Supply Modulation of Power Amplifiers with a Class AD Modulator

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 impr...

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Bibliographic Details
Main Authors: Dettmann, I., Berroth, M.
Format: Conference Proceeding
Language:English
Subjects:
Bandwidth
Linearity
Optical amplifiers
Power amplifiers
Power generation
Power supplies
Radio frequency
Radiofrequency amplifiers
RF signals
Voltage
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Summary: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.
ISSN:2167-8022
2167-8030
DOI:10.1109/GEMIC.2009.4815868