POWER CIRCUIT AND RADIO COMMUNICATION CIRCUIT USING SAME AND METHOD OF OPERATING A CIRCUIT
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.
1 . A power circuit that includes an output circuit including 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 comprising:
an envelope signal-extracting unit configured to extract an envelope signal from a carrier wave;
a simulation signal-waveform generating unit configured to generate a simulation signal including a fluctuation component occurring when the envelope signal is transmitted to the output circuit;
a fluctuation component-extracting unit configured to extract the fluctuation component included in the simulation signal; and
an inverted component-generating unit configured to generate an inverted component obtained by performing a phase inversion for the fluctuation component, and
wherein the fluctuation component occurring in the output circuit is canceled out through the inverted component.
2 . The power circuit according to claim 1 , comprising:
a peak component-extracting unit configured to extract a peak component from the simulation signal;
an amplifying unit configured to amplify the extracted peak component; and
a transformation unit configured to transform the inverted component, and
wherein the output circuit is configured to add the amplified peak component to the transformed inverted component and an amplification rate of the amplifying unit is equal to a transformation rate of the transformation unit.
3 . The power circuit according to claim 1 , comprising:
a peak component-extracting unit configured to extract a peak component from the simulation signal;
an addition unit configured to add an output signal of the peak component-extracting unit to an output signal of the inverted component-generating unit;
an amplifying unit configured to amplify an output signal of the addition unit; and
a direct current component-output unit configured to output a direct current component included in the driving voltage, and
wherein the output circuit is configured to add an output signal of the amplifying unit to a direct current component transmitted from the direct current component-output unit.
4 . The power circuit according to claim 1 , comprising:
a driving voltage-detecting unit configured to detect the driving voltage supplied to the amplifier; and
an adjusting unit configured to adjust the driving voltage so that the driving voltage detected through the driving voltage-detecting unit becomes similar to an envelope signal output from the envelope signal-extracting unit.
5 . A radio communication circuit, comprising:
the power circuit according to claim 1 ; and
a final stage amplifier configured to output a signal in synchronization with the envelope signal, where the driving voltage is applied from the power circuit to the signal.
6 . A method of controlling a power circuit, comprising:
removing a variation component occurring during a process of amplifying an envelope signal by performing a phase inversion for the variation component; and
externally transmitting a radio communication signal in synchronization with the envelope signal.