Journal of the Korean Institute of Telematics and Electronics A (전자공학회논문지A)
- Volume 28A Issue 12
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- Pages.46-52
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- 1991
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- 1016-135X(pISSN)
One-Chip Integration of a New Signal Process Circuit and an ISFET Urea Sensor
새로운 신호처리회로와 ISFET 요소센서의 단일칩 집적
Abstract
A new signal process circuit using two ISFETs as the input devices of the MOS differential amplifier stage for an ISFET biosensor has been developed. One chip integration of the newly developed signal process circuit, ISFETs and a Pt quasi-reference electrode has been carried out according to modified LOCOS p-well CMOS process. The fabricated chip showed gains of 0.8 and 1.6, good liniarity in the input-output relationship and very small power dissipation, 4mW. The chip was applied to realize a urea sensor by forming an immobilized urease membrane, using lift-off technique. on the gate of an ISFET. The urea sensor chip showed stable responses in a wide range of urea concentrations.
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