Stability criteria for power amplifiers under mismatch effects

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URI: http://hdl.handle.net/10902/10110
ISBN: 978-1-4799-8276-9
ISBN: 978-1-4799-8275-2
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Autoría
Suárez Rodríguez, AlmudenaAutoridad Unican; Ramírez Terán, Franco ArielAutoridad Unican; Sancho Lucio, Sergio MiguelAutoridad Unican
Fecha
2015
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© 2015 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.
Publicado en
IEEE MTT-S International Microwave Symposium (IMS), Phoenix, Arizona, 2015, 1041-1044
Editorial
IEEE
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Palabras clave
Stability analysis
Bifurcation
Antenna mismatch
Resumen/Abstract
Potential instability of power amplifiers (PAs) under mismatch effects is analyzed, with emphasis on the impact of the PA termination at the fundamental frequency. A large-signal version of the μ factor is derived, considering the lower and upper sideband of the fundamental frequency as virtual observation ports. This requires the application of the conversion matrix approach to each steady-state solution obtained with harmonic balance when varying the fundamental termination. To evaluate the impact of the fundamental output load, a contour technique is used to assemble loads giving the same μ value. A stabilization procedure is provided, based on the mapping of the mismatched load onto the stable region of the fundamental termination Smith chart. The analysis is extended to consider the baseband frequency, using three virtual observation ports.
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