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Analyses of parasitic capacitance effects and flicker noise of the DAC capacitor array for high resolution SAR ADCs

Yue, Xicai; Kiely, Janice; McLeod, Chris

Analyses of parasitic capacitance effects and flicker noise of the DAC capacitor array for high resolution SAR ADCs Thumbnail


Authors

Alex Yue Alex.Yue@uwe.ac.uk
Senior Lecturer in Bioinstrumentation and Sensor Interfacing

Janice Kiely

Chris McLeod



Abstract

Copyright © 2018 Inderscience Enterprises Ltd. This paper analyses the effects of parasitic capacitances of unit capacitors on the accuracy and the noise performance of the DAC capacitor array in a SAR ADC, showing that thermal noise of the array decreases while gain error is introduced. The gain error is almost independent of the number of bits, but the dynamic range of the high resolution ADC is severely reduced due to the gain error. The post-layout parasitic capacitance analysis of a 10-bit poly-poly array shows a large difference between the top-plate and bottom-plate parasitic capacitances so that the gain error can be decreased by 152 times when top-plates are connected together as the output node of the array. The switching transistors’ flicker noise calculation for a 10-bit and an 18-bit SAR ADC shows that flicker noise can be safely ignored for 10-bit 1MSPS SAR, but should be considered for the higher resolution SAR ADCs.

Citation

Yue, X., Kiely, J., & McLeod, C. (2018). Analyses of parasitic capacitance effects and flicker noise of the DAC capacitor array for high resolution SAR ADCs. International Journal of Computer Applications in Technology, 58(4), 259-266. https://doi.org/10.1504/IJCAT.2018.095934

Journal Article Type Article
Acceptance Date Jul 24, 2017
Online Publication Date Nov 2, 2018
Publication Date Nov 30, 2018
Journal International Journal of Computer Applications in Technology
Print ISSN 0952-8091
Publisher Inderscience
Peer Reviewed Peer Reviewed
Volume 58
Issue 4
Pages 259-266
DOI https://doi.org/10.1504/IJCAT.2018.095934
Keywords successive approximation register (SAR) ADC, DAC capacitor array, parasitic capacitance, thermal noise, flicker noise
Public URL https://uwe-repository.worktribe.com/output/904155
Publisher URL http://dx.doi.org/10.1504/IJCAT.2018.095934
Additional Information Additional Information : This is the author's accepted manuscript. The final published version is available here: http://dx.doi.org/10.1504/IJCAT.2018.095934.

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