85 dB dynamic range 1.2 mW 156 kS/s biopotential recording IC for high-density ECoG flexible active electrode array

Sohmyung Ha, Jongkil Park, Yu M. Chi, Jonathan Viventi, John A Rogers, Gert Cauwenberghs

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

Abstract

We present the design, implementation, and experimental characterization of a low-noise low-power biopotential recording integrated circuit (IC) in support of a fully implantable, high-density, actively multiplexed and flexible 32×32 electrode array for electrocorticography (ECoG) neural recording. Each ECoG recording IC contains an 8-channel ADC, each serving one column and multiplexing up to 32 rows in the external ECoG array. Each column ADC converts signal coarsely by 10-bit successive approximation (SA), and performs fine conversion of the residue by 7-bit 1st order incremental delta-sigma (ΔΣ) conversion. One bit of overlap between SA and ΔΣ stages supports wide dynamic range with an instantaneous core range of 3.9 mV, sufficiently larger than typical ECoG signals, while handling electrochemical and process variations in the ECoG electrode array up to ±1 V. Tests show a measured dynamic range of 85 dB and CMRR of 87 dB at 19.5 kS/s and at 19.4 μA from 3.3 V per ADC channel. The 8-channel IC occupies 18 mm2 in 0.6 μm 2P3M CMOS.

Original languageEnglish (US)
Title of host publicationESSCIRC 2013 - Proceedings of the 39th European Solid-State Circuits Conference
Pages141-144
Number of pages4
DOIs
StatePublished - Dec 31 2013
Event39th European Solid-State Circuits Conference, ESSCIRC 2013 - Bucharest, Romania
Duration: Sep 16 2013Sep 20 2013

Publication series

NameEuropean Solid-State Circuits Conference
ISSN (Print)1930-8833

Conference

Conference39th European Solid-State Circuits Conference, ESSCIRC 2013
CountryRomania
CityBucharest
Period9/16/139/20/13

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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    Ha, S., Park, J., Chi, Y. M., Viventi, J., Rogers, J. A., & Cauwenberghs, G. (2013). 85 dB dynamic range 1.2 mW 156 kS/s biopotential recording IC for high-density ECoG flexible active electrode array. In ESSCIRC 2013 - Proceedings of the 39th European Solid-State Circuits Conference (pp. 141-144). [6649092] (European Solid-State Circuits Conference). https://doi.org/10.1109/ESSCIRC.2013.6649092