Form and width of the spectral line of a Josephson flux-flow oscillator
Andrey L. Pankratov
DOI 10.1103/PhysRevB.65.054504 · Physical Review B
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Abstract
The behavior of a Josephson flux-flow oscillator in the presence of both bias current and magnetic field fluctuations has been studied. To derive the equation for slow phase dynamics in the limit of small noise intensity the Poincare method has been used. Both the form of spectral line and the linewidth of the flux-flow oscillator have been derived analytically on the basis of known frequency modulation theory technique, known limiting cases are considered, limits of their applicability are discussed and appearance of excess noise is explained. Good coincidence of theoretical description with experimental results has been demonstrated.
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