Over 10MHz bandwidth envelope-tracking DC/DC converter for flexible high power GaN amplifiers

This paper describes a fast envelope-tracking circuit capable of 10 MHz (up to 17.5 MHz) bandwidth based on RF GaN switching devices and 50 MHz switching frequency. The efficiency of the VHF converter is 84% to 90% which is comparable to a conventional DC/DC converter for spaceborne application. A d...

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Bibliographic Details
Published in2011 IEEE MTT-S International Microwave Symposium pp. 1 - 4
Main Authors Le Gallou, N., Sardin, D., Delepaut, C., Campovecchio, M., Rochette, S.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2011
Subjects
DC/DC converter
envelope-tracking
Gallium nitride
GaN technology
HEMTs
HPA
Indexes
Pulse width modulation
Radio frequency
Resonant frequency
SSPA
Switches
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Summary:This paper describes a fast envelope-tracking circuit capable of 10 MHz (up to 17.5 MHz) bandwidth based on RF GaN switching devices and 50 MHz switching frequency. The efficiency of the VHF converter is 84% to 90% which is comparable to a conventional DC/DC converter for spaceborne application. A demonstrator has been built and mated with a RF GaN HEMT output stage. The C/I measurement for 10-12W RF output power close to saturation show a linearity improvement by 5-8 dB and an efficiency improvement of up to 8 points when compared to the case of no tracking circuit.
ISBN:1612847544
9781612847542
ISSN:0149-645X
2576-7216
DOI:10.1109/MWSYM.2011.5972825