RADIO-FREQUENCY CIRCUIT

A power amplifier circuit and an LC circuit are included. The power amplifier circuit amplifies a radio frequency signal by switching between the first mode, in which power is amplified by using the envelope tracking system, and the second mode, in which power is amplified by using the average power tracking system. The LC circuit is connected, at its first end, to the power supply path of the power amplifier circuit and that is grounded, at its second end, through a switch circuit. The LC circuit includes a first capacitor and an inductor that is connected in series to the first capacitor. The switch circuit is controlled to be switched off in the first mode and is controlled to be switched on in the second mode.