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    • 3. 发明专利
    • PORTABLE RADIO-COMMUNICATION DEVICE
    • JP2000274126A
    • 2000-10-03
    • JP2000034768
    • 2000-02-14
    • DAIMLER CHRYSLER AG
    • REINHARDT MATTHIAS
    • B60R25/00B60R25/10E05B49/00H03G3/30H04B1/04
    • PROBLEM TO BE SOLVED: To provide a portable radio-communication device used as a remote controller for an access authorizing system and/or a drive anthorizing system for a vehicle. SOLUTION: This portable radio-communication device is provided with a voltage-generating part, an electric power-adjustable amplification stage for amplituding an AC voltage signal, an electric power adjusting circuit provided with an operational amplifier op1 one of input of which supplies a preset voltage and the other part thereof supplies a feedback voltage signal through rectifier stages, and a transmitting antenna in which an amplified AC voltage signal is supplied. The voltage signal generator includes an oscillator 1 and the amplification stage includes at least one bipolar transister connected to the oscillator 1 making use of a base. A current adjusting element controlled by the operation output is connected to the collector emitter current passage. The rectifier stage comprises one or two diodes parallelly and reversely connected, a capacitor and a resistance parallelly connected to the operational amplifier op1. This device is used as a remote controller for an access authorizing system and/or a drive authorizing system for vehicles.