1. Simple low-power demodulator for the measurement of basal and physiological changes of electrical bioimpedance
- Author
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Ernesto Serrano-Finetti, Gemma Hornero, Oscar Casas, Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, and Universitat Politècnica de Catalunya. ISI - Grup d'Instrumentació, Sensors i Interfícies
- Subjects
Amplitude demodulation ,Pulse rate ,Respiratory Rate ,Wearable technology ,Low-power ,Wearable sensors ,Enginyeria electrònica::Instrumentació i mesura [Àrees temàtiques de la UPC] ,Impedance (Electricity) ,Impedance sensor ,Dispositius portables - Abstract
Wearable sensors constitute a growing trend both as a research tool as well as an end-consumer products. In the physiological signal monitoring fields, the changing signals have a low bandwidth hence most sensing techniques are not powerhungry. Electrical bioimpedance is a non-obtrusive sensing technique and is an interesting choice as it can recover both breathing and pulse rate signals. However, it works at comparatively higher frequencies and usually need demodulation circuitry, meaning higher power consumption. In this work, we show an alternative technique to demodulate the impedance response that need very few components and whose power consumption can be tailored as needed. We show that, by using a 24-bit ADC, the respiration and pulse rate signals as well as the basal impedance are recovered from the demodulated signal and further digital band-pass filters that are easily implemented with currently available low-power microcontroller technology. Further, it constitutes a compact solution, as the sensor needs not to change location to measure these signals. Peer Reviewed Objectius de Desenvolupament Sostenible::3 - Salut i Benestar
- Published
- 2022