F. Diette et al., 1510MS MM 0.1-MU-M GATE LENGTH PSEUDOMORPHIC HEMTS WITH INTRINSIC CURRENT GAIN CUTOFF FREQUENCY OF 220GHZ/, Electronics Letters, 32(9), 1996, pp. 848-850
The state of the art for a planar doped pseudomorphic Al0.2Ga0.8As/In0
.2Ga0.8As HEMT with a gate length of 0.1 mu m is presented. The device
s exhibit an extrinsic and intrinsic transconductance of 1070 and 1510
mS/mm, respectively, a maximum current density of 550 mA/mm and a pea
k current gain cutoff frequency of 220 GHz. These results are the high
est ever reported for HEMTs fabricated on GaAs substrates.