Patent ID: 11909420
Assignee: ANRITSU CORPORATION
Field: Basic communication processes (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 3:
4. A linearity correction method of a signal generation apparatus including 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, and a correction data storage unit, the method comprising:
a step of acquiring actual data which is data of a level of an actual output signal at a predetermined frequency when a setting of a level of an output signal of the DA converter is changed at a predetermined level interval;
a step of creating 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 the actual data, and storing the created correction data in the correction data storage unit; and
a step of causing 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.