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4 条记录 (耗时 0.012 秒)

    Laser power-drive circuit having a scaling DAC supplying a scaled reference signal to a plurality of scaled DAC's that supply a plurality of scaled output signals
    1.
    发明授权
    Laser power-drive circuit having a scaling DAC supplying a scaled reference signal to a plurality of scaled DAC's that supply a plurality of scaled output signals 失效
    具有缩放DAC的激光功率驱动电路为缩放的DAC提供缩放的参考信号，所述缩放的DAC提供多个缩放的输出信号

    公开(公告)号：US5640381A

    公开(公告)日：1997-06-17

    申请号：US612993

    申请日：1996-03-08

    申请人： David Ernest Call ,  Stephen J. Hrinya ,  Jerry Elden Hurst, Jr. ,  Glen Alan Jaquette ,  Anthony Juliana, Jr.

    发明人： David Ernest Call ,  Stephen J. Hrinya ,  Jerry Elden Hurst, Jr. ,  Glen Alan Jaquette ,  Anthony Juliana, Jr.

    IPC分类号： G11B7/0045 ,  G11B7/125 ,  G11B20/18 ,  H01S5/0683 ,  G11B7/00

    CPC分类号： G11B7/126 ,  H01S5/0683 ,  G11B20/182 ,  G11B7/0045

    摘要： An optical disk recorder employs laser drive signals having diverse current or power levels. A scaling digital-analog-converter (DAC) supplies a scaled reference signal to a plurality of scaled DACs. The scaled DACs supply the diverse laser drive signals. Calibrating the scaling DAC calibrates the scaled DACs. A base array of DACs include not only the scaling DAC but a plurality of base array DACs. Such base array DACs control reading operations as well as supplying a threshold current. The threshold current is that laser drive signal current level below which laser 25 does not emit a laser beam. During writing, the CUT current is added to the laser drive currents supplied by the scaled DACs. A desired CUT current is determined by calculating a slope of the laser drive current to emission of radiation. Then the slope is extrapolated to a zero emission point below which no coherent emission of radiation occurs.

    摘要翻译： 光盘记录器采用具有不同电流或功率电平的激光驱动信号。 缩放数字模拟转换器（DAC）将缩放的参考信号提供给多个缩放的DAC。 缩放的DAC提供多种激光驱动信号。 校准缩放DAC校准缩放的DAC。 DAC的基本阵列不仅包括缩放DAC，而且包括多个基本阵列DAC。 这种基本阵列DAC控制读取操作以及提供阈值电流。 阈值电流是激光器驱动信号电流水平低于激光器25不发射激光束。 在写入期间，CUT电流被添加到由缩放DAC提供的激光驱动电流。 通过计算激光驱动电流对发射辐射的斜率来确定期望的CUT电流。 然后将斜率外推到零点以下，不超过辐射发生相干发射。

    Thermal fly height induced shield instability screening for magnetoresistive heads
    3.
    发明授权
    Thermal fly height induced shield instability screening for magnetoresistive heads 失效
    热飞溅高度引起的屏蔽不稳定性屏蔽磁阻头

    公开(公告)号：US07564236B1

    公开(公告)日：2009-07-21

    申请号：US12166163

    申请日：2008-07-01

    申请人： David Ernest Call ,  Hardayal Singh Gill

    发明人： David Ernest Call ,  Hardayal Singh Gill

    IPC分类号： G01R33/09 ,  G11B5/33 ,  G11B5/39

    CPC分类号： G11B5/455 ,  B82Y25/00 ,  G01R33/091 ,  G01R33/093

    摘要： A method for testing magnetic heads formed on a wafer to detect the presence of thermal induced popcorn noise resulting from thermal fly height control. The method includes performing a quasi test on a magnetic head, the quasi test being performed over 400 or more cycles of magnetic field application. For additional test accuracy, the write head can be cycled while 400 or more cycles of magnetic field are generated.

    摘要翻译： 一种用于测试形成在晶片上的磁头以检测由热飞扬高度控制引起的热诱导爆米花噪声的存在的方法。 该方法包括在磁头上执行准测试，在400或以上的磁场施加周期进行准测试。 为了额外的测试精度，写入头可以循环，同时产生400或更多的磁场周期。