INSTITUTE OF ELECTRICAL AND
ELECTRONIC ENGINEERS WAVES AND DEVICES PHOENIX CHAPTER April
12, 2006 MTTS Meeting
A Low Budget Harmonic Load-pull System for
High Power Amplifier Design
Steve C. Cripps, Ph. D.
Hywave
Associates
Somerset, England
Empirical techniques continue to play a much bigger role in RF design than most care to admit. The PA community, however still embrace measurement-based characterisation and design, especially when the power becomes “high”, which above 2GHz means anything above a few watts. This paper will review the various load-pull techniques, including both active and passive approaches, for the design of efficient, linear RF PAs. A low cost system will be described which enables real-time, independent impedance control at fundamental and harmonic frequencies, something which commercial manufacturers have struggled to achieve. Some measurement results will also be presented.
Dr Cripps obtained his Ph.D. and master’s degrees from Cambridge University, England. Since starting work at Plessey Research Labs in 1974, he has been involved in most aspects of Gallium Arsenide technology and circuit applications. From 1981 he worked in the USA, holding technical and management positions at Watkins Johnson, Loral, and Celeritek. He became an independent consultant in 1990 and specialized in high efficiency RFIC PA design for mobile phones. He returned to England in 1996, where he has been involved mainly with high power PAs for cellular base stations. His current technical activities are focused on the characterization of memory effects in RF power amplifiers, and the development of advanced loadpull techniques.
Dr. Cripps is the author of two books on RF power amplifier design, both of which are listed as best-sellers by Artech House, “RF Power Amplifiers for Wireless Communications” (1998), and “Advanced Techniques for RF Power Amplifier Design” (2001). He holds five U.S. patents.
Date: April 12, 2006
Location: Group Conference Rm, Bldg 94, Freescale Semiconductor, 2100 E. Elliot Rd., Tempe, AZ
Use Freescale Main Entrance (South) facing Elliot Road
Time: 5:30 - 6:30pm Presentation
For more information, please call Chuck Weitzel (Chapter Chair) at (480) 413-5906.
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CARDIFF INSTITUTE FOR THE BLIND EMPLOYMENT PACK
EARTHQUAKE ENGINEERING RESEARCH INSTITUTE OREGON STATE UNIVERSITY
FORMA PARA AYUDA FINANCIAL EL WOMEN’S WILDERNESS INSTITUTE
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