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    • 1. 发明申请
    • DEGAUSS CONTROL FOR MAGNETIC DISK-DRIVE PREAMPLIFIER
    • 磁力驱动前置放大器的等级控制
    • US20090284860A1
    • 2009-11-19
    • US12120525
    • 2008-05-14
    • TORU TAKEUCHI
    • TORU TAKEUCHI
    • G11B15/18
    • G11B5/465G11B2005/0018
    • One embodiment of the invention includes a preamplifier system for a magnetic disk-drive. The system includes a current distributor configured to generate a reference current and to decay the reference current from a first magnitude to a second magnitude during a degauss period to degauss a magnetic disk write head. The degauss period defines a transition from a write cycle to a read cycle of the magnetic disk-drive and has a predetermined time duration that is independent of the first magnitude of the reference current during the write cycle. An output driver is configured to provide a write current to the magnetic disk write head having a magnitude with an absolute value that is based on the reference current.
    • 本发明的一个实施例包括用于磁盘驱动器的前置放大器系统。 该系统包括配置成产生参考电流并且在消磁周期期间将参考电流从第一幅度衰减到第二幅值以消除磁盘写入头的电流分配器。 消磁周期定义从磁盘驱动器的写入周期到读取周期的转变,并且具有与写入周期期间的参考电流的第一幅度无关的预定持续时间。 输出驱动器被配置为向具有基于参考电流的绝对值的幅度的磁盘写入头提供写入电流。