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Optimization criteria for power amplifiers

Published online by Cambridge University Press:  03 February 2011

Jacques B. Sombrin
Jacques B. Sombrin*
Affiliation:
CNES, 18 Avenue Edouard Belin, 31401 Toulouse Cedex 1, France. Phone: +33 5 61 27 32 17.
*
Corresponding author: J.B. Sombrin Email: jacques.sombrin@free.fr
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Abstract

This paper describes existing and new criteria for comparison and optimization of non-linear power amplifiers such as RF or microwave transmitters. In addition to intermodulation, receiver noise, and losses in the transmission system, the proposed new criteria take into account efficiency or consumed power. This results in the global optimization of a combined signal-to-noise-plus-intermodulation ratio as a function of saturated or nominal power but also consumed or dissipated power. Saturated power is limited by available technology. Consumed power and dissipated power are some of the main constraints in telecommunication satellite payloads, mobile phone handsets, and RFID (Radio Frequency IDentification). Another constraint comes from the limited size of antennas, which limits the system equivalent isotropic radiated power and gain-to-temperature ratio. With the proposed criteria the designer will be able to compare different amplifier technologies and to optimize the design and operating point of each stage of a multistage amplifier or a linearizer for a given amplifier. Interference from same or other systems is also introduced in the optimization through the use of signal-to-noise-plus-IM-plus-interference ratio criteria.

Keywords

Power Amplifiers and Linearizerssatellite, transmission linkintermodulationSNIRC/(N+I)optimizationmultiple constraints marginsTWTTWTApower efficiencyspectrum efficiencyRFIDhandheld devices
Type
Original Article
Information
International Journal of Microwave and Wireless Technologies , Volume 3 , Issue 1 , February 2011 , pp. 35 - 45
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2011

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References

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