ISFET-based measuring device and method for correcting drift

Details ISFET-based measuring device and method for correcting drift ISFET-based measuring device and method for correcting drift

1984-10-29

1987-10-20

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204402, 204406, 204433, 357 25, G01N 2746

Patent

active

047012536

ABSTRACT:
The measuring device (10) comprises an ISFET (12) used as a chemically selective ion sensor, a reference electrode (20) positioned adjacent the ISFET (12), an amplifier (22) coupled to the ISFET and control/correction circuitry (30) coupled to the ISFET (12), to the reference electrode (20) and to the amplifier (22). The control/correction circuitry (30) is operable to maintain the drain-source current I.sub.DS of the ISFET (12) at a constant value and to correct drift effects of the ISFET (12) on the basis of the logarithmic equation:

REFERENCES:
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patent: 4207146 (1980-06-01), Kunke
patent: 4218746 (1980-08-01), Koshiishi
patent: 4269684 (1981-05-01), Zick
patent: 4273636 (1981-06-01), Shimada et al.
patent: 4384925 (1983-05-01), Stetter et al.
patent: 4411741 (1983-10-01), Janata
patent: 4481804 (1984-11-01), Eberhard
patent: 4488556 (1984-12-01), Ho
patent: 4499423 (1985-02-01), Matthiessen

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