INDIAN JOURNAL OF SCIENCE AND TECHNOLOGY RESEARCH ARTICLE OPEN ACCESS Received: 08.06.2021 Accepted: 20.07.2021 Published: 24.08.2021 Citation: Singh PP (2021) A Novel Chaotic System with Wide Spectrum, its Synchronization, Circuit Design and Application to Secure Communication. Indian Journal of Science and Technology 14(28): 2351-2367. https://doi.org/ 10.17485/IJST/v14i28.1035 ∗ Corresponding author. piyushpratapsingh@gmail.com Funding: TEQIP-III Minor Research Grant, National Institute of Technology Meghalaya, India. Sanctioned Project Ref. No. NITMGH/TEQIP-III/MP/2019-20/269 Competing Interests: None Copyright: © 2021 Singh. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Published By Indian Society for Education and Environment (iSee) ISSN Print: 0974-6846 Electronic: 0974-5645 A Novel Chaotic System with Wide Spectrum, its Synchronization, Circuit Design and Application to Secure Communication Piyush Pratap Singh 1∗ 1 Department of Electrical Engineering, NIT Meghalaya, Laitumkhrah, Shillong, 793003, Meghalaya, India Abstract Objective: To investigate a novel chaotic system with unique features, its synchronization using nonlinear active control, analog circuit design and application to secure communication. Methods/Analysis: Dynamical tools such as dissipative analysis, instability of equilibrium points, sensitivity to initial conditions, 0-1 test, recurrence plot, Poincare map, Lyapunov exponents, Lyapunov dimension, frequency spectrum and basin of attraction. Synchronization is achieved using modified nonlinear active control technique and analog circuit design, implementation is done in NI Multisim platform. MATLAB and Multisim results are presented to meet the adequate verification of theoretical approach. Findings: A three-dimensional chaotic system with only two nonlinear terms, three parameters and a total of eight terms are proposed. The proposed system has three saddle focus type equilibria. The proposed system is topologically different from Lorenz’s and Rossler’s, Lu’s, Chen’s, and Liu’s families. Such dynamic systems are very few in the literature as per authors best knowledge. The system has basin of chaotic attractors for which first Lyapunov exponent ranges between 2.5 to 3. Frequency spectrum and large positive Lyapunov exponent result comparatively large bandwidth of the proposed systems against some well-known chaotic systems. Chaos, periodic and stable behaviors are obtained by altering the system parameters. Novelty/Application: The proposed three-dimensional chaotic system has significant chaotic behavior and broader spectrum than the six chaotic systems like Lorenz, Rossler, Lu, Chen, BG and Liu systems. Unlike the conventional active control approach, the proposed nonlinear active control does not result decoupled error dynamics. The system has significantly large bandwidth which is helpful in the masking of message signals and enhances the security of transmitted signals during communication. Keywords: Analog circuit design; Chaos; Chaotic system; Chaosbased communication; Chaos synchronization; Nonlinear active control https://www.indjst.org/ 2351