Analysis of current sources on the operational amplifiers according to their precision requirements in a wide frequency range for Electrical Impedance Tomography problems
Journal Title: Вісник НТУУ КПІ. Серія Радіотехніка, Радіоапаратобудування - Year 2013, Vol 0, Issue 54
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.
Authors and Affiliations
E. Gaydayenko, A. Movchanyuk
Keywords
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- EP ID EP309038
- DOI 10.20535/RADAP.2013.54.24-32
- Views 63
- Downloads 0
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