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Title
Japanese: 
English:Current-starved cross-coupled CMOS inverter rings as versatile generators of chaotic and neural-like dynamics over multiple frequency decades 
Author
Japanese: MINATILUDOVICO, Frasca Mattia, 吉村奈津江, Ricci Leonardo, Oświecimka Paweł, 小池康晴, 益一哉, 伊藤浩之.  
English: Ludovico Minati, Mattia Frasca, Natsue Yoshimura, Leonardo Ricci, Paweł Oświecimka, Yasuharu Koike, Kazuya Masu, Hiroyuki Ito.  
Language English 
Journal/Book name
Japanese: 
English:IEEE Access 
Volume, Number, Page Vol. 7        pp. 54638 - 54657
Published date Apr. 23, 2019 
Publisher
Japanese: 
English:IEEE 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://ieeexplore.ieee.org/document/8697094
 
DOI https://doi.org/10.1109/ACCESS.2019.2912903
Abstract The generation of chaotic signals is relevant to a multitude of applications across telecommunications, random number generation, control, and the realization of distributed sensing systems; in addition, networks of coupled chaotic oscillators replicate diverse emergent phenomena occurring in considerably larger biological neural systems. However, to date, the generation of chaotic signals by means of complementary metal-oxide-silicon (CMOS) integrated circuits has been hampered largely by the need to implement reactive elements, and by limited flexibility. In this paper, we introduce a pure CMOS implementation of a chaos generator based on three inverter rings having lengths equal to the smallest odd prime numbers, i.e., 3, 5, and 7. These rings are cross-coupled via diodes of diverse strengths enabled through pass-gates, and the inverters in the rings are independently current-starved. Through numerical simulations and experiments, it is shown that this new topology can generate chaotic signals over at least four frequency decades. Furthermore, it is demonstrated that the experimental devices have access to a multitude of qualitatively-different dynamical behaviors as a function of the starving currents. In particular, the generation of spiking and bursting signals reminiscent of action potentials are observed, both with and without slower fluctuations which resemble field potentials. Furthermore, instances of oscillation quenching are found, wherein the circuit acts as a nonlinear amplifier yielding 1/ ${f}$ -like stochastic signals. This compact and flexible topology promises to become a foundational cell in the design of integrated circuits requiring area-efficient, low-power, and controllable chaos generation.

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