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Supply Modulation of Power Amplifiers with a Class AD Modulator

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2 Author(s)
Dettmann, I. ; Rohde & Schwarz GmbH & Co. KG, Munich ; Berroth, M.

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.

Published in:

Microwave Conference, 2009 German

Date of Conference:

16-18 March 2009