NDLI: NeuroMonitor: a low-power, wireless, wearable EEG device with DRL-less AFE

Content Provider	IET Digital Library
Author	Pacareu, Sergi Consul Mahajan, Ruhi Saude, Mohammad J. Abu Morshed, Bashir I.
Abstract	Electroencephalography (EEG) is an effective tool to non-invasively capture brain responses. Traditional EEG analogue front end (AFE) requires a driven right leg (DRL) circuit that restricts the number of channels of the device. The authors are proposing a new ‘DRL-less’ AFE design, and have developed a wearable EEG device (NeuroMonitor), which is small, low-power, wireless, and battery operated. The EEG device with two independent channels was fabricated on an 11.35 cm2 PCB that contained a system-on-a-chip microcontroller, a low-noise instrument amplifier, a low-power Bluetooth module, a microSD, a microUSB, and a LiPo battery. The DRL circuit was eliminated by utilising the high CMRR instrument amplifier with differential inputs, and followed by a modified high-Q active Twin-T notch filter ((fc Notch = 60 Hz, − 38 dB). The signal was conditioned with a band-pass filter composed of a two-stage 2nd-order Chebyshev-I Sallen-Key low-pass filter cascaded with a passive 2nd-order low-pass filter (fc LP = 125 Hz) and a 1st-order passive high-pass filter (fc HP = 0.5 Hz). Finally, the signal was amplified to achieve an overall gain of 55.84 dB, and digitised with a 16-bit delta-sigma ADC (256 sps). The prototype weighs 41.8 gm, and has been validated against a research-grade EEG system (Neuroscan).
Starting Page	471
Ending Page	477
Page Count	7
ISSN	1751858X
Volume Number	11
e-ISSN	17518598
Issue Number	Issue 5, Sep (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-cds/11/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-cds.2016.0256
Journal	IET Circuits, Devices & Systems
Publisher Date	2017-03-16
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	1st-order Passive High-pass Filter AFE Amplifiers Analogue MUX Band-pass Filter Battery Bioelectric Signal Biomedical Electronics Bipolar Montage Bluetooth Cyber Physical System Data Streaming Delta-sigma ADC Driven Right Leg Circuit DRL Circuit DRL-less AFE Design EEG Analogue Front-end EEG Data Collection Electrodiagnostics And Other Electrical Measurement Technique Electroencephalography Four-layer PCB Frequency 125 Hz Frequency 60 Hz Frequency Domain Frequency Domain Analysis Gain 55.84 DB High Pass Filter Instrumentation Amplifiers Interactive Brain Computer Interface Low Noise Amplifier Low Power Electronics Low-noise High CMRR Instrument Amplifier Low-power Wireless Module Low-power Wireless Wearable EEG Device MicroUSB Port Mid-rail Biasing Modified High-Q Active Twin-T Notch Filter Mutex Dual-buffer NeuroMonitor Prototype Notch Filter On-board Analysis Passive 2nd-order Low-pass Filter Passive Filter Passive Network Printed Circuit Programmable System-on-a-chip Microcontroller PSoC Microcontroller Referential Montage Research-grade EEG System Time Domain Time Domain Analysis Two Stage 2nd-order Chebyshev-I Sallen-key Low-pass Filter Word Length 16 Bit
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
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