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    • 1. 发明授权
    • Electrically positionable short-circuits
    • 电位置短路
    • US4843358A
    • 1989-06-27
    • US211102
    • 1988-06-20
    • William H. MeiseArye RosenPaul J. Stabile
    • William H. MeiseArye RosenPaul J. Stabile
    • H01L29/423H01L29/78H01L29/868H01L45/02H01P1/185H01P1/20H01P1/28H01P7/00
    • H01L45/02H01L29/42368H01L29/78H01L29/868H01P1/185H01P1/20H01P1/28H01P7/00
    • An electrical short-circuit for alternating-current (ac) microwave signals is physically positionable in direct response to an electrical bias control without an intermediary electromechanical converter. The electrically positionable short circuit includes at least first and second doped regions in a semiconductor, separated by a region in which the short circuit is formed between the doped regions by the bias. A first embodiment comprises discrete diodes connected between conductors at different locations, the discrete diodes having different forward junction voltages, so that varying the common bias voltage varies the number of conducting diodes and thus positions the short circuit in a stepwise manner. A FET embodiment includes various discrete MOSFETs having different conduction threshold voltages, and having their sources and drains connected at various points to the conductors to be short-circuited, so that variations of a common gate bias voltage selectively render one or more of the FETs conductive, thereby stepwise positioning the short-circuit. Distributed PIN and MOSFET structures provide continuous short circuit positioning as a monotonic function of bias. Two distinct modes of operation, pinchoff/resistive and a resistive/below-threshold are possible for the distributed FET embodiment. The electrically positionable short-circuit can be coupled to the conductors of a transmission line for effecting tuning, or can be coupled to a transmission line in such a way as to vary the signal path length and thereby provide phase shift.
    • 交流(ac)微波信号的电气短路可以直接响应于电偏压控制而物理定位,而无需中间机电转换器。 电可定位短路包括在半导体中的至少第一和第二掺杂区域,由通过偏压在掺杂区域之间形成短路的区域分开。 第一实施例包括连接在不同位置的导体之间的分立二极管,分立二极管具有不同的正向结电压,使得改变公共偏置电压改变导通二极管的数量,从而以逐步的方式定位短路。 FET实施例包括具有不同导通阈值电压的各种分立MOSFET,并且其源极和漏极在不同点处连接到要短路的导体,使得公共栅极偏置电压的变化选择性地使一个或多个FET导通 ,从而逐步定位短路。 分布式PIN和MOSFET结构提供连续的短路定位作为偏置的单调函数。 对于分布式FET实施例,两种不同的操作模式,引脚/电阻和电阻/低于阈值是可能的。 可电气定位的短路可以耦合到传输线的导体,用于实现调谐,或者可以以这样的方式耦合到传输线,以便改变信号路径长度,从而提供相移。