High-frequency signal processing apparatus and wireless communication apparatus
A high-frequency signal processing apparatus and a wireless communication apparatus can achieve a decrease in power consumption. For example, when an indicated power level to a high-frequency power amplifier is equal to or greater than a second reference value, envelope tracking is performed by causing a source voltage control circuit to control a high-speed DCDC converter using a detection result of an envelope detecting circuit and causing a bias control circuit to indicate a fixed bias value. The source voltage control circuit and the bias control circuit indicate a source voltage and a bias value decreasing in proportion to a decrease in the indicated power level when the indicated power level is in a range of the second reference value to the first reference value, and indicate a fixed source voltage and a fixed bias value when the indicated power level is less than the first reference value.
1. A power amplifier module comprising:
a power amplifying circuit configured to amplify an input signal and to output an output signal, wherein:
the power amplifying circuit is configured to receive a source voltage and a bias signal,
the source voltage is configured to:
increase as an average power level of the output signal increases, when the power amplifier module is operating in a first operation mode, and
vary along an envelope of the input signal, when the power amplifier module is operating in a second operation mode,
the bias signal is configured to:
increase as the average power level increase, when the power amplifier module is operating in the first operation mode, and
maintain a fixed value, when the power amplifier module is operating in the second operation mode,
the power amplifier module is configured to operate in the first operation mode when the average power level is less than a reference value, and
the power amplifier module is configured to operate in the second operation mode when the average power level is equal to or greater than the reference value.
2. The power amplifier module according to claim 1 , wherein the source voltage is generated based on a source voltage control signal.
3. The power amplifier module according to claim 2 , wherein the source voltage control signal is a signal corresponding to a product of the average power level of the input signal and the envelope of the input signal.
4. A wireless communication apparatus comprising: a duplexer and;
a power amplifying circuit configured to amplify an input signal and to output an output signal, wherein:
the power amplifying circuit is configured to receive a source voltage and a bias signal,
the source voltage is configured to:
increase as an average power level of the output signal increases, when the power amplifier module is operating in a first operation mode, and
vary along an envelope of the input signal, when the power amplifier module is operating in a second operation mode,
the bias signal is configured to:
increase as the average power level increase, when the power amplifier module is operating in the first operation mode, and
maintain a fixed value, when the power amplifier module is operating in the second operation mode,
the power amplifier module is configured to operate in the first operation mode when the average power level is less than a reference value, and
the power amplifier module is configured to operate in the second operation mode when the average power level is equal to or greater than the reference value.
5. The wireless communication apparatus according to claim 4 , wherein the source voltage is generated based on a source voltage control signal.
6. The wireless communication apparatus to claim 5 , wherein the source voltage control signal is a signal corresponding to a product of the average power level of the input signal and the envelope of the input signal.