Capacitive recombination calibration method to improve the performance of SAR ADC

Abstract

This paper proposes a new capacitor recombination calibration method to compensate the capacitor mismatch of successive approximation register analog-to-digital converter (SAR ADC). This method focuses on automatically calibrating the mismatch of the SAR ADC capacitors to improve the static performance (Integral Non-Linearity, INL; Differential NonLinearity, DNL) and dynamic performance (Spur Free Dynamic Range, SFDR; Signal to Noise and Distortion Ratio, SNDR). The Monte Carlo method is used to verify the calibration of 14-bit, 16- bit, and 18-bit SAR ADC. The results show that this method can make the SAR ADC obtain more stable and better performance parameters.