FPGA implementation, controls and synchronization of autonomous Josephson junction jerk oscillator

• Published in: Physica scripta Vol. 98; no. 3; pp. 35224 - 35236
• Main Authors: Dongmo, Eric Donald, Ramadoss, Janarthanan, Tchamda, André Rodrigue, Sone, Michael Ekonde, Rajagopal, Karthikeyan
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.03.2023
• Subjects: bistability; controls of chaotic and coexisting attractors; difference synchronization; FPGA implementation; Josephson junction jerk oscillator; megastability
• ISSN: 0031-8949; 1402-4896
• DOI: 10.1088/1402-4896/acb85b

Abstract This paper reports the field programmable gate array (FPGA) implementation of an autonomous Josephson junction jerk oscillator (AJJJO) and the investigated coexisting and chaotic attractors besteered, with different synchronization achieved. AJJJO displays bistability, megastability, and coexistence between limit cycle and self-excited chaotic attractors, which is validated by the FPGA implementation. The elimination of chaotic dynamics exhibited by AJJJO was done by using a double single controller via numerical simulations. The coexisting attractors between limit cycle and self-excited chaotic attractors are destroyed and besteered to the wanted path via the linear augmentation control method. Moreover, controllers are employed to achieve the difference synchronization of three identical coupled chaotic AJJJOs resulting from various starting conditions. Finally, numerical simulations of three identical coupled chaotic AJJJOs indicate the effectiveness of the difference synchronization.