ISFET-based measuring device and method for correcting drift
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United States of America Patent
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Oct 20, 1987
Grant Date -
N/A
app pub date -
Oct 29, 1984
filing date -
Nov 3, 1983
priority date (Note) -
Expired
status (Latency Note)
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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: .DELTA.V.sub.p =A 1n(t/t.sub.o +1 ) where: .DELTA.V.sub.p =potential drift A=scale factor for drift and amplitude t.sub.o =time constant defining the dependence on time t=time during which the sensor is operative in the event of continuous operation.
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