Spectrum of oscillation of the array of Josephson junctions in the coplanar line
F.V. Khan1,2, L.V. Filippenko 1, M.Yu. Fominsky1, A.B. Ermakov1, A.P. Orlov 1, V.P. Koshelets1
1Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, Russia
2Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Moscow Region, Russia
Email: khanfv@hitech.cplire.ru
We have studied spectral characteristics of radiation of an oscillator based on the array of Josephson junctions and evaluated its applicability as a heterodyne included in the superconducting integrated receiver. The array is 350 serial junctions that are embedded into a central electrode of the coplanar line. Radiation from the array is mixed with higher synthesizer harmonics (the frequency is 16-19 GHz) that originate in a single tunnel Josephson junction (a harmonic mixer). A signal at the difference frequency (up to 800 MHz) is output to a commercial spectrum analyzer. A natural width of the oscillation line in the best point was below 1 MHz with the signal-to-noise ration of 26.3 dB. The estimates of the line width within the model that takes into account noises of Josephson junctions as well as thermal and low-frequency noises are in qualitative agreement with experimental results. Besides, we were the first to implement a phase-locked loop mode to the stable external synthesizer in all the points, where the line width does not exceed 15 MHz. Keywords: superconducting integrated receiver, heterodyne, Josephson junction, coplanar line, noises, phase-locked loop.
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