Arrays of superconducting tunnel junctions as low-noise 10-GHz mixers
- 15 May 1979
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 34 (10) , 711-713
- https://doi.org/10.1063/1.90615
Abstract
Quasiparticle mixing (biasing at the gap voltage) was studied in arrays of small Pb‐O‐Pb tunnel junctions. Coherent mixing at 9 GHz gave a conversion loss as low as −5.8 dB and a single sideband mixer noise temperature of 10–40 K. The optimal conversion efficiency was obtained where the bias current microwave response was maximal. The arrays of junctions were rugged, and gave a good impedance match to external circuitry.Keywords
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