Signal generation apparatus and linearity correction method thereof

A signal generation apparatus comprising:

• a signal generation unit that generates any digital signal;
• a level conversion unit that adjusts a level of the digital signal generated by the signal generation unit;
• a DA converter that converts the digital signal of which the level is adjusted by the level conversion unit into an analog signal having a predetermined frequency;
• an amplifier that amplifies the analog signal converted by the DA converter;
• a frequency conversion unit that converts the frequency of the analog signal amplified by the amplifier;
• a correction data storage unit;
• and
• a control unit,
• wherein the DA converter is configured to adjust a level of an output signal,
• the control unit creates correction data for correcting a linearity of the level of the output signal of the DA converter, for all frequencies to be used, based on actual data which is data of a level of an actual output signal at a predetermined frequency when a setting of the level of the output signal of the DA converter is changed at a predetermined level interval, and stores the created correction data in the correction data storage unit, and
• the control unit causes the level conversion unit to adjust the level of the digital signal, which is an input signal of the DA converter, based on the correction data stored in the correction data storage unit.