摘要： 时间交织型SAR ADC对包括电容失配在内的通道间失配较敏感，其中电容失配既包括通道内的失配也包括通道间的失配，是影响时间交织型SAR ADC性能的重要因素。为了提升时间交织型SAR ADC的性能，基于对SAR ADC中DAC电容失配对时间交织型SAR ADC影响的分析，结合单通道低速工作SAR ADC的电容校正方法，提出了一套适用于时间交织型SAR ADC的电容校正方法，实现了超过9 dB的SFDR和超过2.5 dB的SNDR性能提升。

中图分类号： TN432
文献标识码： ADOI：10.16157/j.issn.0258-7998.201177
中文引用格式： 杨荣彬，徐振涛. 一种用于时间交织型SAR ADC的电容校正技术[J].电子技术应用，2021，47(7)：44-47.
英文引用格式： Yang Rongbin，Xu Zhentao. A calibration technique for capacitor mismatches of time-interleaved SAR ADC[J]. Application of Electronic Technique，2021，47(7)：44-47.

A calibration technique for capacitor mismatches of time-interleaved SAR ADC

Abstract： The time-interleaved SAR ADC is sensitive to mismatch between channels. The key factor is the capacitor mismatch, both in channel and between channels. This paper analyzes the impacts of capacitor mismatches in DAC of SAR(Successive-Approximation-Register) ADC on time-interleaved SAR ADC. For improving performance of time-interleaved SAR ADC, a calibration technique based on calibration of capacitor mismatches in single low-speed SAR ADC is proposed, which results in improvement of SFDR(Spurious Free Dynamic Range) exceed 9 dB and SNDR(Signal to noise distortion ratio) exceed 2.5 dB。

Key words : time-interleave；SAR ADC；capacitor mismatches；calibration technique