17.
    发明专利
    未知

    公开(公告)号:FR2666709A1

    公开(公告)日:1992-03-13

    申请号:FR9110585

    申请日:1991-08-23

    Applicant: MOTOROLA INC

    Abstract: A gain control system for controlling signal levels of the signal (94) received by a receiver. The gain control system is operable to control the signal levels of the signal when the signal is comprised of either a conventional, constant envelope signal (158), such as an FM signal, or a non-constant envelope signal (142), such as a TDMA composite modulated signal. The gain control system may be advantageously embodied in a dual-mode radiotelephone operable to receive both conventional, FM signals and TDMA, composite modulated signals.

    POWER AMPLIFIER FOR RADIOTELEPHONE USABLE IN EITHER LINEAR OR SATURATED MODE

    公开(公告)号:GB2245789A

    公开(公告)日:1992-01-08

    申请号:GB9112389

    申请日:1991-06-10

    Applicant: MOTOROLA INC

    Abstract: A dual mode power amplifier operable in etiher the linear mode or the saturation mode. The power amplifier, when comprising a portion of a radio transmitter, permits efficient amplification of either a frequency modulated or a composite modulated signal by operation of the amplifier in the saturation mode or the linear mode, respectively. A processor determines the modulation-type of the signal and generates a signal to cause operation of the amplifier in either the saturation mode or the linear mode.

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