2026-05-22T05:24:08Zhttps://repisalud.isciii.es/rest/oai/request

oai:repisalud.isciii.es:20.500.12105/182662024-11-28T15:02:23Zcom_20.500.12105_15322com_20.500.12105_2051col_20.500.12105_16927

00925njm 22002777a 4500 dc Hidalgo-López, José A. author Oballe-Peinado, Óscar author Castellanos-Ramos, Julián author Sánchez-Durán, José A. author 2021-02-22 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%. 10.3390/s21041524 1424-8220 Sensors http://hdl.handle.net/10668/3771 33671720 http://hdl.handle.net/20.500.12105/18266 Direct interface circuits Interface sensor Resistive sensor Time-based measurement Calibration methods Uncertainty Incertidumbre Redes neurales de la computación Computadoras de mano Two-Capacitor Direct Interface Circuit for Resistive Sensor Measurements