Direct current offset calibration device on the receiving path and direct current offset calibration method thereof

A direct current (DC) offset calibration device comprising:

• a signal generation unit configured to provide a first signal;
• a to-be-calibrated unit coupled to the signal generation unit, the to-be-calibrated unit being configured to receive the first signal and output a second signal accordingly, wherein the second signal is a clipped signal;
• a measurement unit coupled to the to-be-calibrated unit, the measurement unit being configured to receive a receiving signal correlated to the second signal, the receiving signal comprising an even harmonic resulted from the clipped signal, the measurement unit being configured to measure a magnitude of the even harmonic;
• and
• a compensation unit coupled to the measurement unit and the to-be-calibrated unit, the compensation unit being configured to compute and obtain a DC offset adjustment value according to the magnitude of the even harmonic, and to adjust the to-be-calibrated unit according to the DC offset adjustment value.