W-band high efficiency InP-based power HEMT with 600 GHz fmax

We have developed 0.1-μm gate-length InAlAs-InGaAs-InP power HEMT's with record efficiency and power gain at 94 GHz. A 200 μm gate-width device has produced 58 mW output power with 6.4 dB power gain and 33% power-added efficiency. The extrapolated f
_max
of 600 GHz is the highest reported to date for any transistor, and smaller, 30-μm devices fabricated on the same wafer exhibit excellent noise figure (1.4 dB at 94 GHz), demonstrating the applicability of this technology to multifunction MMICs.