Oral Presentation

Cryogenic Wideband MMIC-LNA development in SHAO

The progress in the development of cryogenic wideband MMIC-LNA’s in SHAO for radio-astronomical receivers will be presented. Three LNAs covering 4-8GHz, 5-10GHz, and 8-20GHz using WIN 0.15µm GaAs pHEMT process have been fabricated. Both room- and cryogenic-temperature measurements show a larger-than-20dB gain within their respective bandwidth; initial testing of their noise performance has also been carried out. A second tape-out using WIN 0.1µm GaAs pHEMT process is scheduled in late 2013 where LNA’s targeting the much-higher K- and Q-bands will be designed. We will then give a brief introduction of the facilities in the SHAO cryogenic receiver lab, in the hope of technical collaboration with other observatories.