Phase locked 270-440 GHz local oscillator based on flux flow in long Josephson tunnel junctions

V.P. Koshelets, S.V. Shitov, L.V. Filippenko, V.L. Vaks, Jesper Mygind, A.B. Baryshev, W. Luinge, N. Whyborn

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The combination of narrow linewidth and wide band tunability makes the Josephson flux flow oscillator (FFO) a perfect on-chip local oscillator for integrated sub-mm wave receivers for, e.g., spectral radio astronomy. The feasibility of phase locking the FFO to an external reference oscillator is demonstrated experimentally. A FFO linewidth as low as 1 Hz (determined by the resolution bandwidth of the spectrum analyzer) has been measured in the frequency range 270–440 GHz relative to a reference oscillator. This linewidth is far below the fundamental level given by shot and thermal noise of the free-running tunnel junction. The results of residual FFO phase noise measurements are also presented. Finally, we propose a single-chip fully superconductive receiver with two superconductor–insulator–superconductor mixers and an integrated phase-locked loop. ©2000 American Institute of Physics.
Original languageEnglish
JournalReview of Scientific Instruments
Issue number1
Pages (from-to)289-293
Publication statusPublished - 2000

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Copyright (2000) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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