A 1mW Vitals Monitoring System for Asthmatic Patients based on Photoplethysmography

2019 IEEE Biomedical Circuits and Systems Conference (BioCAS) Pub Date : 2019-10-01 DOI:10.1109/BIOCAS.2019.8918724

Afsah Syed, Khadijah Khan, Aleena Ahmad, Muhammad Asad, Wala Saadeh

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引用次数: 10

Abstract

The number of patients suffering from asthma, especially in air-polluted regions, has dramatically risen. Thus, the need for a wearable system that is able to monitor the patient's condition is essential. Continuous heart rate (HR) and blood oxygen concentration (SpO2) measurements are crucial for asthmatic patients. This paper presents a low power, portable/wearable system to measure the HR, heart rate variability (HRV) and SpO2 based on Photoplethysmography. The analog front end (AFE) consists of a switched capacitor trans-impedance amplifier and switched capacitor low pass filter to realize a high gain (120dB) and low cut off frequency (10Hz) on-chip. The proposed AFE enables a photodiode input DC current up to 20µA with input-referred current noise of 7.3pA/√Hz. The system is implemented in 180nm CMOS with a die area of 2.6mm2 while consuming 1mW/2.3µW from a 0.5V supply for LED drivers and AFE, respectively. The HR/HRV/SpO2 extraction processor is implemented on FPGA. The maximum absolute error percentage in HR/SpO2 measurements from an experiment involving 21 subjects comes out to be <1%.

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基于光电容积脉搏波的1mW哮喘患者生命体征监测系统

哮喘患者的数量急剧上升，特别是在空气污染地区。因此，需要一种能够监测患者病情的可穿戴系统是必不可少的。连续的心率(HR)和血氧浓度(SpO2)测量对哮喘患者至关重要。本文提出了一种低功耗、便携式/可穿戴的基于光电容积脉搏波的心率、心率变异性(HRV)和SpO2测量系统。模拟前端(AFE)由开关电容反阻抗放大器和开关电容低通滤波器组成，实现片上高增益(120dB)和低截止频率(10Hz)。所提出的AFE使光电二极管输入直流电流高达20 μ a，输入参考电流噪声为7.3pA/√Hz。该系统采用180nm CMOS实现，芯片面积为2.6mm2, LED驱动器和AFE分别从0.5V电源消耗1mW/2.3µW。HR/HRV/SpO2提取处理器在FPGA上实现。在涉及21名受试者的实验中，HR/SpO2测量的最大绝对误差百分比<1%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 IEEE Biomedical Circuits and Systems Conference (BioCAS)

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