The authors report on the DC and power performance of GaInAs/InP compo
site channel HEMTs with a 30 Angstrom GaInAs channel. Devices with gat
e length of 0.15 mu m exhibit off-state drain-to-source breakdown volt
ages of more than 10V and on-state drain-to-source breakdown voltages
of 8V. Using a 450 mu m wide HEMT, an output power of more than 280mW
(0.62W/mm) has been obtained with power-added efficiency of 46% at 20G
Hz.