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A 0.006mm² 1.2μW analogue-to-time converter for asynchronous bio-sensors

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Title: A 0.006mm² 1.2μW analogue-to-time converter for asynchronous bio-sensors
Authors: Leene, L
Constandinou, TG
Item Type: Journal Article
Abstract: This work presents a low-power analogue-to-time converter (ATC) for integrated bio-sensors. The proposed circuit facilitates the direct conversion of electrode biopotential recordings into time-encoded digital pulses with high efficiency without prior signal amplification. This approach reduces the circuit complexity for multi-channel instrumentation systems and allows asynchronous digital control to maximise the potential power savings during sensor inactivity. A prototype fabricated using a 65nm CMOS technology is demonstrated with measured characteristics. Experimental results show an input-referred noise figure of 3.8μ Vrms for a 11kHz signal bandwidth while dissipating 1.2μ W from a 0.5V supply and occupying 60 ×80μ m² silicon area. This compact configuration is enabled by the proposed asynchronous readout that shapes the mismatch components arising from the multi-bit quantiser and the use of capacitive feedback.
Issue Date: 1-Sep-2018
Date of Acceptance: 17-Jun-2018
URI: http://hdl.handle.net/10044/1/61566
DOI: https://dx.doi.org/10.1109/JSSC.2018.2850918
ISSN: 0018-9200
Publisher: Institute of Electrical and Electronics Engineers
Start Page: 2604
End Page: 2613
Journal / Book Title: IEEE Journal of Solid-State Circuits
Volume: 53
Issue: 9
Copyright Statement: © 2018 The Author(s). This work is licensed under a Creative Commons Attribution 3.0 License. Formore information, see http://creativecommons.org/licenses/by/3.0
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/M020975/1
EP/K015060/1
Keywords: Science & Technology
Technology
Engineering, Electrical & Electronic
Engineering
Analog-to-time conversion
asynchronous
bio-sensor
delta-sigma
instrumentation
low noise
low voltage
PHASE-NOISE
ADC
AMPLIFIERS
FILTER
0906 Electrical and Electronic Engineering
Electrical & Electronic Engineering
Publication Status: Published
Online Publication Date: 2018-07-23
Appears in Collections:Faculty of Engineering
Electrical and Electronic Engineering



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