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Global stability analysis and stabilization of a class-E/F amplifier with a distributed active transformer

Jeon, Sanggeun and Suárez, Almudena and Rutledge, David B. (2005) Global stability analysis and stabilization of a class-E/F amplifier with a distributed active transformer. IEEE Transactions on Microwave Theory and Techniques, 53 (12). pp. 3712-3722. ISSN 0018-9480. doi:10.1109/TMTT.2005.856083.

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Power amplifiers (PAs) often exhibit instabilities giving rise to frequency divisions or spurious oscillations. The prediction of these instabilities requires a large-signal stability analysis of the circuit. In this paper, oscillations, hysteresis, and chaotic solutions, experimentally encountered in a high-efficiency class-E/F/sub odd/ PA with four transistors combined using a distributed active transformer, are studied through the use of stability and bifurcation analysis tools. The tools have enabled an in-depth comprehension of the different phenomena, which have been observed in simulation with good agreement with experimental results. The study of the mechanism generating the instability has led to a simplified equivalent circuit from which the optimum stabilization network has been determined. The network enables a global stabilization of the circuit for all the expected operating values of the amplifier bias voltage and input power. This has been achieved with negligible degradation of the amplifier performance in terms of drain efficiency and output power. The stable behavior obtained in simulation has been experimentally confirmed.

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Additional Information:© Copyright 2005 IEEE. Reprinted with permission. Manuscript received February 22, 2005; revised May 5, 2005. Posted online: 2005-12-05 This work was supported by the Lee Center for Advanced Networking and by the Jet Propulsion Laboratory. The authors would like to thank S. Weinreb, Jet Propulsion Laboratory, Pasadena, CA, K. Potter and F. Wang, both of the California Institute of Technology, Pasadena, and J.-M. Collantes, University of the Basque Country, Bilbao, Spain, for their advice and discussions.
Subject Keywords:Bifurcation; chaos; distributed active transformer (DAT); hysteresis; stability analysis; stabilization; switching amplifiers
Issue or Number:12
Record Number:CaltechAUTHORS:JEOieeetmtt05
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1707
Deposited By: Archive Administrator
Deposited On:13 Feb 2006
Last Modified:08 Nov 2021 19:41

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