A 0.5V <4μW CMOS Photoplethysmographic Heart-Rate Sensor IC Based on a Non-Uniform Quantizer

📋 论文概要

本文提出了一种基于非均匀量化器的超低功耗CMOS光电容积描记法心率传感器IC，工作在0.5V电压下，功耗低于4μW。通过采用对数数字-电阻转换器作为光电二极管负载，并结合非均匀量化器，实现了低功耗的心率监测。

💡 主要创新点

• 采用非均匀量化器替代传统均匀量化器，显著降低系统功耗。
• 设计了对数数字-电阻转换器（DRC）作为光电二极管负载，优化了光信号处理。
• 实现了0.5V超低电压和<4μW超低功耗的心率传感IC，适用于连续健康监测。

🏷 关键词

📄 原文摘要

Now at Khalifa University, Abu Dhabi, United Arab Emirates 1 2 Photoplethysmographic biosensing has been of recent interest, since it provides electrode-free operation for continuous health-monitoring applications [1]. This paper presents a <4μW heart-rate (HR) monitor IC based on measurement of fluctuations in the light intensity passing through tissue such as a finger [2-4]. As shown in Fig. 22.3.1, key components of the system include a logarithmic, digital-to-resistance converter (DRC) that forms the load of an external photodiode, and a non-uniform quantizer that provides error information to a digital accumulator controlling the DRC input. As the photodiode current fluctuates due to HR-induced pulsing of bloodflow through the tissue, the feedback loop adjusts the DRC load resistance in order to maintain constant voltage across the photodiode. As such, the accumulator output, OUTADC[k], provides a digital representation of HR-induced fluctuations of the photodiode current, and the

👥 作者与机构

Mohammad Alhawari1,2, Nadya Albelooshi1, Michael H. Perrott1

Masdar Institute of Science and Technology, Abu Dhabi, United Arab Emirates,