Supply Modulation of Power Amplifiers with a Class AD Modulator
Conference: GeMiC 2009 - German Microwave Conference
03/16/2009 - 03/18/2009 at München, Germany
Proceedings: GeMiC 2009
Pages: 4Language: englishTyp: PDF
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Authors:
Dettmann, I. (Rohde & Schwarz GmbH & Co. KG, 81671 München, Germany)
Berroth, M. (Institute of Electrical and Optical Communications Engineering, Universität Stuttgart, 70569 Stuttgart, Germany)
Abstract:
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.