期刊
COMPLEXITY
卷 2020, 期 -, 页码 -出版社
WILEY-HINDAWI
DOI: 10.1155/2020/5212601
关键词
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资金
- National Natural Science Foundation of China [61504013, 61702052, 61772087, 61674054, 61801054]
- Natural Science Foundation of Hunan Province [2019JJ50648, 2016jj2005, 2017JJ2049, 2017JJ3254]
- Scientific Research Foundation of Hunan Provincial Education Department [18A137, 16B212, 17C0048]
- National Key Research and Development Project [2018YFE0111200]
In this paper, a multistable modified fourth-order autonomous Chua's chaotic system is investigated. In addition to the dynamic characteristics of the third-order Chua's chaotic system itself, what interests us is that this modified fourth-order autonomous Chua's chaotic system has five different types of coexisting attractors: double-scroll, single band chaotic attractor, period-4 limit cycle, period-2 limit cycle, and period-1 limit cycle. Then, an inductorless modified fourth-order autonomous Chua's chaotic circuit is proposed. The active elements as well as the synthetic inductor employed in this circuit are designed using second-generation current conveyors (CCIIs). The reason for using CCIIs is that they have high conversion rate and operation speed, which enable the circuit to work at a higher frequency range. The Multisim simulations confirm the theoretical estimates of the performance of the proposed circuit. Finally, using RK-4 numerical algorithm of VHDL 32-bit IQ-Math floating-point number format, the inductorless modified fourth-order autonomous Chua's chaotic system is implemented on FPGA for the development of embedded engineering applications based on chaos. The system is simulated and synthesized on Virtex-6 FPGA chip. The maximum operating frequency of modified Chua's chaotic oscillator based on FPGA is 180.180 MHz. This study demonstrates that the hardware-based multistable modified fourth-order autonomous Chua's chaotic system is a very good source of entropy and can be applied to various embedded systems based on chaos, including secure communication, cryptography, and random number generator.
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