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Sensors 2016, 16(2), 149; doi:10.3390/s16020149

Improved Circuits with Capacitive Feedback for Readout Resistive Sensor Arrays

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: Wee Ser
Received: 18 December 2015 / Revised: 8 January 2016 / Accepted: 20 January 2016 / Published: 25 January 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [1379 KB, uploaded 25 January 2016]   |  

Abstract

One of the most suitable ways of distributing a resistive sensor array for reading is an array with M rows and N columns. This allows reduced wiring and a certain degree of parallelism in the implementation, although it also introduces crosstalk effects. Several types of circuits can carry out the analogue-digital conversion of this type of sensors. This article focuses on the use of operational amplifiers with capacitive feedback and FPGAs for this task. Specifically, modifications of a previously reported circuit are proposed to reduce the errors due to the non-idealities of the amplifiers and the I/O drivers of the FPGA. Moreover, calibration algorithms are derived from the analysis of the proposed circuitry to reduce the crosstalk error and improve the accuracy. Finally, the performances of the proposals is evaluated experimentally on an array of resistors and for different ranges. 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
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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. Improved Circuits with Capacitive Feedback for Readout Resistive Sensor Arrays. Sensors 2016, 16, 149.

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