What designs for coming supercomputers?

Summary form only given. The paper introduces a new pulsed measurement system for the characterization of thermal and charge trapping effects in compound semiconductor III-V FETs. Minimization of reflections are obtained by pulse generation in a 50 Ω environment and separation between DC and AC path guarantees no variations of the average voltage values of pulses. Both GaAs- and GaN-based FETs are characterized and some differences between the two technologies are outlined as far as the charge trapping behaviour is concerned.