RT Journal Article
T1 Two-capacitor direct interface circuit for resistive sensor measurements
A1 Hidalgo-López, José Antonio
A1 Oballe-Peinado, Óscar
A1 Castellanos-Ramos, Julián
A1 Sánchez-Durán, José Antonio
K1 Detectores
K1 Circuitos de interfaces
AB Direct interface circuits (DICs) avoid the need for signal conditioning circuits and analog- to-digital converters (ADCs) to obtain digital measurements of resistive sensors using only a few passive elements. However, such simple hardware can lead to quantization errors when measuring small resistance values as well as high measurement times and uncertainties for high resistances.Different solutions to some of these problems have been presented in the literature over recent years, although the increased uncertainty in measurements at higher resistance values is a problem that has remained unaddressed. This article presents an economical hardware solution that only requires an extra capacitor to reduce this problem. The circuit is implemented with a field-programmable gate array (FPGA) as a programmable digital device. The new proposal significantly reduces the uncertainty in the time measurements. As a result, the high resistance errors decreased by up to 90%.The circuit requires three capacitor discharge cycles, as is needed in a classic DIC. Therefore, the time to estimate resistance increases slightly, between 2.7% and 4.6%.
PB MDPI
YR 2021
FD 2021-02-22
LK https://hdl.handle.net/10630/36133
UL https://hdl.handle.net/10630/36133
LA eng
NO Hidalgo-López, J. A., Oballe-Peinado, Ó., Castellanos-Ramos, J., & Sánchez-Durán, J. A. (2021). Two-Capacitor Direct Interface Circuit for Resistive Sensor Measurements. Sensors, 21(4), 1524. https://doi.org/10.3390/s21041524
NO This work was funded by the Spanish Government and by the European ERDF program funds under contract TEC2015-67642-R.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026