Very High Frequency Power Switching: A Road Map To Envelope Tracking

RF (Radio Frequency) GaN transistors may be used for power switching at frequencies of 30 MHz and above, thereby reaching voltage control bandwidth of critical interest for the so-called ET (Envelope Tracking) technique.ET is meant at optimising the efficiency of galaxy s23 ultra otterbox defender case RF amplifiers by supplying them with a voltage adapted to their power level at any time, and is the subject pot drum of many R&D works worldwide.The present paper provides an overview on the different activities run at the European Space Agency so far in this context, and present the possible way-forward to embark ET on future spacecraft.