Low-Power High-Sensitivity Photoplethysmography Sensor for Wearable Health Monitoring System

Binghui Lin, Zhouchen Ma, Mohamed Atef, Liang Ying, Guoxing Wang

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

This article presents a Photoplethysmography (PPG) sensory system for continuous health monitoring. The PPG chip is fabricated using 0.35~μ {m} standard CMOS technology and occupies 2.3 mm × 1.7 mm. The average power consumption of the receiver analog front-end (AFE) is 50.75~μ {W} , the LED driver is power 29.3~μ {W}. The consumed power is dramatically reduced due to the using of both low duty cycle for LED lighting and automatic light control (ALC). The PPG sensor has a low input noise current of 41.3 pA and can reject a DC photocurrent up to 24~μ {A} because of the integrated background light cancelation (BLC) loop. 12-b SAR-ADC and Serial Peripheral Interface (SPI) are integrated for communication with MCU used for signal processing and results display. Readings of 9 subjects show mean absolute error (MAE) and standard deviation (SD) of 1.95±2.13 beats per minute (BPM), 6.00±4.18mmHg, and 6.13±3.93mmHg, for heart rate (HR), systolic blood pressure (SBP), and diastolic blood pressure (DBP), respectively.

Original languageEnglish
Article number9363172
Pages (from-to)16141-16151
Number of pages11
JournalIEEE Sensors Journal
Volume21
Issue number14
DOIs
Publication statusPublished - Jul 15 2021

Keywords

  • Biomedical electronics
  • LED driver
  • Photoplethysmography
  • analog front end
  • duty cycling
  • low-power
  • optical sensors
  • wearable sensors

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering

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