2026-05-28T19:44:21Zhttps://riuma.uma.es/rest/oai/requestoai:riuma.uma.es:10630/286212026-02-03T11:34:49Zcom_10630_2254col_10630_37953
RIUMA. Repositorio Institucional de la Universidad de Málaga
author
Hidalgo-López, José Antonio
2024-01-11T08:03:04Z
2024-01-11T08:03:04Z
2023-11-21
Hidalgo-López, J. A. "A Simple Front-End for Pulse Oximeters With a Direct Light-to-Time-to-Digital Interface Circuit," in IEEE Sensors Journal, vol. 24, no. 1, pp. 346-354, 1 Jan.1, 2024, doi: 10.1109/JSEN.2023.3333055.
https://hdl.handle.net/10630/28621
10.1109/JSEN.2023.3333055
Pulse oximeters are electronic devices that pro-
vide the values of two physiological parameters: heart rate
(HR) and functional O2 saturation, SpO2. Acquiring this infor-
mation requires a photodiode and a set of red and infrared
light-emitting diodes (LEDs) to generate two plethysmo-
grams, which are digitally processed to find the HR and SpO2
values. The circuits currently used to generate these plethys-
mograms require multiple analog modules, such as voltage
references, transimpedance amplifiers (TIAs), voltage ampli-
fiers, and comparators. Analog-to-digital converters (ADCs)
or switched integrators (SIs) are also needed to digitalize the
signals that provide the HR and SpO2 values when introduced
in a digital processor (DP). This article proposes a new circuit
that eliminates the need for all these analog modules or
converters, replacing them with a single capacitor and two
resistors. The circuit is based on a light-to-time-to-digital
conversion performed using the DP, which does not require
any special characteristics to carry out this task. As a proof
of concept, the new design has been implemented using a
field-programmable gate array (FPGA) as the DP. The results
show plethysmograms with good detail regarding amplitude
and time, allowing the device to be used for clinical purposes. A comparison with two conventional commercial pulse
oximeters shows that the new circuit provides similar HR and SpO2 values.
eng
Atribución 4.0 Internacional
Electrónica
Electrónica médica
Electrónica - Aparatos e instrumentos
A Simple front-end for pulse oximeters with a direct light-to-time-to-iigital interface circuit
journal article
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