Patent ID: 7911254

Claim:
A direct-current-offset correction device comprising: a digital-to-analog converter that converts a digital signal into an analog signal; a modulator that modulates the analog signal to generate a modulated signal; a direct-current-offset correction value calculation unit that calculates a direct-current-offset correction value as a reverse characteristic component of a carrier leak occurring in the modulated signal based on a demodulated signal which is demodulated by feeding back the modulated signal; a direct-current-offset correction unit that corrects a direct-current-offset on the digital signal based on the direct-current-offset correction value; a correction value detection unit that detects whether or not the direct-current-offset correction value is zero or a neighboring value of zero; and an offset generation unit that superimposes a direct-current-offset component on the analog signal based on a detection result of the correction value detection unit.