Abstract: An amplifying device which amplifies a signal, includes: an amplifier which amplifies an input signal by a power supplied from a power node; a first power source which supplies a fixed voltage to the power node; a second power source which supplies a variable voltage to the power node based on an envelope signal relating to the input signal and voltage of the power node; an active short device which reduces impedance of the power node when the first power source supplies the power to the power node and the second power source does not supply the power to the power node; a synthesizer which synthesizes the envelope signal and a cancel signal so that the second power source does not supply the power to the power node according to voltage variation of the power node by the active short device.

Abstract: An amplifying apparatus includes an amplifier that amplifies a signal, using a voltage supplied; a power source unit that generates a first voltage and a second voltage having an amplitude greater than that of the first voltage; and a switching controller that, when the an envelope signal of the signal becomes current zero, switches between and supplies to the amplifier, the first voltage and the second voltage generated by the power source unit.

Abstract: An amplifying device which amplifies a signal, includes: an amplifier which amplifies an input signal by a power supplied from a power node; a first power source which supplies a fixed voltage to the power node; a second power source which supplies a variable voltage to the power node based on an envelope signal relating to the input signal and voltage of the power node; an active short device which reduces impedance of the power node when the first power source supplies the power to the power node and the second power source does not supply the power to the power node; a synthesizer which synthesizes the envelope signal and a cancel signal so that the second power source does not supply the power to the power node according to voltage variation of the power node by the active short device.

Abstract: A power supply apparatus includes a detector configured to detect a peak of a transmission signal, a determination unit configured to determine a timing when a change of a variable voltage which is output from the apparatus and which corresponds to the detected peak of the transmission signal is started in accordance with a voltage value corresponding to the peak and a change rate of the variable voltage, a generation unit configured to generate a variable voltage control signal used to start the change of the voltage at the determined timing, and an output unit configured to output a voltage in accordance with the generated variable voltage control signal.

Abstract: A power circuit and method thereof are provided. The power circuit includes an output circuit having an alternating current-coupling element and that supplies an output signal of the output circuit to an amplifier as a driving voltage. The power circuit includes an envelope signal-extracting unit extracting an envelope signal from a carrier wave, a simulation signal-waveform generating unit generating a simulation signal including a fluctuation component occurring when the envelope signal is transmitted to the output circuit, a fluctuation component-extracting unit extracting the fluctuation component included in the simulation signal, and an inverted component-generating unit generating an inverted component obtained by performing phase inversion for the fluctuation component, where the fluctuation component occurring in the output circuit is canceled out through the inverted component.

Abstract: An amplifying circuit includes: an amplifying unit which amplifies an input signal and applies the amplified signal to a designated load; a current detection unit which detects a load current that flows into the designated load upon application of the amplified signal; an estimating unit which calculates, based on the voltage level of the input signal, an estimated value of the load current to be supplied to the load; and an adjusting unit which adjusts an input bias, to be applied to the amplifying unit, in such a manner so as to reduce a difference value representing a difference between the estimated value and the load current detected by the current detection unit.

Abstract: An amplifying apparatus includes an amplifier that amplifies a signal, using a voltage supplied; a power source unit that generates a first voltage and a second voltage having an amplitude greater than that of the first voltage; and a switching controller that, when the an envelope signal of the signal becomes current zero, switches between and supplies to the amplifier, the first voltage and the second voltage generated by the power source unit.

Abstract: An amplifying circuit includes: an amplifying unit which amplifies an input signal and applies the amplified signal to a designated load; a current detection unit which detects a load current that flows into the designated load upon application of the amplified signal; an estimating unit which calculates, based on the voltage level of the input signal, an estimated value of the load current to be supplied to the load; and an adjusting unit which adjusts an input bias, to be applied to the amplifying unit, in such a manner so as to reduce a difference value representing a difference between the estimated value and the load current detected by the current detection unit.