Approaches to Quantify and Suppress Noise and Improve Signal Integrity in Wearable Wireless Biosignal Systems

This paper is intended to help provide an introduction for EMC analysis, design and signal integrity assurance for wearable wireless biosignal sensors. First, a mechanism by which external electromagnetic field couple to the biosignal sensor circuit is explained in terms of common-mode to differential-mode conversion. Based on this, some noise quantification and suppression techniques for biosignal sensors are introduced. Next, focusing on reducing inter-symbol interference in wideband communications from the surface to the inside of the human body, a pre-emphasis technique which guarantee a balance between signal integrity improvement and signal-to-noise power degradation is proposed and proved useful.