6 research outputs found
Over 10MHz Bandwidth Envelope-Tracking DC/DC Converter for Flexible High Power GaN Amplifiers
No full textInternational audienceThis 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
A prospective study of minimal residual disease in childhood Bâlineage acute lymphoblastic leukaemia: MRD level at the end of induction is a strong predictive factor of relapse
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