Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993itas....3.2230w&link_type=abstract
IEEE Transactions on Applied Superconductivity (ISSN 1051-8223), vol. 3, no. 1, pt. 4, p. 2230-2233.
Astronomy and Astrophysics
Astronomy
Aluminum Oxides, Mixing Circuits, Niobium, Photodiodes, Quantum Efficiency, Sis (Superconductors), Electron Tunneling, Radio Astronomy, Radio Receivers
Scientific paper
The authors describe the characterization and interpretation of the performance of SIS receivers within the framework of the photodiode theory of mixing. The quantum efficiency plays a dominant role in the theory, and a simple method of accurately measuring this parameter is presented. It is demonstrated that the quantum efficiency measurements can be conveniently made on a standard radio astronomy receiver and combined with the usual hot and cold load characterization to improve the understanding of the receiver's performance. The measurements verify that the photodiode theory of mixing accurately describes the receiver noise even at local-oscillator power levels well above the linear response range. The results for receivers operating at 100 and 240 GHz verify the utility of this approach. These methods should also prove useful in evaluating submillimeter receivers.
Wengler Michael J.
Woody David P.
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