Qualitative models and experimental investigation of chaotic NOR gates and set/reset flip-flops

Aminur Rahman, Ian Jordan, Denis Blackmore

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


It has been observed through experiments and SPICE simulations that logical circuits based upon Chua’s circuit exhibit complex dynamical behaviour. This behaviour can be used to design analogues of more complex logic families and some properties can be exploited for electronics applications. Some of these circuits have been modelled as systems of ordinary differential equations. However, as the number of components in newer circuits increases so does the complexity. This renders continuous dynamical systems models impractical and necessitates new modelling techniques. In recent years, some discrete dynamical models have been developed using various simplifying assumptions. To create a robust modelling framework for chaotic logical circuits, we developed both deterministic and stochastic discrete dynamical models, which exploit the natural recurrence behaviour, for two chaotic NOR gates and a chaotic set/reset flip-flop. This work presents a complete applied mathematical investigation of logical circuits. Experiments on our own designs of the above circuits are modelled and the models are rigorously analysed and simulated showing surprisingly close qualitative agreement with the experiments. Furthermore, the models are designed to accommodate dynamics of similarly designed circuits. This will allow researchers to develop ever more complex chaotic logical circuits with a simple modelling framework.

Original languageEnglish (US)
Article number20170111
JournalProceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Issue number2209
StatePublished - 2018

All Science Journal Classification (ASJC) codes

  • General Mathematics
  • General Engineering
  • General Physics and Astronomy


  • Chaos
  • NOR gate
  • Set/reset flip-flop circuit
  • Stochastic dynamical system


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