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Sensors 2016, 16(12), 2070; doi:10.3390/s16122070

An Improved Zero Potential Circuit for Readout of a Two-Dimensional Resistive Sensor Array

School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China
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Author to whom correspondence should be addressed.
Academic Editors: Pak Kwong Chan and Holden King-Ho Li
Received: 2 November 2016 / Revised: 24 November 2016 / Accepted: 1 December 2016 / Published: 6 December 2016
(This article belongs to the Special Issue Smart Sensor Interface Circuits and Systems)
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Abstract

With one operational amplifier (op-amp) in negative feedback, the traditional zero potential circuit could access one element in the two-dimensional (2-D) resistive sensor array with the shared row-column fashion but it suffered from the crosstalk problem for the non-scanned elements’ bypass currents, which were injected into array’s non-scanned electrodes from zero potential. Firstly, for suppressing the crosstalk problem, we designed a novel improved zero potential circuit with one more op-amp in negative feedback to sample the total bypass current and calculate the precision resistance of the element being tested (EBT) with it. The improved setting non-scanned-electrode zero potential circuit (S-NSE-ZPC) was given as an example for analyzing and verifying the performance of the improved zero potential circuit. Secondly, in the S-NSE-ZPC and the improved S-NSE-ZPC, the effects of different parameters of the resistive sensor arrays and their readout circuits on the EBT’s measurement accuracy were simulated with the NI Multisim 12. Thirdly, part features of the improved circuit were verified with the experiments of a prototype circuit. Followed, the results were discussed and the conclusions were given. The experiment results show that the improved circuit, though it requires one more op-amp, one more resistor and one more sampling channel, can access the EBT in the 2-D resistive sensor array more accurately. View Full-Text
Keywords: the 2-D resistive sensor array; zero potential circuit; improved zero potential circuit; measurement; crosstalk the 2-D resistive sensor array; zero potential circuit; improved zero potential circuit; measurement; crosstalk
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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

Wu, J.-F.; Wang, F.; Wang, Q.; Li, J.-Q.; Song, A.-G. An Improved Zero Potential Circuit for Readout of a Two-Dimensional Resistive Sensor Array. Sensors 2016, 16, 2070.

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