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Noise Properties of a Mixer with SIS NbN Quasiparticle Tunnel Junctions.

Authors:
A. Karpov, B. Plathner, K.H. Gundlach, M. Aoyagi, S. Takada
Abstract:
We present an analysis of the noise properties of a mixer with the full NbN tunnel junctions. Our work is based on experiment in 120 -180 GHz range with SIS mixer with the NbN-MgO-NbN tunnel junctions. Mixer circuit is totally in NbN. The mixer operates at 5.4 K temperature unacceptable with Nb junctions. Minimum DSB receiver noise temperature is about 65 K at 160 GHz and approaches the Nb SIS mixer performance in mm band. In the whole 50 % band receiver noise varied between 65 and 150 K with the middle value about 80 K. It has been found that noise sources in the NbN junctions are comparable to the Nb junctions and that the receiver noise with the NbN SIS mixer may be only few times more than the quantum limit of noise in the frequency range below the gap frequency. Output noise of the SIS mixer has been found constant in a wide frequency band and within an important range of the local oscillator amplitudes.
Categories:
SIS Receivers
Year:
1995
Session:
2
Full-text:
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Page Number(s):
117-122