A Low-Power High-Sensitivity Photocurrent Sensory Circuit with Capacitive Feedback Transimpedance for Photoplethysmography Sensing

This study presents an integrated analog front-end (AFE) tailored for photoplethysmography (PPG) sensing. The AFE module introduces a novel transimpedance amplifier (TIA) that incorporates capacitive feedback techniques alongside common drain feedback (CDF) TIA. The unique TIA topology achieves both...

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Bibliographic Details
Published inSensors (Basel, Switzerland) Vol. 24; no. 13; p. 4097
Main Authors Mohan, Neethu, Awwad, Falah, Albastaki, Nabil, Atef, Mohamed
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 24.06.2024
Subjects
automatic light control
Bandwidths
Blood pressure
Design
Feedback
Heart rate
Light emitting diodes
optical receiver
Oxygen saturation
PPG sensor
transimpedance amplifier
transimpedance amplifier
PPG sensor
automatic light control
optical receiver
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Summary:This study presents an integrated analog front-end (AFE) tailored for photoplethysmography (PPG) sensing. The AFE module introduces a novel transimpedance amplifier (TIA) that incorporates capacitive feedback techniques alongside common drain feedback (CDF) TIA. The unique TIA topology achieves both high gain and high sensitivity while maintaining low power consumption. The resultant PPG sensor module demonstrates impressive specifications, including an input noise current of 4.81 pA/sqrt Hz, a transimpedance gain of 18.43 MΩ, and a power consumption of 68 µW. Furthermore, the sensory system integrates an LED driver featuring automatic light control (ALC), which dynamically adjusts the LED power based on the strength of the received signal. Employing 0.35 µm CMOS technology, the AFE implementation occupies a compact footprint of 1.98 mm × 2.475 mm.
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ISSN:1424-8220
1424-8220
DOI:10.3390/s24134097