Design of capacitor array in 16-bit ultra high precision SAR ADC for the wearable electronics application

Cen, Y. et al. (2020) Design of capacitor array in 16-bit ultra high precision SAR ADC for the wearable electronics application. IEEE Access, 8, pp. 175230-175243. (doi: 10.1109/ACCESS.2020.3024807)

Abstract

This paper proposes a 16-bit 6-channel high-voltage successive approximation register (SAR) ADC with an optimized 5+5+6 segmented capacitor array. The lower 10 bits of the capacitor array are all composed of unit capacitors without any calibration unit. Without calibration, the lower 10 bits of the capacitor array can ensure 10-bit conversion accuracy. Every of the upper 6 bits of the capacitor array contains a linearity calibration unit. The linearity error of the upper 6 bits is calibrated by the linearity calibration unit. The 16-bit is manufactured by a 0.6μm standard COMS process, and the total chip area of 6-channel ADC including pads is 6.6mm × 6.6mm. As for single channel SAR ADC, the area is 0.9mm × 2.0mm. The measurement results show that the effective conversion accuracy of the SAR ADC reaches 13 bits by using novel differential nonlinearity (DNL) and integral nonlinearity (INL) calibration methods. The power is 80mW, corresponding to a Figure of Merit (FOM) of 48 pJ/conv.-step.

• Item Type: Articles
• Additional Information: The work of Hua Fan was supported by the National Natural Science Foundation of China (NSFC) under Grant 61771111, supported by Sichuan Provincial Science and Technology Important Projects under Grant 19ZDYF2863, as well as supported by China Postdoctoral Science Foundation under grant 2017M612940 & 2019T120834 and Special Foundation of Sichuan Provincial Postdoctoral Science Foundation. The work of Quanyuan Feng was supported by the National Natural Science Foundation of China (NSFC) under Grant 61531016, supported by Sichuan Provincial Science and Technology Important Projects under Grant 2018GZ0139, 2018ZDZX0148 and 2018GZDZX0001. The work of H. Heidari was supported by the Glasgow Knowledge Exchange Fund 2017/18 at the University of Glasgow, U.K.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Heidari, Professor Hadi
• Authors: Cen, Y., Feng, W., Yang, P., Fan, H., Li, Y., Niu, Y., Liao, Z., Qi, X., Wang, B., Ran, Y., Li, W., Feng, Q., and Heidari, H.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: IEEE Access
• Publisher: IEEE
• ISSN: 2169-3536
• ISSN (Online): 2169-3536
• Published Online: 18 September 2020
• Copyright Holders: Copyright © 2020 IEEE
• First Published: First published in IEEE Access 8: 175230-175243
• Publisher Policy: Reproduced under a Creative Commons License