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IEICE TRANSACTIONS on Fundamentals

Nonlinear Circuit in Complex Time --Case of Phase-Locked Loops--

Hisa-Aki TANAKA, Shin'ichi OISHI, Kazuo HORIUCHI

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Summary :

We analyze the nonlinear dynamics of PLL from the "complex" singularity structure by introducing the complex time. The most important results which we have obtained in this work are as follow: (1) From the psi-series expansion of the solution, the local behavior in the neighbourhood of a movable singularity is mapped onto an integrable differential equation: the Ricatti equation. (2) From the movable pole of the Ricatti equation, a set of infinitly clustered singularities about a movable singularity is shown to exist for the equation of PLL by the multivalued mapping. The above results are interesting because the clustering and/or the fractal distribution of singularities is known to be a characteristic feature of the non-integrability or chaos. By using the method in this letter, we can present a circumstantial evidence for chaotic dynamics without assuming any small parameters in the equation of PLL.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E76-A No.12 pp.2055-2058
Publication Date
1993/12/25
Publicized
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DOI
Type of Manuscript
Special Section LETTER (Special Section of Letters Selected from the 1993 IEICE Fall Conference)
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