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    CIRCUIT AND METHOD FOR WRITING INTO MEMORY DISK
    1.
    发明专利
    CIRCUIT AND METHOD FOR WRITING INTO MEMORY DISK 失效

    公开(公告)号：JP2001101608A

    公开(公告)日：2001-04-13

    申请号：JP2000274654

    申请日：2000-09-11

    Applicant: ST MICROELECTRONICS INC

    Inventor： PATTI GUISEPPE ,  ALINI ROBERTO ,  DENOYER GILLES P

    IPC: G11B5/09 ,  G11B5/012 ,  G11B5/02

    Abstract: PROBLEM TO BE SOLVED: To provide an improved driver circuit for a writing head of a disk storage device. SOLUTION: In this circuit, the current is supplied to one terminal of the writing head in the manner of activating a pull-up device of one driver sub- circuit by a control circuit, meanwhile, the current is absorbed from another terminal of the writing head by activating a 1st current sync circuit of another driver sub-circuit.

    DRIVER CIRCUIT OF WRITE HEAD FOR WRITING TO MEMORY DISK AND ITS METHOD
    2.
    发明专利
    DRIVER CIRCUIT OF WRITE HEAD FOR WRITING TO MEMORY DISK AND ITS METHOD 审中-公开

    公开(公告)号：JP2002123902A

    公开(公告)日：2002-04-26

    申请号：JP2001260774

    申请日：2001-08-30

    Applicant: ST MICROELECTRONICS INC

    Inventor： PATTI GUISEPPE ,  ALINI ROBERTO

    IPC: G11B5/09 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02

    Abstract: PROBLEM TO BE SOLVED: To provide an improved method and the circuit for controlling a write head for a magnetic disk storage device. SOLUTION: When the flow direction of the current is reversed from the 1st direction in which the current is being supplied to the write head through a write head terminal to the 2nd direction in which the current is drawn out from the write head through the write head terminal, an appropriate pull-up device is activated during the period of specified time. A clamp device being connected to the pull-up device to be temporarily activated is activated after that, thereby the corresponding write head terminal is clamped to the intermediate voltage level at the steady state.

    CIRCUIT AND METHOD FOR WRITING INTO MEMORY DISK BY BOOSTED VOLTAGE
    3.
    发明专利
    CIRCUIT AND METHOD FOR WRITING INTO MEMORY DISK BY BOOSTED VOLTAGE 失效

    公开(公告)号：JP2001101609A

    公开(公告)日：2001-04-13

    申请号：JP2000275203

    申请日：2000-09-11

    Applicant: ST MICROELECTRONICS INC

    Inventor： PATTI GUISEPPE ,  ALINI ROBERTO ,  PAKRISWAMY ELANGO

    IPC: G11B5/09 ,  G11B5/012 ,  G11B5/02

    Abstract: PROBLEM TO BE SOLVED: To provide an improved circuit and the method for driving a writing head of a disk storage device. SOLUTION: When the current flowing direction through the writing head is inverted from the 1st direction supplying the current to the writing head through a writing head terminal to the 2nd direction drawing out the current from the writing head through the writing head terminal, a bootstrap circuit and a current sync circuit are activated to enable the current to be quickly drawn out from the writing head.

    DEVICE AND METHOD FOR REDUCING THERMAL INTERFERENCE OF MR HEAD OF DISK DRIVE
    4.
    发明专利
    DEVICE AND METHOD FOR REDUCING THERMAL INTERFERENCE OF MR HEAD OF DISK DRIVE 失效

    公开(公告)号：JP2000163705A

    公开(公告)日：2000-06-16

    申请号：JP32907799

    申请日：1999-11-19

    Applicant: ST MICROELECTRONICS INC

    Inventor： PATTI GUISEPPE ,  LEE EUGENE C ,  ALINI ROBERTO

    IPC: G11B5/09 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B20/10 ,  G11B20/24 ,  G11B27/36

    Abstract: PROBLEM TO BE SOLVED: To remove the ringing and unnecessary offset of a read signal by making resistance values equal to a 1st and a 2nd specific resistance value in response to a 1st and a 2nd control input and generating the 2nd control input in response to the detection of a thermal event. SOLUTION: An effective resistance value is given by a resistance R1 and the programmed resistance value of a resistance R1 and a variable resistance value circuit 132 and the cutoff frequency of a filter 112 varies as the resistance value of the variable resistance value circuit 132 varies. In a normal operation period of a read channel, the resistance value of the variable resistance value circuit 132 is relatively high impedance and the effective resistance value of the filter 112 becomes substantially equal to the resistance value of the resistance R1. When thermal variation is detected, the effective resistance value of the filter 112 decreases to increase the cutoff frequency. This effective resistance value decreases by programming the variable resistance value circuit 132 to a specific resistance value in response to the input signal from a control circuit 110.

    TWO MODE BIAS OF MAGNETIC RESISTANCE HEAD
    5.
    发明专利
    TWO MODE BIAS OF MAGNETIC RESISTANCE HEAD 失效

    公开(公告)号：JP2000149206A

    公开(公告)日：2000-05-30

    申请号：JP31331899

    申请日：1999-11-04

    Applicant: ST MICROELECTRONICS INC

    Inventor： PATTI GUISEPPE ,  AXEL ALLEGRET DE LA SJORLES

    IPC: G11B5/39 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/03 ,  G11B5/09 ,  G11B5/40 ,  G11B5/455 ,  G11B19/02

    Abstract: PROBLEM TO BE SOLVED: To make selectable a magnetioresistance head between two mode biases for biasing by enabling either of bias voltage and bias current to be supplied to the MR head by a simple pre-amplifier. SOLUTION: When a voltage bias is selected, an input signal 301 to a mode selector 302 is supplied as an output on a voltage bias line VBias, a signal indicating a desired value of bias to be used on a reading head 206 is supplied as an input to voltage DAC 308. Therefore, the level of the VBias supplied onto an output end is directly decided by a bias value input signal 301, also fed back through a loop 320, and precise desired voltage is obtained crossing the head 206. When current bias is selected, a bias input signal 301 is supplied as an output IBias on a current bias line. A reference current is used as a current source for current DAC 310, and a selected value is supplied as an output about IBias.

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