Publication result detail

Novel voltage Multiplier/Divider-based active square law detector for heartbeat measurement

ŠOTNER, R.; POLÁK, L.; JEŘÁBEK, J.; LANGHAMMER, L.; FREEBORN, T.

Original Title

Novel voltage Multiplier/Divider-based active square law detector for heartbeat measurement

English Title

Novel voltage Multiplier/Divider-based active square law detector for heartbeat measurement

Type

WoS Article

Original 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.

English 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.

Keywords

Analog multiplier; Beats per minute (BPM); Detector; Heart rate; Sensing readout; Schmitt comparator; Variable gain amplifier

Key words in English

Analog multiplier; Beats per minute (BPM); Detector; Heart rate; Sensing readout; Schmitt comparator; Variable gain amplifier

Authors

ŠOTNER, R.; POLÁK, L.; JEŘÁBEK, J.; LANGHAMMER, L.; FREEBORN, T.

RIV year

2025

Released

28.02.2024

Publisher

ELSEVIER SCI LTD

Location

London

ISBN

0263-2241

Periodical

MEASUREMENT

Volume

226

Number

2

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

12

Pages count

12

URL

https://www.sciencedirect.com/science/article/pii/S0263224124000290?via%3Dihub

Full text in the Digital Library

http://hdl.handle.net/11012/249344

BibTex

@article{BUT188348,
  author="Roman {Šotner} and Ladislav {Polák} and Jan {Jeřábek} and Lukáš {Langhammer} and Todd {Freeborn}",
  title="Novel voltage Multiplier/Divider-based active square law detector for heartbeat measurement",
  journal="MEASUREMENT",
  year="2024",
  volume="226",
  number="2",
  pages="1--12",
  doi="10.1016/j.measurement.2024.114145",
  issn="0263-2241",
  url="https://www.sciencedirect.com/science/article/pii/S0263224124000290?via%3Dihub"
}

Documents

1-s2.0-S0263224124000290-main
detector_BPM_v_knihovna
j.measurement.2024.114145_accepted