Analysis of current sources on the operational amplifiers according to their precision requirements in a wide frequency range for Electrical Impedance Tomography problems

Authors

DOI:

https://doi.org/10.20535/RADAP.2013.54.24-32

Keywords:

Electrical Impedance Tomography, current source, operational amplifiers, transconductance amplifier, precision, wide frequency band

Abstract

Introduction. The typical approaches for the current sources designing are considered. The difficulties of providing their precision in a wide frequency range are formulated. The necessary requirements for their precision in a wide frequency range are also specified. Formulation  of the problem. The most of existing current sources are implemented using operational amplifiers. It is shown by short review of them. Such solutions do not fully provide the requirements of precision in their work in a wide frequency range. The possibility of using operational amplifiers is analyzed; the limits of their application are determined. The research methods and the analysis of results. The load current on the frequency analytical dependencies for these schemes were calculated and critically analyzed. The results are illustrated on the graphs. The ratios for practical recommendations for such schemes designing are calculated. Conclusions.  The arguments for inexpediency of operational amplifiers application for schemes of current sources in all frequency range are presented. The operational amplifiers with a greater bandwidth should be used for large load resistance values. The other elements of the electrical circuits (namely transconductance amplifiers) using is proposed.

Author Biographies

E. V. Gaydayenko, National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev

Postgraduate student

A. V. Movchanyuk, National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev

Cand. of Sci (Technics), Associate Professor

A. I. Rybin, National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev

Doc. of Sci (Technics), Professor

References

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References

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Al-Obaidi A. A new enhanced howland voltage controlled current source circuit for EIT application / A. Al-Obaidi., M. Meribout // IEEE GCC Conference and Exhibition, February 19-22, Dubai, – 2011. – P. 327–330.

XiaokeL. Analysis of Constant-Current Characteristics for Current Sources / L. Xiaoke., D.Feng., F.Yan // Control and Decision Conference (CCDC), 24th Chinese. – 2012. –P. 2607–2612.

Tucker A.S. Biocompatible, High Precision, Wideband, Improved Howland Current Source With Lead-Lag Compensation / A. S.Tucker., M. F. Robert., R. J. Sadleir // Biomedical Circuits and Systems Journal. –2012. – №99. – P. 1–8.

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Horovits P., Hill U. Iskusstvo shemotehniki: V 3-h tomah, per. s angl. B. N. Bronin i dr. Moscow, Mir, 1998, 418 p.

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Published

2013-11-01

How to Cite

Гайдаенко, Е., Мовчанюк, А. and Рыбин, А. (2013) “Analysis of current sources on the operational amplifiers according to their precision requirements in a wide frequency range for Electrical Impedance Tomography problems”, Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, 0(54), pp. 24-32. doi: 10.20535/RADAP.2013.54.24-32.

Issue

No. 54 (2013)

Section

Radio Circuits and Signals

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