• DocumentCode
    1008941
  • Title

    Accurate noise measurements of superconducting quasiparticle array mixers

  • Author

    McGrath, W. ; Raisanen, Antti ; Richards, P.L. ; Harris, R.E. ; Lloyd, F.L.

  • Author_Institution
    University of California, Berkeley, California
  • Volume
    21
  • Issue
    2
  • fYear
    1985
  • fDate
    3/1/1985 12:00:00 AM
  • Firstpage
    212
  • Lastpage
    215
  • Abstract
    We have constructed a 30-40 GHz test apparatus which allows us to measure the noise temperatures of SIS mixers with an accuracy of better than ±1K. This is a factor of six improvement over earlier measurements. The most accurate measurement made thus far of a mixer which uses a single Pb-alloy junction yielded Tm= 9.2 ± 0.9 K; and mixer gain: Gm= 0.240 ± 0.005. In addition, SIS mixers employing arrays of N = 1, 5, 10, 25, and 50 tunnel junctions in series have been tested. The input power required to saturate the array mixers was found to increase as N2and the gain and noise temperature of the array mixers were independent of N.
  • Keywords
    Josephson device mixers/frequency converters; Measurement noise; Noise measurement; Superconducting transmission lines; Extraterrestrial measurements; Frequency; Gain measurement; Noise measurement; Quantum mechanics; Receivers; Superconducting device noise; Temperature measurement; Testing; Tunneling;
  • fLanguage
    English
  • Journal_Title
    Magnetics, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0018-9464
  • Type

    jour

  • DOI
    10.1109/TMAG.1985.1063708
  • Filename
    1063708
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1008941