Novel voltage Multiplier/Divider-based active square law detector for heartbeat measurement
No Thumbnail Available
Date
2024-02-28
Authors
Šotner, Roman
Polák, Ladislav
Jeřábek, Jan
Langhammer, Lukáš
Freeborn, Todd
0000-0002-2430-1815Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
ELSEVIER SCI LTD
Altmetrics
Abstract
This paper describes a novel active voltage detector that is capable of processing analog signals with levels from units of mV up to 250 mV. An advantage of the proposed circuit is that the relationship between output voltage and input level is not linear but quadratic, which increases the sensitivity when processing low-level signals. The presented solution has tuning parameters for correction or intentional shift of internal DC offset and electronic control of the output signal gain level. The application example presents detection of beats per minute (BPM) in the range of 6-300 BPM, which corresponds to a frequency range of 0.1-5 Hz. The advantage of the presented solution is that the output of the circuit is directly a digital signal compatible with TTL levels, so there is no need for any analog to digital converter to produce a digital signal for further processing.
Description
Citation
MEASUREMENT, Journal of the International Measurement Confederation (IMEKO)
. 2024, vol. 226, issue 2, p. 1-12.
https://www.sciencedirect.com/science/article/pii/S0263224124000290?via%3Dihub
https://www.sciencedirect.com/science/article/pii/S0263224124000290?via%3Dihub
Document type
Peer-reviewed
Document version
Accepted version
Date of access to the full text
2026-01-26
Language of document
en
Study field
Comittee
Date of acceptance
Defence
Result of defence
Document licence
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
http://creativecommons.org/licenses/by-nc-nd/4.0/