RT Journal Article
T1 Two-Capacitor Direct Interface Circuit for Resistive Sensor Measurements
A1 Hidalgo-López, José A.
A1 Oballe-Peinado, Óscar
A1 Castellanos-Ramos, Julián
A1 Sánchez-Durán, José A.
K1 Direct interface circuits
K1 Interface sensor
K1 Resistive sensor
K1 Time-based measurement
K1 Calibration methods
K1 Uncertainty
K1 Incertidumbre
K1 Redes neurales de la computación
K1 Computadoras de mano
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 http://hdl.handle.net/10668/3771
UL http://hdl.handle.net/10668/3771
LA en
NO Hidalgo-López JA, Oballe-Peinado Ó, Castellanos-Ramos J, Sánchez-Durán JA. Two-Capacitor Direct Interface Circuit for Resistive Sensor Measurements. Sensors. 2021 Feb 22;21(4):1524
DS RISalud
RD Apr 7, 2025