dc.contributor.authorChen, D. Y.
dc.contributor.authorChan, Pak Kwong
dc.date.accessioned2010-05-06T03:55:59Z
dc.date.available2010-05-06T03:55:59Z
dc.date.copyright2008en_US
dc.date.issued2008
dc.identifier.citationChen, D. Y., & Chan, P. K. (2008). An Intelligent ISFET Sensory System With Temperature and Drift Compensation for Long-Term Monitoring. IEEE Sensor Journal. 8(12), 1948-1959.en_US
dc.identifier.issn1530-437Xen_US
dc.identifier.urihttp://hdl.handle.net/10220/6273
dc.description.abstractThis paper presents a new intelligent ISFET sensory system dedicated to a precision pH sensory function, as well as a long-term monitoring capability without being jeopardized by temperature and drift fluctuations in the water-quality monitoring environment. It includes the novel compensation technique for counteracting a simultaneous change of temperature and drift, the design of the sensory system incorporating hardware and software co-design for enhancing the performance stability of a standard ISFET device and a new programmable current source with reduced dynamic current error for a dedicated temperature compensation process. The proposed ISFET sensory system, with about a 0.01 pH resolution in system design at a 3.3 V supply, has been validated by the experiments, exhibiting a maximum accuracy error of 0.02 pH at 23°C and 0.05 pH at 40°C with dual compensation. The compensation results show a maximum time drift of 0.003 pH/°hour (0.166 mV/°hour) at 23°C and an average temperature drift of 0.00049 pH hour°C (0.0245 mV hour°C) for a reference temperature increase from 23°C to 40°C, with the value of the pH solution ranging from 4 to 9 in six-hour measurements. These measured results outperform those of the reported drift reduction techniques, suggesting that the ISFET sensory system using novel compensation can provide significant immunity against temperature change, time drift, and temperature drift, which are favorable towards robust measurements in environmental monitoring applications.en_US
dc.format.extent12 p.en_US
dc.language.isoenen_US
dc.relation.ispartofseriesIEEE sensor journalen_US
dc.rights© 2008 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. http://www.ieee.org/portal/site This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.en_US
dc.subjectDRNTU::Engineering::Electrical and electronic engineering
dc.titleAn intelligent ISFET sensory system with temperature and drift compensation for long-term monitoringen_US
dc.typeJournal Article
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen_US
dc.identifier.doihttp://dx.doi.org/10.1109/JSEN.2008.2006471
dc.description.versionPublished versionen_US


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