Supply Modulation of Power Amplifiers with a Class AD Modulator
Konferenz: GeMiC 2009 - German Microwave Conference
16.03.2009 - 18.03.2009 in München, Germany
Tagungsband: GeMiC 2009
Seiten: 4Sprache: EnglischTyp: PDF
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Autoren:
Dettmann, I. (Rohde & Schwarz GmbH & Co. KG, 81671 München, Germany)
Berroth, M. (Institute of Electrical and Optical Communications Engineering, Universität Stuttgart, 70569 Stuttgart, Germany)
Inhalt:
This paper investigates the supply modulation concept to improve the efficiency of power amplifiers in back off. The modulator is a class AD modulator which has a high efficiency while keeping a large signal bandwidth. In an experimental setup the efficiency of a 5 W GaAs power amplifier can be improved from 28% to 40% at 7dB back off.