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.
This paper describes a power amplifier operating at X-band demonstrating 61% power added efficiency (PAE) at 10 GHz associated with 14 W output power in CW mode. The design uses a 0.15µm GaN 3MI process from TriQuint TM . The devices operate at a peak power density of 3.8 W/mm at 10 GHz with a PAE higher than 48% over a 500-MHz bandwidth. The two-stage MMIC PA has a saturated gain of 19 dB at peak efficiency. The total size of the chip is 9.2 mm 2 .
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.