Abstract
This study presents a novel approach of measuring quantity of melanin skin in a noninvasive way using Photoplethysmography (PPG). PPG sensors are widely used in noninvasive diagnosis and highly related to human skin and cardiovascular system health. In this study, a low power, low noise circuit which is able to evaluate skin melanin content and blood pressure simultaneously is successfully designed. The whole system is implemented as a system on chip (SOC) and fabricated by TSMC 0.18μm integrated circuit process. The performance of circuit is low power consumptions and high measurement accuracy. The error between simulation and measurement result is less than 3% while power consumption is as low as 1.5 mW.
