Efficient Calculation of Stabilization Parameters in RF Power Amplifiers

MORI CARRASCAL, LIBE

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Title

Efficient Calculation of Stabilization Parameters in RF Power Amplifiers

Other institutions

Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU)
Centre National d'Études Spatiales (CNES)

Version

Postprint

Rights

© 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

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Embargoed access

URI

https://hdl.handle.net/20.500.11984/1861

Publisher’s version

https://doi.org/10.1109/TMTT.2020.3006185

Published at

IEEE Transactions on Microwave Theory and Techniques Vol. 68. N. 9. Pp. 3686-3696, 2020

xmlui.dri2xhtml.METS-1.0.item-publicationfirstpage

3686

xmlui.dri2xhtml.METS-1.0.item-publicationlastpage

3696

Publisher

IEEE

Keywords

Harmonic Transfer Function
nonlinear analysis
power amplifiers
stability analysis ... [+]

Harmonic Transfer Function
nonlinear analysis
power amplifiers
stability analysis
system identification [-]

Abstract

This paper proposes an efficient method for the calculation of the stabilization parameters in RF power amplifiers operating in periodic large-signal regimes. Stabilization is achieved by applying the principles of linear control theory for Periodic Linear Time-Varying (PLTV) systems. A numerical method is proposed to obtain the Harmonic Transfer Function that represents the system linearized around the large-signal steady state. Then, a feedback analysis is performed to calculate the closed-loop poles of the PLTV system. The proposed approach is demonstrated with two examples. Firstly, a three-stage amplifier that exhibits a low-frequency oscillation for increasing values of input power is correctly stabilized. Next, the stabilization of an unstable design that exhibits an odd-mode parametric oscillation is presented. The results of the proposed technique are compared to those obtained with the conventional parametric stability simulation. These examples serve to illustrate the capability and efficiency of the proposed approach. [-]