Key result
A 15-channel digital active electrode system achieved 60 nV/sqrt(Hz) input-referred noise, ±350 mV electrode-offset tolerance, and improved CMRR up to 102 dB.
The proposed 15-channel digital active electrode system provides high-performance biopotential signal acquisition with reduced system complexity, suitable for portable and wearable devices.
May enable compact wearable ECG systems; leaves open clinical validation in patients.
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 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">I^2 C</tex> </formula> 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 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">±</tex></formula> 350 mV electrode-offset tolerance. A common-mode feedforward scheme improves the CMRR of an AE pair from 40 dB to maximum 102 dB.
No takes yet. Share an insight, caveat, or question.
Xu et al. (2015) studied this question. Digital active electrode (DAE) system was evaluated on System performance (input-referred noise, electrode-offset tolerance, CMRR). A 15-channel digital active electrode system achieved 60 nV/sqrt(Hz) input-referred noise, ±350 mV electrode-offset tolerance, and improved CMRR up to 102 dB.
Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context: