GaN Electronic Devices for Microwave Power Applications
S.C. Binair, K. Ikossi-Anastasiou, J.A. Roussos, D. Park, D.D. Koleske, A.E. Wickenden, R.L. Henry
The dc, small-signal, and microwave power output characteristics of AlGaN/GaN HEMTs are presented. HEMTs with maximum drain current greater than 1 A/mm, gate-drain breakdown over 80V, and fT of 30 GHz for a 4.0 mm gate have been demonstrated. Trapping effects, related to both surface and buffer layers, that limit device power performance are discussed. At 3.8 GHz, a CW power density of 3.1 W/mm and a pulsed power density of 5.9 W/mm have been achieved.