A wireless apparatus includes a clock generation PLL circuit of a digital baseband section. A variable output regulator receives as an input a VCO control voltage for controlling an oscillation frequency of a VCO in the PLL circuit, varies an output voltage in accordance with the VCO control voltage, and supplies, as a supply voltage, the output voltage to a power terminal of a high frequency circuit, such as an amplifier. The VCO control voltage changes in accordance with temperature or process variations, and the supply voltage of the high frequency circuit is controlled in accordance with the VCO control voltage. For this reason, performance deterioration ascribable to the temperature or process variations can be compensated for.