title: High-Accuracy, Compact Scanning Method and Circuit for Resistive Sensor Arrays.
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.
authors.affiliation: Department of Electronic Engineering, Hanyang University, 222 Wangsimni-ro, Deongdong-gu, Seoul 04763, Korea. jskim383@hanyang.ac.kr.
authors.forename: Jong-Seok
authors.initials: JS
authors.lastname: Kim
authors.affiliation: Department of Electronic Engineering, Hanyang University, 222 Wangsimni-ro, Deongdong-gu, Seoul 04763, Korea. dy.kwon87@gmail.com.
authors.forename: Dae-Yong
authors.initials: DY
authors.lastname: Kwon
authors.affiliation: Department of Electronic Engineering, Hanyang University, 222 Wangsimni-ro, Deongdong-gu, Seoul 04763, Korea. bdchoi@hanyang.ac.kr.
authors.forename: Byong-Deok
authors.initials: BD
authors.lastname: Choi
keywords: crosstalk; read-out circuit; resistive sensor; row driver; sensor array
references.citation: Nat Mater. 2010 Oct;9(10):821-6
references.pmid: 20835235
references.citation: Sensors (Basel). 2011;11(3):3249-66
references.pmid: 22163797
references.citation: Nature. 2013 Jul 25;499(7459):458-63
references.pmid: 23887430