Design of Cryogenic CMOS LNAs for Space Communications

Abstract

This manuscript presents the 45nm CMOS Low Noise Amplifier (LNA) designed for cryogenic use in spaces. A revised approach has been adopted to classical LNA architecture. External discreet components were added to the LNA in such a way that the LNA S11 and S22 were under -10dB from 70K to 290K at 2.44GHz designated for spatial communications. The LNAs IIP3 performance was analyzed, in particular at cryogenic temperatures, and linearity improvements were demonstrated by using the proposed approach. Although the LNA was not specifically hardened by radiation, no degradation was observed in its performance. Results analysis present that LNA achieves input and output impedance matching's of -24.024 and -23.131dB, NFs of 0.9dB, power gain of 26.7dB, P-1dB of -10.63dBm, IIP3 of -10.6dBm at 2.44GHz, respectively.