The cartesian feedback loop stability analysis for power amplifiers linearization
Abstract
When linearizing power amplifiers using cartesian feedback, the power amplifier distortion products suppression degree, as in other feedback systems, is determined by the loop gain. The linearization system includes a large number of blocks with a frequency dependent gain and a phase, which have a significant effect on the system stability. The article presents the cartesian feedback stability by the Nyquist criterion with the power amplifier linear model, as well as analysis by the Popov criterion for the power amplifier nonlinear model. The influence of the loop filter order, cutoff frequency, and approximation is investigated. It is shown that the stability boundaries constructed by using the Nyquist criterion and the Popov criterion for the cartesian loop coincide.
References
1. Briffa M. A. Linearization of RF Power Amplifiers // PhD thesis, Melbourne, Australia. 1996. 195 p.
2. Коновалов Б. И., Лебедев Ю. М. Теория автоматического управления: учебное пособие. Томск: Факультет дистанционного обучения, ТУСУР, 2010. 162 с.
3. Яковлева Е. М., Замятин С. В. Курсовое проектирование по теории автоматического управления: учебное пособие. Томск: Изд-во Томского политехнического университета, 2010. 106 с.
4. Попов Е. П. Теория нелинейных систем автоматического регулирования и управления: учебное пособие. М.: Наука, 1988. 256 с.
5. Dawson J. L, Lee T. H. Feedback Linearization of RF Power Amplifiers. Kluwer Academic Publishers New York, Boston, Dordrecht, London, Moscow. 2004. P. 134.
6. Молодцов А. С., Косых А. В. Анализ работы декартовой (cartesian) системы обратной связи в радиочастотных усилителях мощности // Омский научный вестник. 2013. № 2 (120). С. 312-314.
7. Ohishi Y., Minowa M., Fukuda E., Takano T. Cartesian feedback amplifier with soft landing // Proc. Third IEEE International Symposium Personal, Indoor and Mobile Radio Communications (PIMRC), 1992. Р. 402-406.
8. Wood J. Behavioral Modeling and Linearization of RF Power Amplifiers. Artech house. London, 2014. P. 109.
Review
For citations:
Fakhrutdinov R... The cartesian feedback loop stability analysis for power amplifiers linearization. The Herald of the Siberian State University of Telecommunications and Information Science. 2020;(3):79-89. (In Russ.)
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