150 GHz GaAs amplifiers in a commercial 0.1-μm GaAs PHEMT process

150 GHz amplifiers fabricated on a commercial GaAs process with an f
_T
of 135 GHz are presented. The core design achieves a gain of 10 dB or more from 105 to 150 GHz and the balanced variant has a bandwidth of 100 to 150 GHz and output power above 8 dBm at 140 GHz. Significantly, this coplanar design was carried out with a model extracted from biased S-parameters up to only 50 GHz taken on a microstrip device with different gate width. The measured S-parameters and output power of the amplifiers agree remarkably well with that predicted by the model.