A 15-Channel digital active electrode system for multi-parameter biopotential measurement

Jiawei Xu, Benjamin Büsze, Chris Van Hoof, Kofi A.A. Makinwa, Refet Firat Yazicioglu

Research output: Contribution to journalArticleScientificpeer-review

48 Citations (Scopus)
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Abstract

This paper presents a digital active electrode (DAE) system for multi-parameter biopotential signal acquisition in portable and wearable devices. It is built around an IC that performs analog signal processing and digitization with the help
of on-chip instrumentation amplifiers, a 12 bit ADC and a digital interface. Via a standard bus, up to 16 digital active electrodes (15-channels) can be connected to a commercially available microcontroller, thus significantly reducing system
complexity and cost. In addition, the DAE utilizes an innovative functionally DC-coupled amplifier to preserve input DC signal, while still achieving state-of-the-art performance: 60 nV/sqrt(Hz) input-referred noise and 350 mV electrode-offset tolerance. A common-mode feedforward scheme improves the CMRR of an
AE pair from 40 dB to maximum 102 dB.
Original languageEnglish
Pages (from-to)2090-2100
Number of pages11
JournalIEEE Journal of Solid State Circuits
Volume50
Issue number9
DOIs
Publication statusPublished - 2015

Keywords

  • Active electrode
  • biopotential measurement
  • digital interface
  • DC-coupled amplifier
  • common-mode feedforward (CMFF)

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