A Highly-Accurate Low-Power CMOS Potentiostat for Implantable BioSensors
2011 (English)In: Biomedical Circuits and Systems Conference (BioCAS), 2011 IEEE, 2011, 5-8 p.Conference paper (Refereed)
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.
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-59202DOI: 10.1109/BioCAS.2011.6107713ScopusID: 2-s2.0-84855671089ISBN: 978-1-4577-1469-6OAI: oai:DiVA.org:kth-59202DiVA: diva2:475366
IEEE Biomedical Circuits & Systems Comference (BioCAS), San Diego, CA, USA, 10-12 Nov, 2011
QC 201201112012-01-102012-01-102012-01-11Bibliographically approved