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Conformable Wearable Electrodes: From Fabrication to Electrophysiological Assessment
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Active Electrodes for Wearable EEG Acquisition: Review and Electronics Design Methodology.
IEEE Reviews in Biomedical Engineering
|January 24, 2017
Summary
Active electrodes (AEs) improve wearable EEG systems by amplifying signals locally, reducing noise and motion artifacts. This enables comfortable dry electrodes for enhanced healthcare monitoring.
Area of Science:
- Biomedical Engineering
- Wearable Technology
- Neuroscience
Background:
- Active electrodes (AEs) offer robustness against environmental interference in wearable applications.
- AEs locally amplify and buffer microvolt-level EEG signals, mitigating cable motion artifacts.
- The use of high-impedance dry electrodes is enabled by AEs, improving user comfort.
Purpose of the Study:
- To review state-of-the-art bio-amplifier architectures for wearable EEG acquisition.
- To explore low-power analog circuit design techniques for wearable EEG systems.
- To focus on Active Electrode (AE) systems interfaced with dry electrodes for enhanced EEG monitoring.
Main Methods:
- Review of current bio-amplifier architectures.
- Analysis of low-power analog circuit design techniques.
- Focus on Active Electrode (AE) system integration with dry electrodes.
Main Results:
- Active electrodes (AEs) enhance signal quality by local amplification and buffering.
- Low output impedance of AEs reduces cable motion artifacts.
- Development of wearable EEG systems with medical-grade signal quality remains challenging.
Conclusions:
- Active electrodes (AEs) are crucial for robust wearable EEG systems.
- Design considerations include noise, offset tolerance, CMRR, input impedance, and power dissipation.
- AEs interfaced with dry electrodes represent a promising direction for comfortable and high-quality EEG acquisition.
