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A Highly-Accurate Low-Power CMOS Potentiostat for Implantable BioSensors
KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits. (Integrated Devices and Circuits)
Tech. Univ. of Catalunya.
KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.ORCID iD: 0000-0003-3802-7834
2011 (English)In: Biomedical Circuits and Systems Conference (BioCAS), 2011 IEEE, 2011, 5-8 p.Conference paper, Published paper (Refereed)
Abstract [en]

Current-mirror-based potentiostats suffer from sys-tematic and random errors causing offset, gain and linearityerror in reading out the sensor data. In this work, a newpotentiostat topology is proposed to eliminate the systematicerror via an error-cancellation loop. The loop takes advantageof an error-tracking amplifier connected to a transimpedanceamplifier with adjustable input common-mode voltage. Due tothe enhanced loop gain, the potentiostat is able to accuratelycopy the sensor current which will then be converted into theproportional voltage. Additionally, a theoretical discussion ofthe proposed topology is given and a thorough study on theeffect of random error sources is carried out. The potentiostat isdesigned and simulated in a 150nm CMOS process. The resultsverify a highly-linear highly-accurate performance in a low-noisecondition, while consuming only 32 μW.

Place, publisher, year, edition, pages
2011. 5-8 p.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-59202DOI: 10.1109/BioCAS.2011.6107713Scopus ID: 2-s2.0-84855671089ISBN: 978-1-4577-1469-6 (print)OAI: oai:DiVA.org:kth-59202DiVA: diva2:475366
Conference
IEEE Biomedical Circuits & Systems Comference (BioCAS), San Diego, CA, USA, 10-12 Nov, 2011
Note
QC 20120111Available from: 2012-01-10 Created: 2012-01-10 Last updated: 2012-01-11Bibliographically approved

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Rusu, Ana

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