High-frequency signal processing apparatus and wireless communication apparatus

A high-frequency system unit comprising:

• a duplexer configured to communicate with an antenna;
• a first amplifying circuit configured to amplify a first input signal and output a first output signal to the antenna through the duplexer;
• a second amplifying circuit configured to amplify a second input signal received through the duplexer and output a second output signal;
• a source voltage generating circuit configured to supply a source voltage to the first amplifying circuit;
• a bias control circuit configured to control a bias of the first amplifying circuit;
• and
• first and second operation modes,
• wherein the source voltage generating circuit and the bias control circuit are configured to receive a power indication signal for indicating an average power level of the first output signal,
• wherein the source voltage generating circuit is configured to:
• generate the source voltage increasing in proportion to an increase of the average power level in the first operation mode, and
• generate the source voltage varying along an envelope of the first input signal in the second operation mode,
• wherein the bias control circuit is configured to:
• control the first amplifying circuit so as to supply the bias increasing in proportion to the increase of the average power level in the first operation mode, and
• control the first amplifying circuit so as to supply the bias having a fixed value in the second operation mode,
• wherein the first operation mode is performed when the average power level is smaller than a first reference value, and
• wherein the second operation mode is performed when the average power level is equal to or greater than the first reference value.