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- Title
Observation of Frequency Up-Conversion Gain in SIS Junctions at W Band.
- Authors
Kozuki, Y.; Uzawa, Y.; Kojima, T.; Shan, W.; Sakai, T.
- Abstract
We have developed a test setup to measure frequency up-conversion gain in superconductor–insulator–superconductor (SIS) junctions at W band (75–110 GHz). A conventional SIS mixer with Nb/AlOx/Nb tunnel junctions was used as a frequency up-converter. An up-converted signal is measured by a room-temperature down-converter system. We observed distinct intermediate frequency responses to signal inputs from a continuous microwave source. The measured single-sideband up-conversion gain in SIS junctions was clearly positive (> 0 dB) with input frequency less than 2 GHz, which was well-calibrated by using an input from the continuous-wave source.
- Subjects
LOW noise amplifiers; MILLIMETER waves; MICROWAVE amplifiers; TUNNELS; MICROWAVES; TUNGSTEN alloys
- Publication
Journal of Low Temperature Physics, 2020, Vol 200, Issue 5/6, p255
- ISSN
0022-2291
- Publication type
Article
- DOI
10.1007/s10909-020-02470-x