Publication

VCO-CARE: VCO-based Calibration-free Analog Readout for Electrodermal activity sensing

2025

Abstract

Continuous monitoring of electrodermal activity (EDA) through wearable devices has attracted much attention in recent times. However, the persistent challenge demands analog front-end (AFE) systems with high sensitivity, low power consumption, and minimal calibration requirements to ensure practical usability in wearable technologies. In response to this challenge, this research introduces VCO-CARE, a VoltageControlled Oscillator-based Analog Readout tailored for continuous EDA sensing. The results show that our system achieves an exceptional average sensitivity of up to 40 pS within a 0−20μS range and a negligible relative error of less than 0.0025% for fixed-resistance. Furthermore, the proposed system consumes only an average of 2.3μ W based on post-layout validations and introduces a low noise contribution, measuring only 0.8μ Vrms across the 0−1.5 Hz EDA signal band. This research aims to drive the evolution of wearable sensors characterized by seamless adaptability to diverse users, minimal power consumption, and outstanding noise resilience.

Official source

https://infoscience.epfl.ch/entities/publication/304502f1-13e3-4a49-81bd-de6cfa3a7649

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2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/304502f1-13e3-4a49-81bd-de6cfa3a7649

About this result

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VCO-CARE: VCO-based Calibration-free Analog Readout for Electrodermal activity sensing

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