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公开(公告)号：CA2217733A1
公开(公告)日：1996-12-27
申请号：CA2217733
申请日：1996-02-09
Applicant: IBM
Inventor： KLAASSEN KLAAS BEREND
Abstract: An integrated transducer-electronics interconnection suspension (12) for a disk drive having a high data transfer rate generally above (15) Mbytes/sec between the transducer (9) and the read/write electronics. A suspension (12) supports a slider (10) to which a transducer (9) is mounted and maintains the slider (10) in close proximity to the disk surface. An integrated transducerelectronics interconnection suspension is a laminate structure having electrically conductive traces as part of the structure and connecting the transducer (9) with the read/write electronics. It can support high data transfer rates between the transducer (9) and the read/write electronics by providing means for 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.
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公开(公告)号：DE69025726T2
公开(公告)日：1996-09-26
申请号：DE69025726
申请日：1990-12-03
Applicant: IBM
Inventor： JOVE STEPHEN ALAN , KLAASSEN KLAAS BEREND , TRAN LONG
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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公开(公告)号：SG150794G
公开(公告)日：1995-03-17
申请号：SG150794
申请日：1994-10-17
Applicant: IBM
Inventor： JOVE STEPHEN ALAN , KLAASSEN KLAAS BEREND , NOMURA CALVIN SHIZUO , PEPPEN VAN JACOBUS LEONARDUS
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.
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公开(公告)号：DE3780677T2
公开(公告)日：1993-03-11
申请号：DE3780677
申请日：1987-03-24
Applicant: IBM
Inventor： KLAASSEN KLAAS BEREND , JOVE STEPHEN ALAN
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公开(公告)号：DE3780677D1
公开(公告)日：1992-09-03
申请号：DE3780677
申请日：1987-03-24
Applicant: IBM
Inventor： KLAASSEN KLAAS BEREND , JOVE STEPHEN ALAN
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Patent Agency Ranking
公开(公告)号：SG87807A1
公开(公告)日：2002-04-16
申请号：SG1999002459
申请日：1999-05-17
Applicant: IBM
Inventor： PEPPEN VAN JACOBUS , CONTRERAS JOHN THOMAS , KLAASSEN KLAAS BEREND
Abstract: A magnetic-head write-driver circuit includes a write-driver circuit and a by-pass driver circuit coupled in parallel to a signal path between the input and the output of the magnetic-head write-driver circuit. The write-driver circuit receives an input signal having transitions and outputs a first write signal related to the input signal. The by-pass driver circuit outputs an assist signal that is coupled to the first write signal to form an output write signal. The assist signal is related to transitions of the first write signal and assists in shortening reversal time of the transitions of a write signal by producing "overshoots" in the write signal at the time of the transitions. Additionally, the assist signal assists in charging and discharging a parasitic capacitance associated with an output of the magnetic-head write-driver circuit. The assist signal can add a current to, and/or enforce a voltage on, the first write signal to form the output write signal.
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公开(公告)号：DE69317084T2
公开(公告)日：1998-09-17
申请号：DE69317084
申请日：1993-07-14
Applicant: IBM
IPC: G11B5/00 , G11B5/012 , G11B5/02 , G11B5/11 , G11B5/39 , G11B5/40 , G11B5/55 , G11B19/02 , G11B19/04 , G11B23/50 , G11B33/00 , G11B33/14 , H03F3/04 , H03F3/195 , G11B20/24 , G01R33/06
Abstract: Low noise, low power, low voltage amplifier circuits with a single ended input having no common mode rejection for concurrently biasing and amplifying signals generated by magnetoresistive (MR) elements in a disk file. The amplifier circuits comprise a single (grounded) supply voltage source. One terminal of each MR element and the conductive substrate of each MR element and the conductive substrate of each disk in the disk file are grounded to minimize transient conductive asperity currents. The head/disk assembly of the disk file is completely enclosed by a highly conductive electrostatically shielded metallic enclosure that.. operates as a Faraday cage and isolates leads connecting the MR elements with the amplifier circuit from large, fast rise/fall time voltage transients.
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公开(公告)号：DE69317185D1
公开(公告)日：1998-04-09
申请号：DE69317185
申请日：1993-09-16
Applicant: IBM
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公开(公告)号：DE68914075T2
公开(公告)日：1994-10-20
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
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.
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