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Abstract

A radio transmitter comprises a data burst randomizer for determining a transmission rate corresponding to a voice signal, an IF synthesizer for generating an IF signal for modulating the voice signal, a modulator for modulating the voice signal on the basis of the IF signal, a main synthesizer for generating an RF signal for frequency conversion, a frequency converter for subjecting the modulated signal to frequency conversion based on the RF signal, and amplifiers for amplifying and outputting the modulated signal. Power is supplied at least to the IF synthesizer, the modulator and the frequency converter at timings based on the determined transmission rate, and also based on periods required for settling the IF synthesizer and the main synthesizer. By virtue of this structure, more reliable reduction of current consumption can be achieved, while securing stable operations of the synthesizers.

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First Claim