Design and Validation of a Wearable “DRL-less” EEG using a Novel Fully-Reconfigurable Architecture

Ruhi Mahajan, Bashir I. Morshed, Gavin M. Bidelman

Research output: Contribution to conferencePaper

5 Citations (Scopus)

Abstract

The conventional EEG system consists of a driven-right-leg (DRL) circuit, which prohibits modularization of the system. We propose a Lego-like connectable fully reconfigurable architecture of wearable EEG that can be easily customized and deployed at naturalistic settings for collecting neurological data. We have designed a novel Analog Front End (AFE) that eliminates the need for DRL while maintaining a comparable signal quality of EEG. We have prototyped this AFE for a single channel EEG, referred to as Smart Sensing Node (SSN), that senses brain signals and sends it to a Command Control Node (CCN) via an I2C bus. The AFE of each SSN (referential-montage) consists of an off-the-shelf instrumentation amplifier (gain=26), an active notch filter fc = 60Hz), 2nd-order active Butterworth low-pass filter followed by a passive low pass filter (fc = 47.5 Hz, gain = 1.61) and a passive high pass filter fc = 0.16 Hz, gain = 0.83). The filtered signals are digitized using a low-power microcontroller (MSP430F5528) with a 12-bit ADC at 512 sps, and transmitted to the CCN every 1 s at a bus rate of 100 kbps. The CCN can further transmit this data wirelessly using Bluetooth to the paired computer at a baud rate of 115.2 kbps. We have compared temporal and frequency-domain EEG signals of our system with a research-grade EEG. Results show that the proposed reconfigurable EEG captures comparable signals, and is thus promising for practical routine neurological monitoring in non-clinical settings where a flexible number of EEG channels are needed.
Original languageEnglish (US)
Pages4999-5002
Number of pages4
StatePublished - Aug 16 2016

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Reconfigurable architectures
Electroencephalography
Passive filters
Low pass filters
Butterworth filters
High pass filters
Notch filters
Active filters
Bluetooth
Microcontrollers
Brain
Networks (circuits)
Monitoring

Cite this

Design and Validation of a Wearable “DRL-less” EEG using a Novel Fully-Reconfigurable Architecture. / Mahajan, Ruhi; Morshed, Bashir I.; Bidelman, Gavin M. .

2016. 4999-5002.

Research output: Contribution to conferencePaper

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