Authors: Sai Venkatesh Balasubramanian
A frequency dependant chaos generator offering the twin advantages of simplicity of implementation and easy control and tunability is proposed using an iterative map based on the circle map and characterized using bifurcation diagrams. The nonlinearity of a single MOS transistor is effectively harnessed and is used to design a frequency dependant chaos generator using ring oscillators for the driving signals. The proposed design is implemented at the deep submicron VLSI level at 180nm CMOS Technology using SPICE Simulation. The generated chaos is characterized qualitatively using waveforms, spectra and phase portrait. Quantitative characterization using Lyapunov Exponent, Kolmogorov Entropy and Fractal Dimension ascertain the chaotic nature. Finally, the dependance of the nature of chaos generated on the power supply and on the driving signal frequency is characterized. The simplicity of circuitry coupled with the frequency dependence and low power dissipation form the key highlights of the present work. The chaotic signal generated in the present work serve as a potential candidate as a carrier in secure communication systems and encryption techniques.
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[v1] 2015-10-22 09:44:59
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