Номер журнала: 2020.3
Заголовок статьи: The cartesian feedback loop stability analysis for power amplifiers linearization
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 non-linear 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.
cartesian feedback, loop gain, stability, loop filter, Nyquist criterion, Popov criterion
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