CHEMFET operation without a reference electrode

Details CHEMFET operation without a reference electrode CHEMFET operation without a reference electrode

1985-09-03

1987-12-29

James, Andrew J.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307308, 324 715, 204406, H01L 2966

Patent

active

047164484

ABSTRACT:
A depletion mode chemically sensitive field effect transducer device has a gate region adapted to interface with a solution so as to generate an electrochemical interfacial potential. A d.c. voltage potential is applied between the source and drain to cause a source-drain current to flow when a variable conductance channel connects the source and drain. A time-variant bulk potential is applied to the substrate and alternately opens and closes the conductive channel. The chemical property of interest of the solution thus can be determined by variations in bulk threshold voltage levels at which a predetermined source-drain current flows, without the use of a reference electrode in contact with the solution.

REFERENCES:
patent: 4020830 (1977-05-01), Johnson
patent: 4269682 (1981-05-01), Yano
patent: 4488556 (1984-12-01), Ho

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