Integrated Circuits and Systems >

2024 , Vol. 1 >Issue 4: 239 - 246

DOI: https://doi.org/10.23919/ICS.2024.3513261

Original article

A Multi-Channel 133-dB DR PPG/ECG SoC for Smart Wearable Devices

  • SHIHONG ZHOU 1, 2 ,
  • XIN WANG 1 ,
  • YANXING SUO 1 ,
  • XIAO HAN 1 ,
  • GUOXING WANG 1, 2 ,
  • YANG ZHAO , 1
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  • 1 Department of Micro-Nano Electronics, Shanghai Jiao Tong University, Shanghai 200240, China
  • 2 National Key Laboratory of Advanced Micro and Nano Manufacture Technology, Shanghai 200240, China
+ CORRESPONDING AUTHOR: YANG ZHAO (e-mail: ).

Received date: 2024-11-10

  Revised date: 2024-11-28

  Accepted date: 2024-12-03

  Online published: 2025-01-09

Supported by

the National Key Research and Development Program of China(2022YFB4400800)

the Natural Science Foundation of China under Grant(62434006)

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Abstract

Real-time monitoring of multimodal vital signs including electrocardiography (ECG) and photoplethysmography (PPG) on wearable devices are attracting increasing interests. Motion artifacts, ambient light interference and sensor-skin contact variability affect signal quality significantly, demanding a multi-channel sensor interface chip with high dynamic range yet low power. A PPG/ECG interface chip is proposed for robust signal optimization. Time-division multiplexing, ambient double sampling and DC current compensation together enhance the dynamic range. Fabricated in a 0.18 μm process, the chip features a 5.63-pArms direct digitized input-referred noise for PPG readout and 365-nVrms for ECG. A cross-scale dynamic range of 133 dB is achieved, providing saturation-free usage for sport wearable devices such as smart watches and rings.

Key words： Electrocardiography; high dynamic range; multimodal sensors; photoplethysmography.

Cite this article

SHIHONG ZHOU , XIN WANG , YANXING SUO , XIAO HAN , GUOXING WANG , YANG ZHAO . A Multi-Channel 133-dB DR PPG/ECG SoC for Smart Wearable Devices[J]. Integrated Circuits and Systems, 2024 , 1(4) : 239 -246 . DOI: 10.23919/ICS.2024.3513261

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