Bifurcation analysis of stabilization circuits in an L-band LDMOS 60-W power amplifier

Creators: Wang, Feiyu; Suárez, Almudena; Rutledge, David B.

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Abstract

n this letter, the global stability analysis of an L-band push-pull power amplifier is presented. The analysis is carried out for the amplifier operating in different modes, such as Class AB, Class B, and Class E/F, considering variations in the bias voltages, the input power and the input frequency. After determination of the oscillation mode, three different stabilization techniques are applied and compared: feedback resistors, neutralization capacitors, and odd-mode stabilization resistor. The element values of each stabilization network, ensuring a stable behavior for all the operating conditions, are calculated with a bifurcation-analysis technique. Good agreement is found between measured and simulated results.

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© 2005 IEEE. "Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE." Manuscript received May 18, 2005; revised July 6, 2005. Posted online: 2005-09-26. This work was supported in part by the Jet Propulsion Laboratory and the Lee Center for Advanced Networking. The authors would like to thank S. Weinreb, C. Andricos, W. Edelstein, A. Moussessian, Jet Propulsion Laboratory, K. Potter and S. Jeon, California Institute of Technology, and J.-M. Collantes, University of the Basque Country (Spain), for their advice and discussions.

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