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Performance limits of the Josephson junction microwave receivers

1981; IEEE Magnetics Society; Volume: 17; Issue: 1 Linguagem: Inglês

10.1109/tmag.1981.1061122

1941-0069

V. P. Zavaleev, Konstantin K. Likharev,

Photonic and Optical Devices

The performance limits are found for the Josephson junction microwave receivers: self- and externally-pumped mixers, as well as self-selecting and wideband quadratic detectors. The effect of the signal source impedance upon the Josephson junction properties is considered in two extreme approximations for the junc-, tion matching with the source, the approximations yielding close results. It has become possible to find the device characteristics for the arbitrary values of ratios R E /R N and F/F c , where R E is the reduced source resistance, R N is the junction normal resistance, F is the signal frequency and F C is the junction characteristic frequency. The performance factors obtained are optimized and their ultimate limits are found. The relatively poorly-developed devices without external pumping (self-pumped mixer and self-selecting detector) occur to have the best performance limits. Achievement of these limits is possible, however, only if the recently proposed specially-designed multi-junction arrays are used.