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Link to original content: https://doi.org/10.1007/s11071-011-0066-7
On the analysis of bipolar transistor based chaotic circuits: case of a two-stage colpitts oscillator | Nonlinear Dynamics Skip to main content
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On the analysis of bipolar transistor based chaotic circuits: case of a two-stage colpitts oscillator

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Abstract

We perform a systematic analysis of a system consisting of a two-stage Colpitts oscillator. This well-known chaotic oscillator is a modification of the standard Colpitts oscillator obtained by adding an extra transistor and a capacitor to the basic circuit. The two-stage Colpitts oscillator exhibits better spectral characteristics compared to a classical single-stage Colpitts oscillator. This interesting feature is suitable for chaos-based secure communication applications. We derive a smooth mathematical model (i.e., sets of nonlinear ordinary differential equations) to describe the dynamics of the system. The stability of the equilibrium states is carried out and conditions for the occurrence of Hopf bifurcations are obtained. The numerical exploration reveals various bifurcation scenarios including period-doubling and interior crisis transitions to chaos. The connection between the system parameters and various dynamical regimes is established with particular emphasis on the role of both bias (i.e., power supply) and damping on the dynamics of the oscillator. Such an approach is particularly interesting as the results obtained are very useful for design engineers. The real physical implementation (i.e., use of electronic components) of the oscillator is considered to validate the theoretical analysis through several comparisons between experimental and numerical results.

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Authors and Affiliations

  1. Laboratoire d’Automatique et d’Informatique Appliquée (LAIA), Département de Génie Électrique, IUT-Fotso Victor de Bandjoun, Université de Dschang, BP 134, Bandjoun, Cameroun

    J. Kengne & V. A. Fono

  2. Département de Physiques, Faculté des Sciences, Université de Dschang, BP 67, Dschang, Cameroun

    J. C. Chedjou

  3. Transportation Informatics Group, Institute of Smart Systems Technologies, University of Klagenfurt, BP 67, Dschang, Cameroun

    J. C. Chedjou

  4. Transportation Informatics Group, Institute of Smart Systems Technologies, University of Klagenfurt, Universitaetsstr. 65, 9020, Klagenfurt, Austria

    K. Kyamakya

Authors
  1. J. Kengne
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  2. J. C. Chedjou
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  3. V. A. Fono
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  4. K. Kyamakya
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Correspondence to J. Kengne.

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Kengne, J., Chedjou, J.C., Fono, V.A. et al. On the analysis of bipolar transistor based chaotic circuits: case of a two-stage colpitts oscillator. Nonlinear Dyn 67, 1247–1260 (2012). https://doi.org/10.1007/s11071-011-0066-7

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  • DOI: https://doi.org/10.1007/s11071-011-0066-7

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