T. Kashiwa et al., AN ULTRA-LOW NOISE 50-GHZ-BAND AMPLIFIER MMIC USING AN ALGAAS INGAAS PSEUDOMORPHIC HEMT/, IEICE transactions on electronics, E78C(3), 1995, pp. 318-321
An ultra low noise 50-GHz-Band amplifier (LNA) MMIC has been developed
using an AlGaAs/InGaAs pseudomorphic HEMT. A noise figure of 1.8 dB w
ith an associated gain of 8.1 dB is achieved at 50 GHz. The noise figu
re is less than 2.0 dB from 50 GHz to 52.5 GHz. This is the state-of-t
he-art noise figure for low noise amplifiers around 50 GHz. The succes
s of this LNA development came from the excellent HEMT and MMIC techno
logies and the accurate modeling of active and passive elements. Good
agreement between measured and simulated data over the band from 40 GH
z to 60 GHz is obtained.