Measuring Dynamic Signals with Direct Sensor-to-Microcontroller Interfaces Applied to a Magnetoresistive Sensor

Sensors
Ernesto SifuentesFerran Reverter

Abstract

This paper evaluates the performance of direct interface circuits (DIC), where the sensor is directly connected to a microcontroller, when a resistive sensor subjected to dynamic changes is measured. The theoretical analysis provides guidelines for the selection of the components taking into account both the desired resolution and the bandwidth of the input signal. Such an analysis reveals that there is a trade-off between the sampling frequency and the resolution of the measurement, and this depends on the selected value of the capacitor that forms the RC circuit together with the sensor resistance. This performance is then experimentally proved with a DIC measuring a magnetoresistive sensor exposed to a magnetic field of different frequencies, amplitudes, and waveforms. A sinusoidal magnetic field up to 1 kHz can be monitored with a resolution of eight bits and a sampling frequency of around 10 kSa/s. If a higher resolution is desired, the sampling frequency has to be lower, thus limiting the bandwidth of the dynamic signal under measurement. The DIC is also applied to measure an electrocardiogram-type signal and its QRS complex is well identified, which enables the estimation, for instance, of the heart rate.

References

Dec 24, 2015·Sensors·Óscar Oballe-PeinadoJosé A Hidalgo-López
Feb 4, 2016·Sensors·Óscar Oballe-PeinadoJosé A Hidalgo-López

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Citations

Feb 13, 2019·Sensors·Ernesto SifuentesFerran Reverter
Oct 3, 2019·Micromachines·Jesús A Botín-CórdobaJosé A Hidalgo-López
Sep 11, 2019·Sensors·José A Hidalgo-LópezÓscar Oballe-Peinado
May 7, 2020·Sensors·José A Hidalgo-LópezÓscar Oballe-Peinado
Mar 7, 2021·Sensors·José A Hidalgo-LópezJosé A Sánchez-Durán

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BETA
chip

Software Mentioned

LabVIEW

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