ISFET drawbacks minimization using a novel electronic compensation

Casans, S.; Muñoz, David; Navarro, A.E.; Salazar, Armando

doi:10.1016/j.snb.2003.09.015

Cited by 31 publications

(27 citation statements)

References 7 publications

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“…Very little research has been conducted on drift compensation techniques such as eliminating drift as a common mode signal by using an ISFET/REFET pair [14], neglecting the drift over a short-time interval of several seconds due to a relatively longer time constant of drift in the order of several hours [15] and employment of negative feedback in the electronic path [16]. Unfortunately, all these methods require a thermo-stable condition to avoid the temperature dependence of ISFET.…”

Section: Introductionmentioning

confidence: 99%

An Intelligent ISFET Sensory System With Temperature and Drift Compensation for Long-Term Monitoring

Chen

Chan

2008

IEEE Sensors J.

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This 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.Index Terms-Intelligent sensor, ISFET drift, ISFET interface circuit, ISFET temperature compensation, long-term monitoring, microcontroller sensor system, precision current mirror, water quality monitoring.

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Section: Introductionmentioning

confidence: 99%

An Intelligent ISFET Sensory System With Temperature and Drift Compensation for Long-Term Monitoring

Chen

Chan

2008

IEEE Sensors J.

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“…It should be noted that the sensitivity of urea and creatinine sensors are not high, however they are typical of these types of EnFET sensors, which in general give relatively low output signal changes corresponding to input concentration changes. Notably, low sensitivity [1,7,9,14] together with drift [15][16][17][18] are the two inherent aspects of this particular EnFETs which has been adapted from an integrated ISFET. These issues will need to be addressed in order to take the results of the research work presented here into development of a commercially viable clinical instrument.…”

Section: Resultsmentioning

confidence: 99%

Measurement of urea, creatinine and urea to creatinine ratio using enzyme based chemical current conveyor (CCCII+)

Pookaiyaudom

Seelanan

Lidgey

et al. 2011

Sensors and Actuators B: Chemical

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“…Casans et al (2004) showed an instrumentation system designed to compensate long-term drift on ISFETs. Smart compensation (Chen and Chan, 2008) is processed by two approaches: 1 It utilizes a dynamic biasing current temperature compensation technique to provide optimum biasing current for ISFET dynamically.…”

Section: Discrete Mosfet Segment Ph-sensitive Componentmentioning

confidence: 99%

“…13.2 Instrumentation-based enhancement of ISFET performance As ISFET's performance depends on many parameters, it is important to employ a compensation method to prevent those (Casans et al, 2004). To compensate drift and hysteresis, ISFET response must be conditioned with an electronic (hardware and software) instrumentation system.…”

Section: Compromising Solutionsmentioning

confidence: 99%

Remedial and adaptive solutions of ISFET non‐ideal behaviour

Khanna

2013

Sensor Review

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Purpose -This paper aims to focus on the steps necessary to bolster marketability of ISFET-based sensors, keeping in view the present technological status of ISFET and its limitations. Design/methodology/approach -Technical problems inhibiting commercialization of ISFET-based sensors are highlighted. The problems considered include sensitivity, drift, cleaning, disposability, reference systems, chip structural designs, packaging, light, temperature, hysteresis and body effects, and instability of biosensors. Available solutions are prescribed, discussing both direct and indirect ways of addressing the problems of ISFET sensors.Findings -The history of progress of ISFET (Ion-sensitive Field-Effect Transistor) is synonymous with the ways and means devised by different researchers for surmounting (direct approach) or acclimatizing to the shortcomings of this device (indirect approach). Signal conditioning hardware and software considerably help in obviating issues such as drift, hysteresis and thermal effects. Research limitations/implications -Reliable on-chip reference electrodes and ISFET packaging for continuous online applications are interesting research areas. Practical implications -Where a plausible solution exists, it should be readily availed; otherwise the device limitation should be understood and ingeniously bypassed. Compromising solutions targeted on the specific applications pave the way towards widespread utilization of these sensors in industrial, biomedical, food and environmental sectors. Originality/value -The study helps in understanding the problems besetting utilization of ISFETs, calling attention to essential remedies for ISFETbased products. It provides information of value to those involved in ISFET measurements.

show abstract

ISFET drawbacks minimization using a novel electronic compensation

Cited by 31 publications

References 7 publications

An Intelligent ISFET Sensory System With Temperature and Drift Compensation for Long-Term Monitoring

An Intelligent ISFET Sensory System With Temperature and Drift Compensation for Long-Term Monitoring

Measurement of urea, creatinine and urea to creatinine ratio using enzyme based chemical current conveyor (CCCII+)

Remedial and adaptive solutions of ISFET non‐ideal behaviour

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