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

Title
High-Accuracy, Compact Scanning Method and Circuit for Resistive Sensor Arrays
Author
최병덕
Keywords
sensor array; resistive sensor; crosstalk; read-out circuit; row driver
Issue Date
2016-01
Publisher
MDPI AG
Citation
SENSORS, v. 16, NO 2, Page. 1-16
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 x 4 resistor array show that the maximum error is only 0.1% which is remarkably reduced from 30.7% of the previous counterpart.
URI
http://www.mdpi.com/1424-8220/16/2/155http://hdl.handle.net/20.500.11754/31456
ISSN
1424-8220
DOI
10.3390/s16020155
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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