A CMOS potentiostat for amperometric chemical sensors

A simple CMOS integrated potentiostatic control circuit is described. The circuit maintains a constant bias potential between the reference and working electrodes. Chemical concentration signals are converted amperometrically to an output voltage with a slope of approximately 60 mV//spl mu/A. Redox...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 1987-06, Vol.22 (3), p.473-478
Main Authors: Turner, R.F.B., Harrison, D.J., Baltes, H.P.
Format: Article
Language:English
Subjects:
Analytical biochemistry: general aspects, technics, instrumentation
Analytical, structural and metabolic biochemistry
Biological and medical sciences
Biomedical measurements
Biomembranes
Biotechnology
Chemical analysis
Chemical sensors
Chemical technology
Current measurement
Electrodes
Fundamental and applied biological sciences. Psychology
Integrated circuit measurements
Methods. Procedures. Technologies
Others
Signal analysis
Sugar
Various methods and equipments
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Description
Summary:A simple CMOS integrated potentiostatic control circuit is described. The circuit maintains a constant bias potential between the reference and working electrodes. Chemical concentration signals are converted amperometrically to an output voltage with a slope of approximately 60 mV//spl mu/A. Redox currents from 0.1 to 3.5 /spl mu/A can be measured with a maximum nonlinearity of /spl plusmn/2% over this range. This design also provides the capability of performing differential measurements in order to null the effect of spurious background current. The total power consumption is less than 2 mW. Experimental results are reported showing the performance of the circuit as a chemical sensor control system.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.1987.1052753