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Electronics 2018, 7(10), 252; https://doi.org/10.3390/electronics7100252

PVT-Robust CMOS Programmable Chaotic Oscillator: Synchronization of Two 7-Scroll Attractors

1
Department of Electronics, Universidad Autónoma de Tlaxcala, Apizaco Tlaxcala 90300, Mexico
2
Faculty of Electronic Sciences, Benemérita Universidad Autónoma de Puebla, Puebla 72570, Mexico
3
Department of Electronics, INAOE, Puebla 72840, Mexico
4
Instituto de Microelectrónica de Sevilla, CSIC and Universidad de Sevilla, 41092 Sevilla, Spain
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 28 September 2018 / Revised: 9 October 2018 / Accepted: 12 October 2018 / Published: 16 October 2018
(This article belongs to the Section Systems & Control Engineering)
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Abstract

Designing chaotic oscillators using complementary metal-oxide-semiconductor (CMOS) integrated circuit technology for generating multi-scroll attractors has been a challenge. That way, we introduce a current-mode piecewise-linear (PWL) function based on CMOS cells that allow programmable generation of 2–7-scroll chaotic attractors. The mathematical model of the chaotic oscillator designed herein has four coefficients and a PWL function, which can be varied to provide a high value of the maximum Lyapunov exponent. The coefficients are implemented electronically by designing operational transconductance amplifiers that allow programmability of their transconductances. Design simulations of the chaotic oscillator are provided for the 0.35 μ m CMOS technology. Post-layout and process–voltage–temperature (PVT) variation simulations demonstrate robustness of the multi-scroll chaotic attractors. Finally, we highlight the synchronization of two seven-scroll attractors in a master–slave topology by generalized Hamiltonian forms and observer approach. Simulation results show that the synchronized CMOS chaotic oscillators are robust to PVT variations and are suitable for chaotic secure communication applications. View Full-Text
Keywords: chaos; current-mirror; current-mode; MOS transistor; PWL function; operational transconductance amplifier; programmability; master–slave synchronization; PVT variations chaos; current-mirror; current-mode; MOS transistor; PWL function; operational transconductance amplifier; programmability; master–slave synchronization; PVT variations
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Carbajal-Gomez, V.H.; Tlelo-Cuautle, E.; Sanchez-Lopez, C.; Fernandez-Fernandez, F.V. PVT-Robust CMOS Programmable Chaotic Oscillator: Synchronization of Two 7-Scroll Attractors. Electronics 2018, 7, 252.

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