Excitation-independent constant conductance isfet driver

Maciej Kokot; Tadeusz Ossowski

Excitation-independent constant conductance isfet driver

Abstract

A new constant conductance driver for ISFETs sensors has been developed. The proposed circuit maintains the sensor operating point at constant drain-source conductance. The combination of a simple, self-balancing resistance bridge and the subtraction half (or similar fraction) of source-drain voltage from the gate-source voltage provides the independence of output signal from current and voltage drivers instability. The use of precision current sources or high class operating amplifiers is not required. The operating point depends on precision bridge resistors only. The driver presented here simplifies applications of ISFET sensors in battery powered handheld devices without the accuracy trade-off which the second part of the paper shows.

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Category:: Articles
Type:: artykuł w czasopiśmie indeksowanym TR Master Journal List
Published in:: Metrology and Measurement Systems no. XVI, pages 33 - 41,
ISSN: 0860-8229
Language:: English
Publication year:: 2009
Bibliographic description:: Kokot M., Ossowski T.: Excitation-independent constant conductance isfet driver// Metrology and Measurement Systems. -Vol. XVI., nr. iss. 4 (2009), s.33-41
Verified by:: Gdańsk University of Technology