Title :
Supply Modulation of Power Amplifiers with a Class AD Modulator
Author :
Dettmann, I. ; Berroth, M.
Author_Institution :
Rohde & Schwarz GmbH & Co. KG, Munich
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.
Keywords :
III-V semiconductors; gallium arsenide; power amplifiers; power semiconductor devices; GaAs; back off; class AD modulator; power 5 W; power amplifiers; signal bandwidth; supply modulation concept; Bandwidth; Linearity; Optical amplifiers; Power amplifiers; Power generation; Power supplies; RF signals; Radio frequency; Radiofrequency amplifiers; Voltage;
Conference_Titel :
Microwave Conference, 2009 German
Conference_Location :
Munich
Print_ISBN :
978-3-9812668-0-1
Electronic_ISBN :
978-3-8007-3150-3
DOI :
10.1109/GEMIC.2009.4815868
