Method and apparatus for generating low-noise current for MR heads
    1.
    发明授权
    Method and apparatus for generating low-noise current for MR heads 有权
    用于产生MR磁头的低噪声电流的方法和装置

    公开(公告)号:US06417723B1

    公开(公告)日:2002-07-09

    申请号:US09316685

    申请日:1999-05-21

    Abstract: A method and apparatus for generating low-noise current for a disc-drive head, and in one embodiment, for a magneto-resistive head. In one embodiment, an automatic-adjustment circuit selectively disables selected pairs of current-mirror transistors to achieve a desired minimum effective width-to-length ratio of a field-effect transistor current mirror, in order to reduce device noise. In one embodiment, the current mirror provides a constant current to a magneto-resistive head in a magnetic disc drive.

    Abstract translation: 一种用于产生用于盘驱动头的低噪声电流的方法和装置,并且在一个实施例中用于磁阻头。 在一个实施例中,为了减少器件噪声,自动调节电路选择性地禁用所选择的电流镜晶体管对,以实现场效应晶体管电流镜的期望的最小有效宽度 - 长度比。 在一个实施例中,电流镜向磁盘驱动器中的磁阻头提供恒定电流。

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