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37 条记录 (耗时 0.015 秒)

    Amplifier circuit
    21.
    发明公开
    Amplifier circuit 失效
    Verstärker-Schaltungsanordnung。

    公开(公告)号：EP0588650A1

    公开(公告)日：1994-03-23

    申请号：EP93307339.7

    申请日：1993-09-16

    申请人： International Business Machines Corporation

    发明人： Contreras, John Thomas ,  Jove, Stephen Alan ,  Klaassen, Klaas Berend ,  van Peppen, Jacobus Cornelis Leonardus

    IPC分类号： G01R33/06 ,  H03F3/45 ,  G11B5/39

    CPC分类号： G11B33/122 ,  G01R33/09 ,  G11B5/00 ,  G11B5/02 ,  G11B2005/0016 ,  G11B2005/0018

    摘要： A data storage system comprises magnetoresistive (MR) sensing elements for sensing data from a recording medium that is referenced to ground, and an amplifier circuit including a biasing stage, an amplifying stage, and a matching stage, each referenced to a common supply voltage source and to ground. The biasing stage includes a reference current source for selectively biasing each MR element with a constant current and, in so doing, developing a single-ended voltage signal having a first dc component. The amplifying stage converts the single-ended voltage signal into an amplified single-ended output voltage signal having a second dc component but in which the first dc component is eliminated. The matching stage creates a bias and imposes said bias on the amplifying stage for converting the single-ended output voltage signal to a differential output voltage signal in which the second dc component is eliminated.

    摘要翻译： 数据存储系统包括用于感测来自参考地的记录介质的数据的磁阻（MR）感测元件，以及包括偏置级，放大级和匹配级的放大器电路，每个参考公共电源电压源 和地面。 偏置级包括用于以恒定电流选择性地偏置每个MR元件的参考电流源，并且在这样做时，开发具有第一直流分量的单端电压信号。 放大级将单端电压信号转换为具有第二直流分量的放大的单端输出电压信号，其中第一直流分量被消除。 匹配级产生偏置，并且在放大级上施加所述偏置，以将单端输出电压信号转换成消除第二直流分量的差分输出电压信号。

    Magnetic recording system
    24.
    发明公开
    Magnetic recording system 失效
    磁记录系统

    公开(公告)号：EP0455438A2

    公开(公告)日：1991-11-06

    申请号：EP91303831.1

    申请日：1991-04-26

    申请人： International Business Machines Corporation

    发明人： Klaassen, Klaas Berend ,  Van Peppen, Jacobus Cornelis Leonardus

    IPC分类号： G11B19/04 ,  G11B5/465 ,  G11B5/03

    CPC分类号： G11B5/022 ,  G11B5/09 ,  G11B5/465 ,  G11B5/5534 ,  G11B19/04

    摘要： The system includes a current- tapering circuit (100,105,112) which gradually reduces the WRITE (IW) current in a magnetic recording head (140) to zero over a time interval on the same order of magnitude as the characteristic relaxation time of the domain patterns in the magnetic recording head, rather than abruptly. Specific embodiments of the current-tapering circuit create a down-sloping ramp, a decaying exponential curve, and a high-frequency burst. The resultant magnetic recording system has reduced Barkhausen noise and reproducible READ performance as well as improved READ sensitivity following a WRITE operation.

    摘要翻译： 该系统包括电流收缩电路（100,105,112），其使磁记录头（140）中的写入（IW）电流逐渐减小到在时间间隔上零，其量值与磁畴图案的特征弛豫时间相同 磁记录头，而不是突然。 电流收缩电路的具体实施例产生下斜坡，衰减指数曲线和高频突发。 由此产生的磁记录系统减少了巴克豪森噪声和可重复的READ性能，并改善了WRITE操作后的读取灵敏度。

    A circuit for suppressing additive disturbances in data channels
    25.
    发明公开
    A circuit for suppressing additive disturbances in data channels 失效
    Schaltung zurUnterdrückungvon在Datenkanälen加入了Fehlern。

    公开(公告)号：EP0439299A2

    公开(公告)日：1991-07-31

    申请号：EP91300415.6

    申请日：1991-01-18

    申请人： International Business Machines Corporation

    发明人： Chung, Paul Wingshing ,  Jenkins, Michael Owen ,  Jove, Stephen Alan ,  Klaassen, Klaas Berend ,  Saber, Paik ,  Van Peppen, Jacobus Cornelius Leonardus

    IPC分类号： G11B20/24 ,  G11B20/00 ,  H03H21/00

    CPC分类号： G11B20/02 ,  G11B5/012 ,  G11B5/02 ,  G11B20/24 ,  G11B2005/0016

    摘要： A method and circuitry for suppressing additive transient disturbances in an analog differential input signal, such disturbances being due, for example, to thermal asperity transients caused by an MR transducer (10) contacting a moving storage surface (11). The input data signal is algebraically summed by a summing circuit (14) with a corrective feedback signal for providing as output signal. The output signal is fed back to a circuit (16) including an envelope detector (15) and differentiator (17) and converted into another signal that is the derivative of an amplitude envelope corresponding to the output signal. Nonlinear signal-adaptive filter means (18) converts the other signal into the corrective feedback signal, which substantially replicates the additive transient disturbance and is subtracted from the data input signal to render the output signal substantially free of the transient disturbance.
    The input, output and corrective signals are preferably differential signals.

