Signal generator, signal generation method, and numerically controlled oscillator

A signal generation method for generating a first frequency signal and a second frequency signal that differs in a phase from the first frequency signal, the method comprising:

• generating first and second correction values correcting the first and the second frequency signals in accordance with a phase indicated by a phase signal, respectively, by inputting the phase signal generated at a first phase interval;
• generating the first frequency signal of the first phase interval on the basis of the phase signal, a parameter to generate the first frequency signal, and the first correction value generated in the correction value generation step;
• and
• generating the second frequency signal of the first phase interval on the basis of the phase signal, a parameter to generate the second frequency signal, and the second correction value generated in the correction value generation step,
• wherein the first and the second correction values are generated by using one parabolic waveform data.

A numerically controlled oscillator, comprising:

• phase signal generation unit for generating a phase signal of a first phase interval, and
• signal generation unit for generating a first frequency signal and a second frequency signal that differs in a phase from the first frequency signal on the basis of the phase signal;
• wherein the signal generation unit comprises:
• a first parameter table for storing a parameter to generate the first frequency signal;
• a second parameter table for storing a parameter to generate the second frequency signal;
• correction value generation unit, that the phase signal generated by the phase signal generation unit is inputted to, for generating first and second correction values correcting the first and the second frequency signals in accordance with a phase indicated by the phase signal, respectively;
• first signal generation unit for generating the first frequency signal of the first phase interval on the basis of the phase signal, the parameter of the first parameter table, and the first correction value generated in the correction value generation unit;
• and
• second signal generation unit for generating the second frequency signal of the first phase interval on the basis of the phase signal, the parameter of the second parameter table, and the second correction value generated by the correction value generation unit.