| 摘要 |
PROBLEM TO BE SOLVED: To increase an accuracy of transmitting power control (power control) of radio transmission. SOLUTION: The transmitting power level of a transmitting power control circuit is determined by selecting one of a plurality of predetermined DC voltage levels. This transmitting power control circuit is equipped with variable gain amplification parts (208, 308, 408) which receive an amplitude-modulated signal and vary amplification gains according to a gain control signal, power amplification parts (210, 310, 410) which provide a transmission output signal, power detectors (220, 320, 420) which are coupled with a coupler for extracting part of the transmission output signal and perform detection for the transmission output signal, and a reference voltage generation part. A reference voltage signal is found on the basis of the selected DC voltage level and a signal whose envelope component can be extracted.
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