CW operation of short-channel GaN/AlGaN doped channel heterostructure field effect transistors at 10 GHz and 15 GHz

We report on a 0.15-μm gate length AlGaN/GaN doped channel heterostructure field effect transistor (DC-HFET) with maximum frequency of oscillation in excess of 97 GHz. HFETs based on our doped channel design exhibited CW microwave operation up to 15 GHz with a maximum output power of approximately 270 mW/mm at 10 GHz. These values are still limited by parasitics and can be significantly improved by optimizing the device design.