RT Journal Article
T1 Wide range calibration method for direct interface circuits and application to resistive force sensors
A1 Hidalgo-López, José Antonio
A1 Oballe-Peinado, Óscar
A1 Castellanos-Ramos, Julián
A1 Tejero-Calado, Juan Carlos
A1 Vidal-Verdú, Fernando
K1 Detectores
AB A novel approach to interface resistive sensors directly to a Field Programmable Gate Array (FPGA) is presented in this paper. The circuit is based on Direct Interface Circuits (DICs), which make the sensor reading through a magnitude-to-time-to-digital conversion using just a few passive elements and a programmable digital device. Specifically, the system uses two calibration resistors of known value, two capacitors, and a new equation to estimate the sensor resistance in order to obtain an improved estimation in both the high and low parts of the resistance range. Furthermore, the new method can be used for reading resistive force sensors, with the advantage that the equations can be adapted for the output to directly provide the force exerted, thus avoiding the need for a resistance-to- force conversion. The circuit has been implemented using an FPGA as the programmable digital device to characterize the system, which allows both the reading of discrete resistors and those of a commercial force sensor. When discrete resistors are measured, estimation error in the low part of the range (a few hundred ohms) is reduced between twofold and fivefold compared to the results provided by other DICs. Moreover, the most significant errors produced by the new method when reading a force sensor come in the high part of the range (several tens of Newtons), standing at just 0.88%, compared to errors between 1.94% and 5.23% of other methods proposed in the literature.
PB Institute of Electrical and Electronics Engineers
YR 2021
FD 2021-10-15
LK https://hdl.handle.net/10630/36261
UL https://hdl.handle.net/10630/36261
LA eng
NO J. A. Hidalgo-López, Ó. Oballe-Peinado, J. Castellanos-Ramos, J. C. Tejero-Calado and F. Vidal-Verdú, "Wide Range Calibration Method for Direct Interface Circuits and Application to Resistive Force Sensors," in IEEE Sensors Journal, vol. 21, no. 20, pp. 22956-22966, 15 Oct.15, 2021, doi: 10.1109/JSEN.2021.3107589.
NO This work was supported 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 12 abr 2026