Journal
PHYSICS LETTERS A
Volume 373, Issue 10, Pages 911-918Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2008.12.068
Keywords
Noise-driven informatics; Analog circuits; Multi-value logic; Bit errors; Energy dissipation
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A new type of deterministic (non-probabilistic) computer logic system inspired by the stochasticity of brain signals is shown. The distinct values are represented by independent stochastic processes: independent voltage (or current) noises. The orthogonality of these processes provides a natural way to construct binary or multi-valued logic circuitry with arbitrary number N of logic values by using analog circuitry. Moreover, the logic values on a single wire can be made a (weighted) superposition of the N distinct logic values. Fuzzy logic is also naturally represented by a two-component superposition within the binary case (N = 2). Error propagation and accumulation are suppressed. Other relevant advantages are reduced energy dissipation and leakage current problems. and robustness against circuit noise and background noises such as 1/f, Johnson, shot and crosstalk noise. Variability problems are also non-existent because the logic value is an AC signal. A similar logic system can be built with orthogonal sinusoidal signals (different frequency or orthogonal phase) however that has an extra 1/N type slowdown compared to the noise-based logic system with increasing number of N furthermore it is less robust against time delay effects than the noise-based counterpart. (C) 2009 Elsevier B.V. All rights reserved.
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