Exponentially tapered Josephson flux-flow oscillator
A. Benabdallah, J. G. Caputo, A. C. Scott
DOI 10.1103/PhysRevB.54.16139 · Physical Review B
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Abstract
We introduce an exponentially tapered Josephson flux-flow oscillator that is tuned by applying a bias current to the larger end of the junction. Numerical and analytical studies show that above a threshold level of bias current the static solution becomes unstable and gives rise to a train of fluxons moving toward the unbiased smaller end, as in the standard flux-flow oscillator. An exponentially shaped junction provides several advantages over a rectangular junction including: (i) smaller linewidth, (ii) increased output power, (iii) no trapped flux because of the type of current injection, and (iv) better impedance matching to a load. © 1996 The American Physical Society.
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