The authors have DC, RF, and noise characterised 0.15 mu M gate-length
HFETs fabricated on a pseudomorphic Ga0.20In0.80P/Ga0.47In0.53As/InP
material grown with MOVPE. The extrinsic transconductance is 640mS/mm.
The maximum frequency of oscillation is 260GHz and the intrinsic tran
sit frequency is 165GHz. The DC and RF performances of this HFET are c
omparable with InAlAs/InGaAs/InP HFETs. The drain breakdown voltage of
this HFET is 50% higher than InAlAs/InGaAs/InP HFETs fabricated in th
e authors' laboratory.