A 100 GHz Josephson mixer using resistively-shunted Nb tunnel junctions
Abstract
The authors describe preliminary mixer results using resistively shunted Nb/AlOx/Nb tunnel junctions in a 100-GHz waveguide mixer mount. The mixer utilizes robust, lithographically defined devices which have nonhysteretic I-V curves. A receiver temperature of 390 K (DSB) has been obtained with a conversion loss of -6.5 dB. The receiver's behavior agrees qualitatively with the behavior predicted by the resistively shunted junction model. Substantial improvements in performance are expected with the use of better-optimized shunted junctions and numerical simulations suggest that, if devices with higher ICRN (critical-current normal-resistance) products can be obtained. Josephson effect mixers could be competitive with superconductor-insulator-superconductor (SIS) mixers at high frequencies.
Additional Information
© Copyright 1993 IEEE. Reprinted with permission. Research supported by NASA Grant NAGW-107, NASA Code R funding to JPL, and a NASA Graduate Student Researcher Fellowship (R. Schoelkopf). Manuscript received August 24, 1992 We would like to acknowledge the generous use of the facilities at the JPL Microdevices Laboratory, and particularly the assistance of H. G. LeDuc and B. Bumble with device fabrication. We also thank T. Buettgenbach, T. Groesbeck, J. Kooi, and J. Stern for many helpful discussions.Files
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- CaltechAUTHORS:SCHOieeetas93
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2006-09-13Created from EPrint's datestamp field
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