A 12-bit 200KS/s SAR ADC with Digital Self-Calibration

摘要：

　　Aiming at the application of neural signal detection system,this paper designs a 12-bit 200KS/s high resolution successive approximation analog-to-digital converter(SAR ADC)fabricated in SMIC 0.18-μm process.An optimized digital self-calibration technique is proposed to correct the static offset of the comparator and the mismatch of the capacitor array by using a correction capacitor array,achieving 1-bit improvement of ENOB.Simulation results show that,when the input signal is 46K,the ADC fulfills an SNDR of 71.55dB and an SFDR of 91.82dB with a 200KS/s sampling rate,while the ADC only can achieve an SNDR of 65.85dB and an SFDR of 78.83dB before calibration.With the ENOB of 11.59 bit,the self-calibration SAR ADC consumes 336μW at 1.8 V power supply.

关键词： neural signal SAR ADC high-precision digital self-calibration offset correction

作者: Xiaojie Zhang Maodong Wang Liyang Guo Xinghua Wang

作者单位: School of Information and Electronics Beijing Institute of Technology Beijing,China

会议类型: 国际会议

会议名称: 2017 IEEE 2nd Advanced Information Technology,Electronic and Automation Control Conference(IAEAC 2017)(2017 IEEE 第2届先进信息技术、电子与自动化控制国际会议)

会议地点: 重庆

会议语种:英文

页码: 2531-2535

在线出版日期: 2017-03-25（万方平台首次上网日期，不代表论文的发表时间）