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Detector log video amplifier

机译:检测器对数视频放大器

摘要

A Detector Log Video Amplifier (DLVA) comprising a first RF detector for detecting the power levels of received RF signals having power levels within a first range (e.g., -40 dBm to -20 dBm) and producing corresponding first video frequency signals having amplitudes representative thereof, from which are produced output signals having amplitudes logarithmically proportional to such received signals. A second RF detector detects the power levels of received RF signals having power levels within a second range (e.g., -20 dBm to +20 dBm) and produces corresponding second video frequency signals having amplitudes representative thereof, from which are produced output signals having amplitudes logarithmically proportional to such received signals. A control signal is produced from the second video frequency signals, the control signal having a level in accordance with the power levels of received RF signals. Received RF signals having power levels equal to or exceeding a first level (e.g., 0 dBm) are attenuated in accordance with the control signal level and coupled to the first detector. A limiter is responsive to the power levels of received RF signals exceeding a second level (e.g., +5 dBm) for limiting the power levels of such RF signals coupled to the attenuator in accordance with the power levels of such signals exceeding the second level. With such arrangement, the RF signals coupled to the first detector are prevented from exceeding the first level, thereby significantly reducing the DLVA's recovery time, for example to less than 500 nanoseconds.
机译:检测器对数视频放大器(DLVA),包括第一RF检测器,用于检测具有在第一范围(例如-40 dBm至-20 dBm)内的功率水平的接收到的RF信号的功率水平,并产生幅度为代表的相应的第一视频信号从中产生输出信号,该输出信号具有与这种接收信号成对数比例的振幅。第二RF检测器检测具有在第二范围(例如,-20dBm至+ 20dBm)内的功率水平的接收到的RF信号的功率水平,并产生具有代表其幅度的相应的第二视频信号,从中产生具有幅度的输出信号。与此类接收信号成对数比例。从第二视频信号产生控制信号,该控制信号具有与接收到的RF信号的功率电平相对应的电平。具有等于​​或超过第一电平(例如,0dBm)的功率电平的接收到的RF信号根据控制信号电平被衰减并且耦合到第一检测器。限幅器响应于超过第二电平(例如,+ 5dBm)的所接收RF信号的功率电平,以根据超过第二电平的此类信号的功率电平来限制耦合到衰减器的这种RF信号的功率电平。通过这种布置,防止了耦合到第一检测器的RF信号超过第一水平,从而显着地将DLVA的恢复时间减少到例如小于500纳秒。

著录项

  • 公开/公告号US4758793A

    专利类型

  • 公开/公告日1988-07-19

    原文格式PDF

  • 申请/专利权人 RAYTHEON COMPANY;

    申请/专利号US19870013100

  • 发明设计人 MARC R. SHEADE;PAUL A. MURPHY;

    申请日1987-02-10

  • 分类号G06G7/24;H04B1/16;

  • 国家 US

  • 入库时间 2022-08-22 06:48:53

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