Community Research and Development Information Service - CORDIS

Theoretical basis for modelling of ISFET sensors

As one of scientific results of SEWING project a theory of ISFET ion-sensitive sensors has been developed. This theory was so far presented in a variety of conference proceedings and now it is being prepared for a final publication in one of the sensor magazines. This theory of ion-selective sensors has become a base of innovative computer models of chemical sensors.

These models have found wide application in practice of computer-aided design of sensor systems. The practical results consist of two parts: a model of the internal depletion FET of the ISFET sensor and a model of a ion-selective membrane working as a chemo-electrical transducer. The electrical model was developed in two versions: compatible with SPICE and dedicated to HDL simulators (based on Merckel theory of FET). Both versions are physical. The model of the chemo-electrical transducer was elaborated for pH sensitive ISFETs and for arbitrary ion-selective CHEMFETs. The latter takes the form of a new, so called, super-Nikolski model not known so far in literature.

Elaborated scientific results are fundamental, they are of wide interest and have broad applications in chemical sensor systems. They have been implemented in the software controlling the final demonstrator in SEWING project and will be disseminated also in literature. Especially super-Nikolski model is useful for CHEMFET characterization, simulation and data-fusion software.

Different models created in this project are available in model libraries and on different software platforms.

These models will be developed in the future by extension to other types of sensors. They will be used in new, industrial versions of the SEWING system.

More information on the Sewing project can be found at:

Reported by

Warsaw University of Technology
Nowowiejska 15/19
00-665 Warsaw
See on map
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top