Abstract: A radio communication apparatus transmits a transmission signal amplified by a first amplifier via a circulator and amplifies a received signal received via the circulator by a second amplifier. The radio communication apparatus includes: a controller that outputs control information based on a signal level between the first amplifier and the circulator; and a phase shifter that is provided between the circulator and the second amplifier and adjusts a phase of a reflected wave generated from an input side of the second amplifier based on the control information.

Abstract: A wireless apparatus including: an amplification circuit configured to generate a second signal by amplifying power of a first signal, a calculation circuit configured to calculate a deviation amount of phase deviation of the second signal from the first signal, and a correction circuit configured to correct the phase deviation using a correction method that is selected from a plurality of correction methods based on the deviation amount, the plurality of correction methods among which each power consumption is higher as each correction amount corresponding to each power consumption is greater.

Abstract: A radio communication device includes an amplifier configured to amplify an electric signal to be transmitted; and a controlling section configured to set an operating point voltage of the amplifier to a first voltage for increasing a temperature in the amplifier in a non-transmission period after a reception period and before a transmission period and set the operating point voltage of the amplifier to a second voltage that is lower than the first voltage and higher than a pinch-off voltage in the transmission period.

Abstract: A wireless apparatus including: an amplification circuit configured to generate a second signal by amplifying power of a first signal, a calculation circuit configured to calculate a deviation amount of phase deviation of the second signal from the first signal, and a correction circuit configured to correct the phase deviation using a correction method that is selected from a plurality of correction methods based on the deviation amount, the plurality of correction methods among which each power consumption is higher as each correction amount corresponding to each power consumption is greater.

Abstract: In an amplification device, an amplification unit has a transistor and amplifies a signal that is input. A control unit applies, when a power source is turned on, a pinch-off voltage to a gate of the transistor before applying a drain bias voltage to a drain of the transistor and then applies a gate bias voltage to the gate of the transistor.

Abstract: A PAPR determining device includes a detecting unit and a PAPR determining unit. The detecting unit detects a predetermined value's changes, which is a cause of changes in a saturation power of a power amplifier. When the detecting unit detects any change in the predetermined value, the PAPR determining unit determines a PAPR value that corresponds to the saturation power of the power amplifier.

Abstract: An amplifier includes an envelope detection unit that detects an envelope of a transmission signal; a comparing unit that compares a voltage of the envelope with a reference voltage; a selecting unit that selects, in accordance with a comparison result obtained by the comparing unit, an amplifying element that amplifies the transmission signal from among a plurality of amplifying elements each having different operating power; a voltage control unit that controls, in accordance with the envelope, a voltage that is used to amplify the transmission signal in the amplifying element that is selected by the selecting unit; a current measuring unit that measures a current of a power supply that supplies the voltage that is controlled by the voltage control unit; and a reference voltage control unit that controls the reference voltage such that the current measured by the current measuring unit decreases.

Abstract: An amplifier includes an envelope detection unit that detects an envelope of a transmission signal; a comparing unit that compares a voltage of the envelope with a reference voltage; a selecting unit that selects, in accordance with a comparison result obtained by the comparing unit, an amplifying element that amplifies the transmission signal from among a plurality of amplifying elements each having different operating power; a voltage control unit that controls, in accordance with the envelope, a voltage that is used to amplify the transmission signal in the amplifying element that is selected by the selecting unit; a current measuring unit that measures a current of a power supply that supplies the voltage that is controlled by the voltage control unit; and a reference voltage control unit that controls the reference voltage such that the current measured by the current measuring unit decreases.

Abstract: A PAPR determining device includes a detecting unit and a PAPR determining unit. The detecting unit detects a predetermined value's changes, which is a cause of changes in a saturation power of a power amplifier. When the detecting unit detects any change in the predetermined value, the PAPR determining unit determines a PAPR value that corresponds to the saturation power of the power amplifier.

Abstract: In an amplifying device, an amplification unit includes a first amplifier which amplifies a signal and a second amplifier which amplifies a signal when the signal has a predetermined level or more. A detector detects a temperature change. A calculation unit calculates an adjacent channel leakage power ratio of an output signal output from the amplification unit based on detection of the temperature change of the detector. A controller controls gate biases of the first and second amplifiers based on the adjacent channel leakage power ratio calculated by the calculation unit.

Abstract: In an amplifying device, an amplification unit includes a first amplifier which amplifies a signal and a second amplifier which amplifies a signal when the signal has a predetermined level or more. A detector detects a temperature change. A calculation unit calculates an adjacent channel leakage power ratio of an output signal output from the amplification unit based on detection of the temperature change of the detector. A controller controls gate biases of the first and second amplifiers based on the adjacent channel leakage power ratio calculated by the calculation unit.