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    31.
    发明专利
    未知

    公开(公告)号：DE68914075D1

    公开(公告)日：1994-04-28

    申请号：DE68914075

    申请日：1989-09-20

    Applicant: IBM

    Inventor： JOVE STEPHEN ALAN ,  KLAASSEN KLAAS BEREND ,  NOMURA CALVIN SHIZUO ,  VAN PEPPEN JACOBUS LEONARDUS

    IPC: G11B5/39 ,  G11B5/00 ,  G11B5/02 ,  G11B5/40 ,  G11B19/04 ,  H03F3/72

    Abstract: The invention relates to a protection circuit for a magnetoresistive (MR) element (Rh) having a first terminal and a second terminal in which a first current source is coupled to the first terminal of the MR element to produce a bias current (J1) through the MR element and a second current source is coupled to the second terminal of the MR element to produce a reference current (Iref). According to the invention, circuit means (R,R,B) coupled across the MR element (Rh) senses the centre potential of the MR element substantially midway between the first and second terminals, and a feedback circuit (B) responsive to the sensed centre potential adjusts the current output of the first current source (J1) to maintain the centre potential to a selected reference voltage (Vcentre) to protect the MR element (Rh) from short circuits to a conductive area of the magnetisable recording medium being read by the MR element.

    37.
    发明专利
    未知

    公开(公告)号：DE10011056B4

    公开(公告)日：2005-03-24

    申请号：DE10011056

    申请日：2000-03-07

    Applicant: IBM

    Inventor： KLAASSEN KLAAS BEREND ,  PEPPEN JACOBUS CORNELIS LEONAR

    IPC: G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/39 ,  H03F1/42 ,  H03F3/45 ,  H03H11/28

    Abstract: The sense amplifier (302) includes a gain stage with an input which can be coupled to a connection having a characteristic impedance, the gain stage having a certain impedance. An active termination is connected to the input of the gain stage. The input impedance of the sense amplifier is formed from the combination of the impedance of the gain stage and that of the active termination. The input impedance of the sense amplifier corresponds to the characteristic impedance of the connection. The active termination may provide positive feedback from the gain stage to the input of the gain stage. Independent claims are included for a channel front end and for a magnetic storage system.

    Integrated head-electronics interconnection suspension for a data recording disk drive
    38.
    发明专利
    Integrated head-electronics interconnection suspension for a data recording disk drive 未知

    公开(公告)号：ZA963195B

    公开(公告)日：1996-12-09

    申请号：ZA963195

    申请日：1996-04-22

    Applicant: IBM

    Inventor： KLAASSEN KLAAS BEREND

    IPC: G11B5/48 ,  G11B5/60 ,  G11B21/02 ,  G11B21/21 ,  H05K1/02 ,  H05K1/03 ,  H05K1/05 ,  G12B ,  G11B

    Abstract: An integrated transducer-electronics interconnection suspension for a disk drive having a high data transfer rate generally above 15 Mbytes/sec between the transducer and the read/write electronics. A suspension supports a slider to which a transducer is mounted and maintains the slider in close proximity to the disk surface. An integrated transducer-electronics interconnection suspension is a laminate structure having electrically conductive traces as part of the structure and connecting the transducer with the read/write electronics. It can support high data transfer rates between the transducer and the read/write electronics by avoiding sudden changes in the characteristic impedance of the traces to minimize signal reflection on them. The width of the traces are shaped accordingly to prevent abrupt changes in the trace impedance caused by trace bonding areas, apertures and other mechanical obstructions in the suspension. Changes in the traces' direction are gradual to avoid signal reflection. Also, a patterned electrically conductive back plane may be provided in the laminate to better control the trace characteristic impedance. Where a trace crosses above a back plane opening, lateral extensions from the trace's side edges are formed to compensate for the resulting impedance change. In addition, the traces and bonding areas are grouped by signal type, with sufficient spacing between the groups, to minimize cross-coupling of the signals.

    40.
    发明专利
    未知

    公开(公告)号：DE69025726D1

    公开(公告)日：1996-04-11

    申请号：DE69025726

    申请日：1990-12-03

    Applicant: IBM

    Inventor： JOVE STEPHEN ALAN ,  KLAASSEN KLAAS BEREND ,  TRAN LONG

    IPC: G11B5/39 ,  G01R33/09 ,  G11B5/02 ,  G11B5/035 ,  G11B5/09

    Abstract: A circuit for producing a signal whose magnitude is a chosen amplitude compensation characteristic of the signals produced by a magnetoresistive (MR) element 10 comprising an input stage G1,G2 which produces an amplified output signal which is coupled to the output stage, and control signals I1,I2 proportional to the resistance of the MR element and inversely proportional to the resistance of the MR element which are coupled to a feedforward circuit 20. The feedforward circuit generates a chosen amplitude equalization characteristic of the signals coupled to the feedforward circuit, and this signal is coupled to a bias terminal of the output stage so that the output stage produces a signal representing the chosen amplitude compensation characteristic of the signals produced by the MR element.

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