ISSTT Proceedings

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Photon Noise in the SIS Detector

Authors:
Noshir S. Dubash, Gordana Pance, Michael J. Wengler
Abstract:
The dominant source of noise in an SIS mixer is the noise in the photon-induced dc current. We have made accurate measurements of noise induced in SIS junctions by 95 GHz photons. The noise in the dc current was measured at 1.5 GHz using a low-noise cryogenic measurement system. Noise measurements have been made on single Nb/A10x/Nb junctions which are poorly coupled to the radiation due to their large parasitic capacitance. Noise in these SIS's is nearly perfectly predicted by Tucker's theory augmented by a vacuum/thermal noise term. Measurements of series arrays of these junctions also agree with this theory showing that the noise of each SIS in the array is independent. We have also measured SIS's which are well coupled to the radiation because of integrated tuning structures. The photon induced noise in these SIS' s deviated significantly from theoretical predictions. We do not yet have an explanation or an alternate theory for this case.
Categories:
SIS Receivers
Year:
1993
Session:
1
Full-text:
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Page Number(s):
19-32