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http://dx.doi.org/10.9723/jksiis.2013.18.5.015

Implementation of an analog front-end for electroencephalogram signal processing  

Kim, Min-Chul (하이 에어 코리아)
Shim, Jae Hoon (경북대학교 IT대학 전자공학부)
Publication Information
Journal of Korea Society of Industrial Information Systems / v.18, no.5, 2013 , pp. 15-18 More about this Journal
Abstract
This paper presents an analog front-end for electroencephalogram(EEG) signal processing. Since EEG signals are typically weak and located at very low frequencies, it is imperative to implement an amplifier with high gain, high common-mode rejection ratio(CMRR) and good noise immunity at very low frequencies. The analog front-end of this paper consists of a programmable-gain instrumentation amplifier and a band-pass filter. A frequency chopping technique is employed to remove the low-frequency noise. The circuits were fabricated in 0.18um CMOS technology and measurements showed that the analog front-end has the maximum gain of 60dB and >100dB CMRR over the programmable gain range.
Keywords
Instrumentation Amplifier; EEG; VGA;
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