OMMIC 70nm-mHEMT LNA Design

Abstract

This paper describes our progress in the design of cryogenic LNAs using OMMIC 70nm mHEMT for the Square Kilometer-Array (SKA) project and the Shanghai 65-Meter radio astronomical telescope. Different LNAs covering the aggregate 1 similar to 40GHz frequency range are designed and measured on-wafer at room temperature, and T-n for the 1 similar to 10, 5 similar to 15, and 10 similar to 40GHz LNAs are 80K, 90K, and 120K, respectively, with the gain all larger than 20dB. One 1 similar to 10GHz LNA chip is then packaged and tested cryogenically, and the noise temperature improvement factor is 6 similar to 8, which is smaller than what can be obtained from the WIN pHEMT. Performance repeatability among different chips has been carried out.