Transmission circuit and communication device

摘要

Provided is a transmission circuit operating with high efficiency and low distortion. An amplitude and phase extraction section 11 extracts amplitude data and phase data from input data. A phase modulation section 12 phase-modulates the phase data to output a resultant signal as a phase-modulated signal. An amplifier section 13 amplifies the phase-modulated signal to output a resultant signal as a transmission signal. An amplitude control section 15 supplies, to the amplifier section 13 , a voltage controlled in accordance with an AC component represented by a fluctuation component of the amplitude data and a DC component represented by an average value level of the fluctuation component of the amplitude data.