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141 条记录 (耗时 0.019 秒)

    HIGH-EFFICIENCY AMPLIFIER
    2.
    发明申请
    HIGH-EFFICIENCY AMPLIFIER 审中-公开

    公开(公告)号：US20180316326A1

    公开(公告)日：2018-11-01

    申请号：US15769874

    申请日：2016-10-21

    申请人： Airbus Defence and Space Limited

    发明人： Ian Morris ,  Nigel Wheatley ,  Nicolas Celerier

    IPC分类号： H03F3/58 ,  H03F1/06 ,  H03F3/68 ,  H03F3/189 ,  H01Q21/22 ,  H01Q1/28

    CPC分类号： H03F3/58 ,  B64G1/66 ,  H01Q1/288 ,  H01Q21/22 ,  H03F1/06 ,  H03F3/189 ,  H03F3/604 ,  H03F3/68 ,  H03F2200/258 ,  H03F2200/451

    摘要： There is provided an electronic amplification apparatus (40) comprising a travelling wave tube amplifier (20) and a limiter (10), wherein the configuration of the amplifier (20) is optimised whilst maintaining signal linearity for operation with improved DC power efficiency at an operating point below saturation, and the limiter (10) is arranged to prevent the output power of the amplifier from going beyond a predetermined limit. This can prevent possible damage. There is also provided a multiport amplifier system (50) containing the electronic amplification apparatus (40), and a multi-feed, multi-amplifier phased array type antenna system (130) containing the electronic amplification apparatus (40), and a satellite communications system comprising the electronic amplification apparatus (40) or the multiport amplifier system (50) or the multi-feed, multi-amplifier phased array type antenna system (130).

    METHOD FOR PRODUCING AN AMPLIFICATION STAGE FOR A VARIABLE ENVELOPE SIGNAL
    3.
    发明申请
    METHOD FOR PRODUCING AN AMPLIFICATION STAGE FOR A VARIABLE ENVELOPE SIGNAL 审中-公开

    公开(公告)号：US20180316320A1

    公开(公告)日：2018-11-01

    申请号：US15773051

    申请日：2016-11-03

    申请人： CENTRE NATIONAL D'ÉTUDES SPATIALES C N E S

    发明人： Geoffroy SOUBERCAZE-PUN ,  Luc LAPIERRE

    IPC分类号： H03F1/56 ,  H03F1/02 ,  H03F3/19 ,  H03F3/21 ,  H03F3/22 ,  H03F1/06 ,  H03F3/189 ,  H03F3/58

    摘要： Disclosed is a method for producing a stage for amplifying the power of a variable envelope signal including at least one amplifier. For each amplifier, a form of ideal variation in average power POUTL is selected. For each value of each setting parameter and for each average input power value, a value of an optimisation criterion is calculated on the basis of the mathematical expectation of at least one optimisation parameter. An optimum value of each setting parameter is determined and the amplification stage is produced with a number of amplifiers in parallel determined on the basis of an average output power value and with, for each amplifier, matching circuits providing the optimum values of the setting parameters. The invention also relates to an amplification stage produced in this manner.

    Power booster using peak suppression and pre-distortion for terminal radios
    5.
    发明申请
    Power booster using peak suppression and pre-distortion for terminal radios 有权
    功率增强器使用终端无线电的峰值抑制和预失真

    公开(公告)号：US20050141639A1

    公开(公告)日：2005-06-30

    申请号：US10747519

    申请日：2003-12-30

    申请人： Kiomars Anvari

    发明人： Kiomars Anvari

    IPC分类号： H03F1/02 ,  H03F1/06 ,  H03F1/32 ,  H04B1/04 ,  H04K1/02

    CPC分类号： H04B1/0475 ,  H03F1/02 ,  H03F1/0205 ,  H03F1/3241 ,  H03F1/3247 ,  H03F1/3282 ,  H03F2201/3233 ,  H04B2001/0425

    摘要： A technique to boost the output power of portable radio terminals without increasing the power dissipation is described. The input to the terminal transmit amplifier is modified by a peak-to-average reduction and amplitude pre-distortion circuit, prior to being applied to the amplifier. The peak-to-average reduction and pre-distortion circuit clips the baseband samples before applying any amplitude pre-distortion if they exceed a predefined value The peak-to-average reduction and pre-distortion circuit uses a lookup table to pre-distort the peak-to-average reduced signal. The amplitude pre-distortion lookup table is being updated at power up or power down of the terminal radio, during idle time, just before origination of a call, before termination of a call, or while the call is active. During the updating of the lookup table the radio could be in its normal transmit mode, or transmit into a dummy load using an analog transmit switch controlled from the peak-to-average reduction and pre-distortion circuit.

    摘要翻译： 描述了在不增加功率消耗的情况下提高便携式无线电终端的输出功率的技术。 在施加到放大器之前，终端发射放大器的输入由峰值平均减小和幅度预失真电路修改。 峰均平均减少和预失真电路在施加任何幅度预失真之前剪切基带采样，如果它们超过预定值，则峰均平均减少和预失真电路使用查找表来预失真 峰均平均降低信号。 振幅预失真查找表在终端无线电的上电或掉电期间，在空闲时间，呼叫发起之前，呼叫结束之前，或在呼叫激活时正在更新。 在更新查找表期间，无线电可以处于其正常发射模式，或者使用从峰值平均减少和预失真电路控制的模拟发射开关发射到虚拟负载。

    System for the transmission of a composite television signal
    6.
    发明授权
    System for the transmission of a composite television signal 失效
    用于传输复合电视信号的系统

    公开(公告)号：US4263617A

    公开(公告)日：1981-04-21

    申请号：US076776

    申请日：1979-09-18

    申请人： Henri Chemin ,  Claude Cluniat ,  Bernard Beltzer

    发明人： Henri Chemin ,  Claude Cluniat ,  Bernard Beltzer

    IPC分类号： H03F1/06 ,  H04N5/40 ,  H04N5/38

    CPC分类号： H03F1/06 ,  H04N5/40 ,  H03F2200/198

    摘要： The transmission system essentially involves separate amplification followed by a combination under predetermined conditions of relative amplitude and phase, of a carrier signal modulated by the video-frequency information and having a reduced carrier level with the same unmodulated carrier, thus permitting a considerable improvement in both efficiency and reliability of conventional transmitters.

    摘要翻译： 传输系统基本上涉及在由视频频率信息调制的载波信号的相对幅度和相位的预定条件下进行单独的放大，并且具有相同的未调制载波的载波电平降低，从而允许两者的显着改善 传统发射机的效率和可靠性。