Exponential-incremental quantization-based calibration for capacitor mismatch in high-precision SAR ADCs

This brief proposes a foreground calibration method for high-precision SAR ADCs . The proposed calibration method is based on the principle of exponential incremental ADCs , which broadens the error detection range of the self-calibration method and effectively improves the calibration effect without modifying the CDAC or significantly increasing circuit complexity. The effectiveness of the proposed calibration method is validated in an 18-bit SAR ADC behavioral model in MATLAB, demonstrating SNDR/SFDR improvements of 30.41 dB and 43.09 dB, respectively, for an 18-bit SAR ADC.