利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

37 条记录 (耗时 0.014 秒)

    Low noise amplifier with short circuit protection for signals from magnetoresistive element
    3.
    发明公开
    Low noise amplifier with short circuit protection for signals from magnetoresistive element 失效
    RauscharmerVerstärkermit KurzschlussschutzfürSignale von einem magnetoresistiven Element。

    公开(公告)号：EP0455472A1

    公开(公告)日：1991-11-06

    申请号：EP91303921.0

    申请日：1991-05-01

    申请人： International Business Machines Corporation

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

    IPC分类号： G01R33/06

    CPC分类号： G11B5/40 ,  G01R33/09 ,  G11B2005/0016

    摘要： An amplifier circuit produces an electrical output signal whose magnitude is representative of a signal produced by a magnetoresistive (MR) element (Rmr) and also protects the MR element (Rmr) from electrical short circuits between the element (Rmr) and on adjacent conductive surface. A first feedback loop biases the MR element (Rmr) with a bias current and amplifies a signal current for causing the MR element (Rmr) to produce a circuit output signal corresponding to dRh/Rh and in which any dc offset error is minimized R h is the resistance of the MR element and dRh is the magnetic-signal-induced change in the resistance of the MR element. A second feedback loop insures that the MR element (Rmr) is held at a preselected reference potential and that no current will flow sufficiently to damage the element in the event of a short circuit between the element and the surface. The feedback loops are interconnected by outputs of the respective feedback loops being commonly connected to the bases of a pair of input bipolar transistors (Q1,Q2), whose respective emitters are connected to opposite terminals of the MR element (Rmr).

    摘要翻译： 放大器电路产生电气输出信号，其大小代表由磁阻（MR）元件（Rmr）产生的信号，并且还保护MR元件（Rmr）与元件（Rmr）之间的电气短路和相邻的导电表面 。 第一反馈环路用偏置电流偏置MR元件（Rmr），并放大信号电流，使MR元件（Rmr）产生对应于dRh / Rh的电路输出信号，并且其中任何直流偏移误差最小化 是MR元件的电阻，dRh是MR元件的电阻的磁信号引起的变化。 第二反馈环路确保MR元件（Rmr）保持在预选的参考电位，并且在元件和表面之间的短路的情况下，没有电流将充分流动以损坏元件。 反馈回路通过各自的反馈回路的输出相互连接，所述反馈环通常连接到一对输入双极晶体管（Q1，Q2）的基极，其各自的发射极连接到MR元件（Rmr）的相对端子。

    Frequency response compensation circuit
    4.
    发明公开
    Frequency response compensation circuit 失效
    频率响应补偿电路

    公开(公告)号：EP0265763A3

    公开(公告)日：1989-01-25

    申请号：EP87114909.2

    申请日：1987-10-13

    申请人： International Business Machines Corporation

    发明人： Jove, Stephen Alan ,  Klaassen, Klaas Berend ,  VanPeppen, Jacobus Cornelis Leonardus ,  Vo, Chon Ngoc

    IPC分类号： H03F1/08 ,  H03F1/48

    CPC分类号： H03F1/48 ,  G11B5/02 ,  G11B5/035 ,  H03F1/083

    摘要： A frequency response compensation circuit includes a first forward gain stage (J1, T1, T1ʹ, R1, R1ʹ, R3, R3ʹ) and a second reverse gain stage (J2, T2, T2ʹ, RE, REʹ, R2, R2ʹ) coupled to the first stage in negative feedback mode. The reverse gain stage depresses the gain of the first stage at low frequencies. When the frequency response of the reverse gain stage begins degrading, which corresponds to the frequency of the real zero of the compensation circuit, the gain of the compensation circuit begins increasing and increases until the gain of the reverse stage is zero. The circuit consists of only transistors and resistors and so can be formed as an integrated circuit. By proper selection of the resistors in the circuit, the zero of the compensation circuit can be chosen to correspond to the frequency of the pole of the uncompensated input, so as to increase the bandwidth. Multiple reverse gain stages can be included, with a selected reverse gain stage switched into connection with the first stage, so as to provide a constant frequency response for different frequency response inputs.

