ISSTT Proceedings

ISSTT Proceedings

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High Frequency Effects and Performance of a 600 GHz - 635 GHz SIS Receiver Using Nb/AlOx/Nb Junctions

Authors:
M. Salez, P. Febvre, W.R. McGrath, B. Bumble, H.G. LeDuc
Abstract:
A 600 GHz - 635 GHz waveguide SIS heterodyne receiver was built and used for astronomical observations at the Caltech Submillimeter Observatory (CSO) in Hawaii. The mixer employs a 0.25-µm² Nb/A10x/Nb junction integrated with a Nb/SiO/Nb microstrip tuning circuit. The double sideband receiver noise temperature is 245 K - 310 K over the tunable bandwidth. At frequencies approaching the gap frequency of niobium (700 GHz), the optimization of the receiver is limited by the overlap of second-order and first-order photon steps of opposite signs. A noise increase of 10% - 40% is measured when the junction is biased in the region where the photon steps overlap, in agreement with the calculations using Tucker's theory. The bias range yielding the best performance is a small portion of the photon step in the vicinity of the second Shapiro step, which makes the cancellation of the AC Josephson effect with an external magnetic field critical.
Categories:
SIS Receivers
Year:
1994
Session:
1
Full-text:
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Page Number(s):
109-124