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Performance of all-NbN superconductive tunnel junctions as mixers at 205 GHzSmall-area (1x1 sq micron) high-current-density NbN-MgO-NbN tunnel junctions with I-V characteristics suitable for high frequency mixers were fabricated. These junctions are integrated with superconducting microstrip lines designed to resonate out the large junction capacitance. The mixer gain and noise performance were studied near 205 GHz as a function of the inductance provided by the microstrip. This has yielded values of junction capacitance of 85 fF/sq microns and magnetic penetration depth of 3800 angstroms. Mixer noise as low as 133 K has been obtained for properly tuned junctions. This is the best noise performance ever reported for an NbN SIS mixer.
Document ID
19910035201
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1016/S0921-4526(90)80887-O
Authors
Mcgrath, W. R. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Leduc, H. G. (JPL Pasadena, CA, United States)
Stern, J. A. (California Institute of Technology Pasadena, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Publication Information
Publication: Physica B
Volume: 165-166
ISSN: 0921-4526
Subject Category
Electronics And Electrical Engineering
Accession Number
91A19824
Distribution Limits
Public
Copyright
Other

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