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Sensors 2016, 16(2), 181; doi:10.3390/s16020181

Accuracy and Resolution Analysis of a Direct Resistive Sensor Array to FPGA Interface

1
Departamento de Electrónica, Universidad de Málaga, Andalucía Tech, Campus de Teatinos, Málaga 29071, Spain
2
Instituto de Investigación Biomédica de Málaga (IBIMA), Málaga 29010, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Gonzalo Pajares Martinsanz
Received: 27 December 2015 / Revised: 27 January 2016 / Accepted: 29 January 2016 / Published: 1 February 2016
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain 2015)
View Full-Text   |   Download PDF [2858 KB, uploaded 1 February 2016]   |  

Abstract

Resistive sensor arrays are formed by a large number of individual sensors which are distributed in different ways. This paper proposes a direct connection between an FPGA and a resistive array distributed in M rows and N columns, without the need of analog-to-digital converters to obtain resistance values in the sensor and where the conditioning circuit is reduced to the use of a capacitor in each of the columns of the matrix. The circuit allows parallel measurements of the N resistors which form each of the rows of the array, eliminating the resistive crosstalk which is typical of these circuits. This is achieved by an addressing technique which does not require external elements to the FPGA. Although the typical resistive crosstalk between resistors which are measured simultaneously is eliminated, other elements that have an impact on the measurement of discharge times appear in the proposed architecture and, therefore, affect the uncertainty in resistance value measurements; these elements need to be studied. Finally, the performance of different calibration techniques is assessed experimentally on a discrete resistor array, obtaining for a new model of calibration, a maximum relative error of 0.066% in a range of resistor values which correspond to a tactile sensor. View Full-Text
Keywords: resistive sensor arrays; direct sensor-to-digital device interface; FPGAs; parallel analogue data acquisition resistive sensor arrays; direct sensor-to-digital device interface; FPGAs; parallel analogue data acquisition
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MDPI and ACS Style

Oballe-Peinado, Ó.; Vidal-Verdú, F.; Sánchez-Durán, J.A.; Castellanos-Ramos, J.; Hidalgo-López, J.A. Accuracy and Resolution Analysis of a Direct Resistive Sensor Array to FPGA Interface. Sensors 2016, 16, 181.

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