Direct current offset calibration device on the receiving path and direct current offset calibration method thereof
AssigneeRichWave Technology Corp.
InventorShun-Pin Yang
Life of this patent
Estimating the term…
Abstract
A direct current (DC) offset calibration device and a method are used to calibrate a DC offset of a unit. The DC offset calibration device includes a signal generation unit, a to-be-calibrated unit, a measurement unit, and a compensation unit. The DC offset calibration method includes: using the to-be-calibrated unit to output a clipped signal resulting from a signal saturation effect; receiving a receiving signal correlated to the clipped signal, the receiving signal including an even harmonic resulting from the clipped signal; measuring a magnitude of the even harmonic to obtain a DC offset adjustment value accordingly; and adjusting the to-be-calibrated unit according to the DC offset adjustment value to calibrate the DC offset.
Claims20
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.
A DC offset calibration method, used to calibrate a DC offset of a to-be-calibrated unit, the method comprising:
- the to-be-calibrated unit outputting a second signal, wherein the second signal is clipped due to a signal saturation effect of the to-be-calibrated unit, and wherein the second signal is clipped asymmetrically further due to the DC offset of the to-be-calibrated unit;
- receiving a receiving signal correlated to the second signal, wherein the receiving signal includes an even harmonic resulting from asymmetrical clipping;
- measuring a magnitude of the even harmonic;
- computing a DC offset adjustment value according to the magnitude of the even harmonic;
- and
- adjusting the to-be-calibrated unit according to the DC offset adjustment value to calibrate the DC offset.
Dependencies are inferred from the claim text.