A 5 μw/channel 9b-ENOB BioADC array for electrocortical recording

Elliot Greenwald, Ernest So, Mohsen Mollazadeh, Christoph Maier, Ralph Etienne-Cummings, Nitish Thakor, Gert Cauwenberghs

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We present a 4-channel integrated biopotential analog-To-digital converter (bioADC) for electrocortical recording in 180nm CMOS. The bioADC directly transduces microvolt biopotentials into a digital representation without a voltage-Amplification stage. Each channel comprises a continuous-Time first-order ΔΣ modulator with OTA input and current feedback, followed by a second-order comb-filter decimator. Powered from a 1.5V supply, the analog and digital circuits in each channel draw 2.1uA and 1.4uA of supply current, respectively. The bioADCs achieve an SNR of 57dB and a SFDR or 63.5dB, for 9-b ENOB. Intracranial EEG recordings from an anesthetized rat are shown and compared to simultaneous recordings from a commercial reference system to validate performance in-vivo. The micropower operation and direct digital readout make this circuit ideally suited for closed-loop neuromodulation applications.

Original languageEnglish (US)
Title of host publicationIEEE Biomedical Circuits and Systems Conference
Subtitle of host publicationEngineering for Healthy Minds and Able Bodies, BioCAS 2015 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479972333
DOIs
StatePublished - Dec 4 2015
Event11th IEEE Biomedical Circuits and Systems Conference, BioCAS 2015 - Atlanta, United States
Duration: Oct 22 2015Oct 24 2015

Publication series

NameIEEE Biomedical Circuits and Systems Conference: Engineering for Healthy Minds and Able Bodies, BioCAS 2015 - Proceedings

Other

Other11th IEEE Biomedical Circuits and Systems Conference, BioCAS 2015
CountryUnited States
CityAtlanta
Period10/22/1510/24/15

ASJC Scopus subject areas

  • Biotechnology
  • Instrumentation
  • Biomedical Engineering
  • Electrical and Electronic Engineering

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