Patent ID: 7639990

Claim:
A wireless communications device comprising: a common amplifier for amplifying a plurality of high-frequency signals of different communications systems; a plurality of signal channels provided subsequent to the common amplifier, each of the plurality of high-frequency signals being passed through the respective signal channels, and each of the plurality of signal channels having a power amplifier having power amplification efficiency optimal with respect to a high-frequency signal passed through the signal channel; a switch circuit provided between the plurality of signal channels and the common amplifier, for connecting the common amplifier and one of the plurality of signal channels, a common antenna for outputting each of the plurality of high-frequency signals; an antenna switch circuit provided between the common antenna and the plurality of signal channels, for connecting the common antenna and one of the plurality of signal channels; a control circuit for controlling the switch circuit and the antenna switch circuit; and a detecting circuit provided preceding the common amplifier, for extracting a phase-modulated signal by separating an amplitude-modulated component from each of the plurality of high-frequency signals, wherein the power amplifier is an EER amplifier for remodulating the phase-modulated signal based on the amplitude-modulated component.