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A 0.016² 12b ΔΣSAR With 14fJ/conv. for ultra low power biosensor arrays

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Title: A 0.016² 12b ΔΣSAR With 14fJ/conv. for ultra low power biosensor arrays
Authors: Leene, L
Constandinou, TG
Item Type: Journal Article
Abstract: The instrumentation systems for implantable brain-machine interfaces represent one of the most demanding applications for ultra low-power analogue-to-digital-converters (ADC) to date. To address this challenge, this paper proposes a ΔΣSAR topology for very large sensor arrays that allows an exceptional reduction in silicon footprint by using a continuous time 0-2 MASH topology. This configuration uses a specialized FIR window to decimate the ΔΣ modulator output and reject mismatch errors from the SAR quantizer, which mitigates the overhead from dynamic element matching techniques commonly used to achieve high precision. A fully differential prototype was fabricated using 0.18 μm CMOS to demonstrate 10.8 ENOB precision with a 0.016 mm² silicon footprint. Moreover, a 14 fJ/conv figure-of-merit can be achieved, while resolving signals with the maximum input amplitude of ±1.2,Vpp sampled at 200 kS/s. The ADC topology exhibits a number of promising characteristics for both high speed and ultra low-power systems due to the reduced complexity, switching noise, sampling load, and oversampling ratio, which are critical parameters for many sensor applications.
Issue Date: 15-Jun-2017
Date of Acceptance: 6-May-2017
URI: http://hdl.handle.net/10044/1/49319
DOI: https://dx.doi.org/10.1109/TCSI.2017.2703580
ISSN: 1549-8328
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Start Page: 2655
End Page: 2665
Journal / Book Title: IEEE Transactions on Circuits and Systems. Part 1: Regular Papers
Volume: 64
Issue: 10
Copyright Statement: © 2017 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.See http://www.ieee.org/publications_standards/publications/rights/index.html for more information.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/K015060/1
Keywords: 0906 Electrical And Electronic Engineering
Electrical & Electronic Engineering
Publication Status: Published
Open Access location: http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7949142
Appears in Collections:Electrical and Electronic Engineering
Faculty of Engineering