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Sensors 2016, 16(2), 155; doi:10.3390/s16020155

High-Accuracy, Compact Scanning Method and Circuit for Resistive Sensor Arrays

Department of Electronic Engineering, Hanyang University, 222 Wangsimni-ro, Deongdong-gu, Seoul 04763, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 26 November 2015 / Revised: 15 January 2016 / Accepted: 21 January 2016 / Published: 26 January 2016
(This article belongs to the Section Physical Sensors)
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Abstract

The zero-potential scanning circuit is widely used as read-out circuit for resistive sensor arrays because it removes a well known problem: crosstalk current. The zero-potential scanning circuit can be divided into two groups based on type of row drivers. One type is a row driver using digital buffers. It can be easily implemented because of its simple structure, but we found that it can cause a large read-out error which originates from on-resistance of the digital buffers used in the row driver. The other type is a row driver composed of operational amplifiers. It, very accurately, reads the sensor resistance, but it uses a large number of operational amplifiers to drive rows of the sensor array; therefore, it severely increases the power consumption, cost, and system complexity. To resolve the inaccuracy or high complexity problems founded in those previous circuits, we propose a new row driver which uses only one operational amplifier to drive all rows of a sensor array with high accuracy. The measurement results with the proposed circuit to drive a 4 × 4 resistor array show that the maximum error is only 0.1% which is remarkably reduced from 30.7% of the previous counterpart. View Full-Text
Keywords: resistive sensor; sensor array; crosstalk; read-out circuit; row driver resistive sensor; sensor array; crosstalk; read-out circuit; row driver
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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

Kim, J.-S.; Kwon, D.-Y.; Choi, B.-D. High-Accuracy, Compact Scanning Method and Circuit for Resistive Sensor Arrays. Sensors 2016, 16, 155.

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