A 2.6µW Monolithic CMOS Photoplethysmographic Sensor Operating with 2µW LED Power

📋 论文概要

该论文提出了一种单芯片CMOS光电体积描记（PPG）传感器，总功耗仅2.6µW，其中LED驱动功率仅2µW，显著降低了传统PPG传感器中LED功耗占主导的问题。通过创新的低功耗架构和驱动技术，实现了用于心率和血氧饱和度监测的超低功耗传感。

💡 主要创新点

• 实现了总功耗2.6µW（LED仅2µW）的单芯片CMOS PPG传感器，大幅降低LED功耗瓶颈。
• 采用优化的低功耗驱动和采样技术，使LED功率从传统的数十mA降至2µW。

🏷 关键词

📄 原文摘要

Photoplethysmography (PPG) is a key technology allowing non-invasive monitoring of vital indicators such as heart rate (HR) and oxygen saturation (SpO2). Today, the total PPG sensor power consumption is dominated by the few tens of mA of the LEDs driving current. Different solutions have been proposed to solve this bottle-neck, either by reducing the LED duty cycle [1-2] or by nonuniform sub-sampling [3]. A heart-beat-locked loop system that significantly reduces the LED power has been recently demonstrated [4]. However, this power reduction comes at the cost of more complexity since it requires a non-trivial heart beat prediction scheme and intrinsically hinders the full PPG wave representation. In this work, we address the power issue by combining a high sensitivity photodetector with an ultra-low noise and low power readout chain achieving the same signal-to-noise ratio (SNR) compared to conventional solutions, but at

👥 作者与机构

Antonino Caizzone, Assim Boukhayma, Christian Enz

EPFL, Neuchâtel, Switzerland