Oscillator, radio communication device, and radio communication method

A radio communication device comprising:

• an RF unit comprising a transmitting circuit and a receiving circuit;
• and
• a baseband unit comprising a transmission processing circuit and a reception processing circuit,
• wherein the receiving circuit comprises:
• an oscillator which comprises a first variable capacitor to adjust capacitance based on a first signal and a second variable capacitor to adjust capacitance based on a second signal, generates an oscillation signal having a frequency in accordance with the capacitance of the first variable capacitor and the second variable capacitor;
• an integer phase detector to detect an integer phase of the oscillation signal;
• a fractional phase detector to detect a fractional phase of the oscillation signal based on a third signal as a reference and the oscillation signal;
• a phase error generator to generate a fourth signal indicating a phase error of the oscillation signal, based on the integer phase, the fractional phase, and a frequency control signal;
• a first filter to extract the first signal in a predetermined frequency band, included in the fourth signal, and to output the first signal in asynchronization with the third signal;
• and
• a second filter to extract the second signal in a predetermined frequency band, included in the fourth signal, and to output the second signal in synchronization with the third signal.

A radio communication method comprising:

• generating an oscillation signal having a frequency in accordance with of capacitance of a first variable capacitor that adjusts the capacitance based on a first signal and a second variable capacitor that adjusts the capacitance based on a second signal;
• detecting an integer phase of the oscillation signal;
• detecting a fractional phase of the oscillation signal based on a third signal as a reference and the oscillation signal;
• generating a fourth signal indicating a phase error of the oscillation signal, based on the integer phase, the fractional phase, and a frequency control signal;
• extracting the first signal in a predetermined frequency band, included in the fourth signal so as to output the first signal in asynchronization with the third signal;
• and
• extracting the second signal in a predetermined frequency band, included in the fourth signal so as to output the second signal in synchronization with the third signal.