Abstract
In recent years, many articles came out where one could find the analysis of oscillatory systems of electric sinusoid signals generators with amplifiers called CFOA—current feedback operational amplifiers. As a rule, the analysis of such systems is made by applying mathematical modeling methods on the basis of the amplifier linear model, which does not allow estimating advantages and disadvantages of the systems realized with those amplifiers in comparison with classical systems. A nonlinear model of a current feedback operational amplifier (CFOA) is introduced in the paper; nonlinearity of “current mirror” is reflected in the form of current double limiting. The analysis of two known oscillatory systems has been carried out with the use of this non-linear model. Dependence between current limiting level, output voltage amplitude, and maximum oscillation frequency has been obtained. The paper shows that output current limiting under current output connection of capacitive load reduces frequency range and output voltage amplitude considerably and increases harmonic distortions in comparison with classical oscillatory systems. The research done has found that the application of new amplifiers does not give considerable advantages to the oscillatory systems with CFOA.
Highlights
In the end of the last century a new operational amplifier in the monolithic form appeared in the market of electronic components
The analysis was done on the basis of linear models of current feedback operational amplifier (CFOA), so it has limited use and does not allow disclosing all advantages and disadvantages
Taking into account the fact that oscillatory systems (OSs) is a basis of any electric signals generator, as periodic oscillation is excited and established there, and OS determines their form and basic parameters, the author makes an attempt to analyze OS on the basis of CFOA nonlinear model exemplified by two OSs
Summary
In the end of the last century a new operational amplifier in the monolithic form appeared in the market of electronic components. The amplifier was called a current feedback operational amplifier (CFOA). The description of the circuit technology of the new amplifiers is given in the materials of manufacturing companies [1, 2]. There is a detailed description of AD844 amplifier (Rybin [3]) Such amplifiers provoked great interest amidst developers of electronic devices, for example, oscillatory systems (OSs) of electric signals generators. Taking into account the fact that OS is a basis of any electric signals generator, as periodic oscillation is excited and established there, and OS determines their form and basic parameters, the author makes an attempt to analyze OS on the basis of CFOA nonlinear model exemplified by two OSs
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