DISTURBANCES IN DATA CHANNELS CONTAINING MAGNETO-RESISTIVE SENSORS 未知

    公开(公告)号：CA1330832C

    公开(公告)日：1994-07-19

    申请号：CA600082

    申请日：1989-05-18

    Applicant: IBM

    Inventor： JOVE STEPHEN A ,  KLAASSEN KLAAS B ,  VAN PEPPEN JACOBUS C L

    IPC: G11B5/09 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/40 ,  G11B19/04 ,  G11B20/00 ,  G11B20/22 ,  G11B33/10

    Abstract: A method and circuitry are disclosed for suppressing additive transient disturbances in a data channel; e.g., due to thermal transients caused by a magneto-resistive (MR) transducer contacting moving a storage surface. Positive and negative envelope detectors each have their inputs connected to the channel, and provide respective outputs which are summed and contain an envelope component and a residue component. A buffer interconnects the detectors to allow both detectors to follow rapid positive excursions of the data channel signal. A nonlinear signal-adaptive filter is connected to the summed output to further reduce the residue component. The data channel signal (or preferably the output from a delay means connected to the channel) is summed with the output from the filter. The relative amplitudes of these two outputs is set such that the resulting summed output signal is free of additive disturbances.

    VOLTAGE AMPLIFIER FOR CONSTANT VOLTAGE BIASING AND AMPLIFYING SIGNALS FROM A MR SENSOR
    5.
    发明专利
    VOLTAGE AMPLIFIER FOR CONSTANT VOLTAGE BIASING AND AMPLIFYING SIGNALS FROM A MR SENSOR 未知

    公开(公告)号：CA1326072C

    公开(公告)日：1994-01-11

    申请号：CA534767

    申请日：1987-04-15

    Applicant: IBM

    Inventor： JOVE STEPHEN A ,  KLAASSEN KLAAS B ,  NOMURA CALVIN S ,  VAN PEPPEN JACOBUS C L

    IPC: G01R33/09 ,  G11B5/00 ,  G11B5/02

    Abstract: VOLTAGE AMPLIFIER FOR CONSTANT VOLTAGE BIASING AND AMPLIFYING SIGNALS FROM A MR SENSOR An amplifier for voltage biasing and amplifying the signals produced by a magnetic sensor is provided. Electrically, the resistance of the sensor is disposed between the bases of a differential pair comprising the input stage of the amplifier. Constant bias voltage for the sensor is provided independently of sensor resistance. DC feedback to the input stage balances current flow in both paths of the differential input stage to correct for DC offset arising in the output from input stage emitter resistor. The amplified signal, representing ?Rh/Rh, is sensed as a voltage across the magnetoresistive sensor, where .DELTA.RH the change in steady-state resistance, Rh, of the sensor.

    AMPLIFICATION OF SIGNALS PRODUCED BY A CURRENT BIASED MAGNETORESISTIVE SENSOR
    6.
    发明专利
    AMPLIFICATION OF SIGNALS PRODUCED BY A CURRENT BIASED MAGNETORESISTIVE SENSOR 未知

    公开(公告)号：CA1268223A

    公开(公告)日：1990-04-24

    申请号：CA532246

    申请日：1987-03-17

    Applicant: IBM

    Inventor： JOVE STEPHEN A ,  KLAASSEN KLAAS B

    IPC: G01R33/06 ,  G01R33/09 ,  G11B5/00 ,  G11B5/02 ,  G11B5/39 ,  G11B19/02

    Abstract: AMPLIFICATION OF SIGNALS PRODUCED BY A CURRENT BIASED MAGNETORESISTIVE SENSOR A transimpedance amplifier for biasing and amplifying the signals produced by a magnetoresistive element is provided. Electrically, the resistance of the element is disposed as degenerative feedback in the emitter circuit of a differential pair comprising the input stage of the amplifier. Bias current for the element is supplied by the same current source that supplies current to the differential pair. DC feedback to the input stage balances current flow in both paths of the differential input stage to correct for DC offset arising in the output from variations transistor characteristics and the steady-state value of the magnetoresistive element. The amplified signal, representing .DELTA.Rh/Rh, is sensed as a current through the magnetoresistive element, where .DELTA.Rh is the change in steady-state resistance, Rh, of the element.

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