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High efficiency and high linearity power amplifier design

✍ Scribed by Paolo Colantonio; José Angel García; Franco Giannini; Carmen Gómez; Nuno Borges Carvalho; Ernesto Limiti; José Carlos Pedro

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
425 KB
Volume
15
Category
Article
ISSN
1096-4290

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✦ Synopsis

The optimum high-frequency Class-F loading conditions are inferred, accounting for the effects of actual output device behavior, and deriving useful charts for an effective design. The important role of the biasing point selection is stressed, demonstrating that it must be different from the Class-B theoretical one to get the expected improvement. The IMD behavior of the Class-F amplifier is presented and the large-signal sweet-spot origin in the IMD output characteristics is discussed, together with possible strategies to improve intermodulation distortion performances. The control of the sweet spot position is demonstrated via proper terminating impedances, both at fundamental and harmonic frequencies and low frequencies.

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