1 results about "Spurious-free dynamic range" patented technology

The application discloses a digital-to-analog converter and a current calibration device and method thereof, the current calibration method comprising: comparing the output current of a to-be-calibrated current source of the digital-to-analog converter with the output current of a reference current source and outputting an error signal; generating a calibration control code according to the error signal by using a successive approximation algorithm; and controlling a calibration current source to inject corresponding compensation current into the to-be-calibrated current source according to the calibration control code, wherein at least one redundant bit is included in the calibration bits of the calibration control code, and the value of the redundant bit is a positive integer less than N, wherein N is the number of calibration precision bits. The successive approximation algorithm with the redundant bit is adopted, even if a single misjudgment occurs during calibration, the previous error can be corrected in subsequent low-bit calibration, and the calibration stability and calibration precision are significantly improved. Further, the gradient alignment algorithm is adopted, so that the output current of the calibrated current source presents staggered distribution, and the linearity and the spurious-free dynamic range of the signal can be improved.