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.
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 language | English |
|---|---|
| Pages (from-to) | 2090-2100 |
| Number of pages | 11 |
| Journal | IEEE Journal of Solid State Circuits |
| Volume | 50 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2015 |
Keywords
- Active electrode
- biopotential measurement
- digital interface
- DC-coupled amplifier
- common-mode feedforward (CMFF)