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Title: A low power pre-setting based sub-radix-2 approximation for multi-bit/cycle SAR ADCs
Authors: Qiu, Lei
Wang, Keping
Yang, Chuanshi
Zheng, Yuanjin
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2020
Source: Qiu, L., Wang, K., Yang, C., & Zheng, Y. (2020). A low power pre-setting based sub-radix-2 approximation for multi-bit/cycle SAR ADCs. IEEE Access, 8, 83062-83069. doi:10.1109/access.2020.2991236
Journal: IEEE Access
Abstract: A pre-setting based sub-radix-2 approximation technique for multi-bit/cycle successive-approximation-register (SAR) analog to digital converters (ADCs) is proposed in this paper. The proposed approximation technique enhances the conversion speed and relieves the power hungry reference voltage buffer. The sub-radix-2 approximation only adjusts the weights of original binary DAC array without introducing additional unit capacitors and leading to reduced silicon area and power consumption. An adder based backend encoding circuit is proposed, with negligible power and silicon area overhead. Furthermore, the non-ideal DNL/INL, which are caused by incomplete DAC settling, are characterized and analysed in this paper. The peak DNL/INL values are symmetrically located at 1/4 and 3/4 of full scale. With the presence of sub-radix-2 approximation, the peak INL/DNL could be significantly reduced. The simulation results show the better performance of sub-radix-2 approximation than binary approximation. Designed in CMOS 40nm technology, it could keep a higher (>9.5-bit) effective number of bits (ENOB) with short settling time of DAC buffer, and boost the sampling rate equivalently.
ISSN: 2169-3536
DOI: 10.1109/ACCESS.2020.2991236
Rights: © 2020 IEEE. This journal is 100% open access, which means that all content is freely available without charge to users or their institutions. All articles accepted after 12 June 2019 are published under a CC BY 4.0 license, and the author retains copyright. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles, or use them for any other lawful purpose, as long as proper attribution is given.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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