您要說的若是mismatch error shaping SAR ADC, 可以參考下面這篇Ref: An Oversampling SAR ADC With DAC Mismatch Error Shaping Achieving 105 dB SFDR and 101 dB SNDR Over 1 kHz BW in 55 nm CMOS
若是cap mismatch的話, 找看看 cap mismatch calibration應該有蠻多文章可以參考的, 例如下面這篇
Ref: A 46uW 13 b 6.4 MS/s SAR ADC With Background Mismatch and Offset Calibration