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    Monolithic high-frequency-signal switch and power limiter device
    1.
    发明授权
    Monolithic high-frequency-signal switch and power limiter device 失效
    单片高频信号开关和功率限幅器

    公开(公告)号：US5049971A

    公开(公告)日：1991-09-17

    申请号：US614579

    申请日：1990-11-15

    申请人： Charles F. Krumm

    发明人： Charles F. Krumm

    IPC分类号： H01L29/06 ,  H03K17/00 ,  H03K17/56 ,  H03K17/84

    CPC分类号： H01L29/0661 ,  H03K17/56 ,  H03K17/84 ,  H03K2217/0036

    摘要： A device useful both as a switch and power limiter and particularly adapted for use in microwave application. The device is made with conventional FET processing technology, a current conducting layer being formed at a surface of a substrate, the device then being electrically isolated by using any one of a number of conventional processes. Ohmic contacts are deposited to make electrical contact at the conducting layer. A groove is then cut with a focused ion beam across the conducting layer and between the ohmic contacts. The length of the groove controls the threshold voltage for the device and the depth controls the saturation current. Very low values of saturation current can be obtained by controlling the groove dimensions thus significantly reducing the DC power drain when the device is operated just above saturation. A very high differential resistance ratio is obtained by adjusting the threshold voltage of the device.

    摘要翻译： 用作开关和功率限制器并且特别适用于微波应用的装置。 该装置由常规的FET处理技术制成，在衬底的表面上形成电流导电层，然后通过使用多种常规工艺中的任何一种将该器件电隔离。 沉积欧姆接触以在导电层处电接触。 然后用聚焦离子束在导电层和欧姆接触之间切割凹槽。 凹槽的长度控制器件的阈值电压，深度控制饱和电流。 通过控制沟槽尺寸可以获得非常低的饱和电流值，从而在器件刚刚高于饱和时显着降低直流功率消耗。 通过调节器件的阈值电压可获得非常高的差分电阻比。

    Acoustic surface wave bubble switch
    2.
    发明授权
    Acoustic surface wave bubble switch 失效
    声学表面波浪开关

    公开(公告)号：US4103339A

    公开(公告)日：1978-07-25

    申请号：US679268

    申请日：1976-04-22

    申请人： Wayne C. Hubbell ,  Christopher T. Chang

    发明人： Wayne C. Hubbell ,  Christopher T. Chang

    IPC分类号： G11C8/00 ,  G11C19/08 ,  H03K17/84 ,  H03K19/168

    CPC分类号： H03K19/168 ,  G11C19/0808 ,  G11C19/0816 ,  G11C19/0883 ,  G11C8/005 ,  H03K17/84

    摘要： An acoustic surface wave bubble switch in which a magnetic bubble domain traveling in a thin film magnetic platelet can be guided in alternate directions by application of an acoustic wave. An array of longitudinal magnetic elements in the form of single bars and bars combined to form a T configuration together with a rotating in-plane magnetic field causes the magnetic bubble to propagate across the magnetic platelet. One of the configurations of the magnetic element is a T with a second horizontal bar and the bubble will have equal attraction for either of the horizontal bars. At the proper time an acoustic wave can direct the bubble to propagate in the direction of a chosen horizontal bar thereby effecting a switching action.

    Method for driving magnetic head and driving circuit of magneto-optical disk drive
    10.
    发明申请
    Method for driving magnetic head and driving circuit of magneto-optical disk drive 失效
    磁光盘驱动磁头驱动电路的方法

    公开(公告)号：US20030007427A1

    公开(公告)日：2003-01-09

    申请号：US10185851

    申请日：2002-06-27

    申请人： FUJITSU LIMITED

    发明人： Michio Matsuura

    IPC分类号： G11B011/00

    CPC分类号： G11B11/1051 ,  G11B11/10508 ,  H03K17/12 ,  H03K17/64 ,  H03K17/84 ,  H03K2217/0036

    摘要： A driving circuit for a magnetic head that is used for modulating magnetic field in a magneto-optical disk drive is provided, which reduces power consumption even if the magnetic head has large inductance. The driving circuit comprises a switching circuit for generating pulse-like drive current in synchronization with a timing for applying a pulse of light in accordance with a space between pits to be recorded on a magneto-optical disk, and a conversion circuit for converting the pulse-like drive current into sine-wave current to be supplied to the magnetic head such that the maximum magnetic field can be obtained at the timing for applying a pulse of light.

    摘要翻译： 提供了用于调制磁光盘驱动器中的磁场的用于磁头的驱动电路，即使磁头具有较大的电感也能降低功耗。 该驱动电路包括与根据要记录在磁光盘上的凹坑之间的空间施加光脉冲的定时同步地产生脉冲状驱动电流的开关电路和用于转换脉冲的转换电路 类似的驱动电流进入正弦波电流以提供给磁头，使得可以在施加光脉冲的定时获得最大磁场。