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.
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 I^{2} C 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.
Xu et al. (Fri,) reported a other. 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.