Communication terminal, automobile communication terminal, and automobile
    1.
    发明授权
    Communication terminal, automobile communication terminal, and automobile 失效
    通信终端,汽车通信终端和汽车

    公开(公告)号:US06952565B1

    公开(公告)日:2005-10-04

    申请号:US10110345

    申请日:1999-10-13

    CPC classification number: H04B1/40

    Abstract: The present invention provides a communication terminal that enables precise communications with optimum receive sensitivity at any time regardless of any change in peripheral environments of an antenna thereof. The communication terminal including means for transmitting and receiving radio waves is provided with a training mechanism for enabling the communication terminal itself to conduct training mode for tuning receive sensitivity, and switching mechanism for switching between normal communication mode and the training mode. The communication terminal is particularly useful as a communication terminal for automobile in the Intelligent Transport System or the like.

    Abstract translation: 本发明提供了一种通信终端,其能够在任何时候实现具有最佳接收灵敏度的精确通信,而不管其天线的外围环境如何变化。 通信终端包括用于发送和接收无线电波的装置,设置有用于使通信终端本身能够进行用于调整接收灵敏度的训练模式的训练机制,以及用于在正常通信模式和训练模式之间切换的切换机制。 通信终端在智能交通系统等中作为汽车的通信终端特别有用。

    Power amplifier module
    5.
    发明授权
    Power amplifier module 失效
    功率放大器模块

    公开(公告)号:US06816017B2

    公开(公告)日:2004-11-09

    申请号:US09931877

    申请日:2001-08-20

    CPC classification number: H03F3/19 H03F1/0261 H03F1/302 H03F3/347 H03F2200/444

    Abstract: A power amplifier module is provided with a function of protecting an amplifying device against destruction caused by a standing wave by reflection from an antenna end in load variation. Increase in base current from idling current of a final stage amplifying portion GaAs-HBT in load variation is detected and canceled and collector current is restrained to thereby prevent an increase in output and prevent destruction of GaAs-RET. By also using a function of successively lowering idling current when power source voltage is elevated and a clipping function of diodes connected in parallel with output stage GaAs-RET, voltage as well as current more than necessary are avoided from being applied on the output stage GaAs-RET.

    Abstract translation: 功率放大器模块具有保护放大装置的功能,以防止由负载变化引起的天线反射引起的驻波的破坏。 检测并抵消了负载变化中的最终级放大部分GaAs-HBT的空载电流的基极电流的增加,并抑制集电极电流,从而防止输出增加并防止GaAs-RET的破坏。 通过使用在电源电压升高时连续降低空载电流并且与输出级GaAs-RET并联连接的二极管的限幅功能也被避免施加在输出级GaAs上的功能。 -RET。

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