In order to implement the high resolution SAR ADC, a self-calibration arithmetic is proposed in this paper. The capacitor mismatch error is calculated by switching between two different work states. And then the error is loaded into the system for eliminating the mismatch error during the conversion cycle. Finally, a 14 bit SAR ADC system model with 0.5％ mismatch erfor is proposed and simulated successfully, and the correctness of the algorithm has been verified effectively.%为了实现高精度14 bit的逐次逼近型SAR(Successive Approximation)模数转换器ADC,提出一种数字自校准算法.该算法通过切换两种电容阵列的工作状态,得到电容之间的失配误差,并在ADC正常工作时,将得到的电容误差加载到电路中达到在转换过程消除失配的目的.最后对一个失配误差为0.5%的14 bit的SAR ADC系统模型进行参数仿真,结果验证了本数字校准算法的正确性和有效性.
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