Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988itmtt..36..552p&link_type=abstract
IEEE Transactions on Microwave Theory and Techniques (ISSN 0018-9480), vol. 36, March 1988, p. 552-560.
Astronomy and Astrophysics
Astronomy
15
Cryogenic Temperature, Electrical Properties, Field Effect Transistors, High Electron Mobility Transistors, Low Noise, Microwave Amplifiers, Computer Aided Design, Gallium Arsenides, Noise Temperature, Radio Astronomy, Transconductance, Volt-Ampere Characteristics
Scientific paper
Typical DC characteristics and X-band noise parameters are presented and qualitatively correlated wherever possible with other technological or experimental data. While certain general trends can be identified, further work is needed to explain a number of observed phenomena. A design technique for cryogenically cooled amplifiers is briefly discussed, and examples of realization of L-band, C-band, X-band, and K-band amplifiers are described. The noise temperature of amplifiers with HEMTs in input stages is usually less than half of that for all-FET realizations, setting new records of performance for cryogenically cooled, multistage amplifiers.
Harris Ronald
Norrod Roger D.
Pospieszalski Marian W.
Weinreb Sander
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