EEG acquisition system based on active electrodes with common-mode interference suppression by Driving Right Leg circuit

摘要: We present a system for the acquisition of EEG signals based on active electrodes and implementing Driving Right Leg circuit (DgRL). DgRL allows single-ended amplification analog-to-digital conversion, still guaranteeing common mode rejection in excess 110 dB. This to acquire high-quality essentially removing network interference both wet dry-contact electrodes. The front-end stage is integrated electrode, minimizing system's sensitivity electrode contact quality, cable movement interference. A/D conversion can be either remote back-end or placed head as well, allowing an all-digital communication back-end. Noise band from 0.5 100 Hz comprised between 0.62 1.3 µV, depending configuration. Current consumption one channel 390 µA. Thanks its low noise, high level suppression quick setup capabilities, particularly suitable use outside clinical environments, such home care, brain-computer interfaces consumer-oriented applications.