    摘要翻译： 一种用于抑制模拟差分输入信号中的附加瞬态干扰的方法和电路，所述干扰是由例如由接触移动存储表面（11）的MR换能器（10）引起的热不均匀瞬变引起的。 输入数据信号由加法电路（14）用纠正反馈信号进行代数求和，以提供输出信号。 输出信号被反馈到包括包络检测器（15）和微分器（17）的电路（16），并被转换为作为与输出信号对应的幅度包络的导数的另一个信号。 非线性信号自适应滤波器装置（18）将另一信号转换成校正反馈信号，其基本上复制加法瞬态干扰，并从数据输​​入信号中减去，使得输出信号基本上没有瞬态干扰。 输入，输出和校正信号最好是差分信号。

    Protective circuit for magnetoresistive element
    26.
    发明公开
    Protective circuit for magnetoresistive element 失效
    Schutzschaltungfürein磁阻元素。

    公开(公告)号：EP0361781A2

    公开(公告)日：1990-04-04

    申请号：EP89309589.3

    申请日：1989-09-20

    申请人： International Business Machines Corporation

    发明人： Jove, Stephen Alan ,  Klaassen, Klaas Berend ,  Nomura, Calvin Shizuo ,  van Peppen, Jacobus Leonardus

    IPC分类号： G11B5/02 ,  G11B5/40 ,  G11B19/04 ,  H03F3/72

    CPC分类号： H03F3/72 ,  G11B5/02 ,  G11B5/40 ,  G11B19/04 ,  G11B2005/0018

    摘要： 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.

    摘要翻译： 本发明涉及一种用于具有第一端子和第二端子的磁阻（MR）元件（Rh）的保护电路，其中第一电流源耦合到MR元件的第一端子以产生偏置电流（J1）至 MR元件和第二电流源耦合到MR元件的第二端子以产生参考电流（Iref）。 根据本发明，跨越MR元件（Rh）耦合的电路装置（R，R，B）基本上在第一和第二端子之间的中途感测到MR元件的中心电位，以及响应于所感测的反馈电路（B） 中心电位调节第一电流源（J1）的电流输出，以将中心电位维持在选定的参考电压（Vcentre），以保护MR单元（Rh）免于短路到可磁化记录介质的导电区域，由 MR元素。

    A circuit for biasing a magnetoresistive sensor and amplifying signals produced thereby
    28.
    发明公开
    A circuit for biasing a magnetoresistive sensor and amplifying signals produced thereby 失效
    电路，用于偏置磁阻传感器和放大由此产生的信号。

    公开(公告)号：EP0241770A1

    公开(公告)日：1987-10-21

    申请号：EP87104313.9

    申请日：1987-03-24

    申请人： International Business Machines Corporation

    发明人： Klaassen, Klaas Berend ,  Jove, Stephen Alan

    IPC分类号： G01R33/06 ,  G11B5/39

    CPC分类号： G11B5/02 ,  G01R33/09 ,  G11B19/02 ,  G11B2005/0016

    摘要： A constant current source (J1) supplies a bias current to a magnetoresistive (MR) sensor (R h ) and amplifier means (11, 12, 13) is responsive to the current flowing through the MR sensor to produce an amplified output signal representing the change in resistance of the MR sensor arising from changes in the magnetic field to which the MR sensor is exposed. The circuit includes first means (14) coupled to the amplifier means to set the frequency response thereof and second means (15) for substantially eliminating DC offset voltage in the output signal.
    The resistance of the MR sensor can be disposed as degenerative feedback in the emitter circuit of a differential pair comprising the input stage of the amplifier. The constant current source (J1) that supplies bias current to the MR sensor also 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 in transistor characteristics and the steady-state value of the MR sensor.

    摘要翻译： 恒流源（J1）提供偏置电流提供给磁阻（MR）传感器（RH）和放大器装置（11，12，13）响应于流经MR传感器的电流，以产生放大的输出信号表示该变化 在MR传感器在从磁场的变化所产生的阻力，以哪个MR传感器被暴露。 该电路包括第一装置耦合到所述放大器（14）的手段来设置其频率响应和用于基本上消除DC的第二装置（15）偏移的输出信号电压。 MR传感器的电阻可被设置为在差分对包括放大器的输入级的发射极电路负反馈。 恒定电流源（J1）做建筑材料偏置电流提供给MR传感器从而将电流提供给差分对。 DC反馈到所述输入级的余额在差分输入级的两个路径的电流流动，以校正DC偏移在从变化的晶体管特性的输出和MR传感器的稳态值所产生。