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 DCIDC converter for spaceborne application. A demonstrator has been built and mated with a RF GaN HEMT output stage. The CII measurement for lO-12W RF output power close to saturation show a linearity improvement by 5-8d8 and an efficiency improvement of up to 8 points when compared to the case of no tracking circuit.
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