Power Line Noise Reduction for Bio-Sensing Applications Using N-Path Notch Filter

Nicodimus RETDIAN
Takeshi SHIMA

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E100-A    No.2    pp.541-544
Publication Date: 2017/02/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E100.A.541
Type of Manuscript: Special Section LETTER (Special Section on Analog Circuit Techniques and Related Topics)
EEG,  power line noise,  N-path filter,  notch filter,  

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Power line noise is one of critical problems in bio-sensing. Various approaches utilizing both analog and digital techniques has been proposed. However, these approaches need active circuits with a wide dynamic range. N-path notch filters which implementable using passive components can be a promising solution to this problem. However, the notch depth of a conventional N-path notch filter is limited by the number of path. A new N-path notch filter with additional S/H circuit is proposed. Simulation results show that the proposed topology improves the notch depth by 43dB.