    Amplifier for magnetoresistive sensor
    8.
    发明公开
    Amplifier for magnetoresistive sensor 失效
    Verstärkerfüreinen磁阻传感器。

    公开(公告)号：EP0586062A1

    公开(公告)日：1994-03-09

    申请号：EP93305533.7

    申请日：1993-07-14

    申请人： International Business Machines Corporation

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

    IPC分类号： G11B5/02 ,  G11B20/24 ,  G01R33/06

    CPC分类号： H03F3/195 ,  G11B5/012 ,  G11B5/02 ,  G11B5/11 ,  G11B5/40 ,  G11B5/553 ,  G11B19/02 ,  G11B19/04 ,  G11B23/505 ,  G11B33/1493 ,  G11B2005/0016 ,  G11B2005/0018 ,  H03F2200/372

    摘要： 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.

    摘要翻译： 具有单端输入的低噪声，低功率，低电压放大器电路没有共模抑制，以同时偏置和放大由磁盘文件中的磁阻（MR）元件产生的信号。 放大器电路包括单个（接地）电源电压源。 每个MR元件的一个端子和每个MR元件的导电衬底和盘文件中每个盘的导电衬底被接地以最小化瞬态导电粗糙度电流。 磁盘文件的磁头/磁盘组件被一个高度导电的静电屏蔽金属外壳完全封闭，它作为法拉第笼子进行操作，并将连接MR元件的引线与放大器电路连接起来，从而大大快速的上升/下降时间电压瞬变。

    Frequency response compensation circuit
    10.
    发明公开
    Frequency response compensation circuit 失效
    Frequenzgangkompensationsschaltung。

    公开(公告)号：EP0265763A2

    公开(公告)日：1988-05-04

    申请号：EP87114909.2

    申请日：1987-10-13

    申请人： International Business Machines Corporation

    发明人： Jove, Stephen Alan ,  Klaassen, Klaas Berend ,  VanPeppen, Jacobus Cornelis Leonardus ,  Vo, Chon Ngoc

    IPC分类号： H03F1/08 ,  H03F1/48

    CPC分类号： H03F1/48 ,  G11B5/02 ,  G11B5/035 ,  H03F1/083

    摘要： A frequency response compensation circuit includes a first forward gain stage (J1, T1, T1ʹ, R1, R1ʹ, R3, R3ʹ) and a second reverse gain stage (J2, T2, T2ʹ, RE, REʹ, R2, R2ʹ) coupled to the first stage in negative feedback mode. The reverse gain stage depresses the gain of the first stage at low frequencies. When the frequency response of the reverse gain stage begins degrading, which corresponds to the frequency of the real zero of the compensation circuit, the gain of the compensation circuit begins increasing and increases until the gain of the reverse stage is zero. The circuit consists of only transistors and resistors and so can be formed as an integrated circuit. By proper selection of the resistors in the circuit, the zero of the compensation circuit can be chosen to correspond to the frequency of the pole of the uncompensated input, so as to increase the bandwidth. Multiple reverse gain stages can be included, with a selected reverse gain stage switched into connection with the first stage, so as to provide a constant frequency response for different frequency response inputs.

    摘要翻译： 频率响应补偿电路包括第一正向增益级（J1，T1，T1'，R1，R1'，R3，R3'）和第二反向增益级（J2，T2，T2'，RE，RE'，R2， R2'）以负反馈模式耦合到第一级。 反向增益级在低频下压抑第一级的增益。 当反向增益级的频率响应开始降级时，其对应于补偿电路的实际零点的频率，补偿电路的增益开始增加并增加，直到反向增益为零。 该电路仅由晶体管和电阻组成，因此可以形成为集成电路。 通过适当选择电路中的电阻，补偿电路的零点可以选择为与未补偿输入的极点的频率相对应，从而增加带宽。 可以包括多个反向增益级，其中选择的反向增益级与第一级切换成连接，以便为不同的频率响应输入提供恒定的频率响应。