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Noise of superconductor/normal metal/superconductor mixer based on low voltage negative differential resistance effect

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2 Author(s)
Gorelov, Y. ; Inst. de Fisica, Univ. Fed. do Rio de Janeiro, Brazil ; Nicolsky, R.

The conversion efficiency was calculated for some type of high-T/sub c/ superconducting junctions, which have negative derivative on current-voltage characteristics. This distinguishing feature can be explained by Andreev reflections in superconductor/normal metal boundaries. In this work it is analyzed a combination of the theoretical predictions of noise, based on noise correlation matrix of the mixer model, and theory of Likharev-Semenov for the thermal noise. The conversion gain is possible in SNS mixers in spite of noise in negative derivative region.

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Applied Superconductivity, IEEE Transactions on  (Volume:9 ,  Issue: 2 )