Eur. Phys. J. B 76, 49-55 (2010)
https://doi.org/10.1140/epjb/e2010-00180-8

On the dynamics of a single-bit stochastic-resonance memory device

¹ Instituto Tecnológico de Buenos Aires, Av. Eduardo Madero 399, Buenos Aires C1106, ACD, Argentina
² Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Rivadavia 1917, Buenos Aires C1033, AAJ, Argentina
³ Departamento de Física, FCEN, Universidad de Buenos Aires, Intendente Güiraldes 2160, Buenos Aires C1428, EGA, Argentina

Corresponding author: ^a pfierens@itba.edu.ar

Received: 25 February 2010
Revised: 13 May 2010
Published online: 10 June 2010

Abstract

The increasing capacity of modern computers, driven by Moore's Law, is accompanied by smaller noise margins and higher error rates. In this paper we propose a memory device, consisting of a ring of two identical overdamped bistable forward-coupled oscillators, which may serve as a building block in a larger scale solution to this problem. We show that such a system is capable of storing a single bit and its performance improves with the addition of noise. The proposed device can be regarded as asynchronous, in the sense that stored information can be retrieved at any time and, after a certain synchronization time, the probability of erroneous retrieval does not depend on which oscillator is being interrogated. We characterize memory persistence time and show it to be maximized for the same noise range that both minimizes the probability of error and ensures synchronization. We also present experimental results for a hard-wired version of the proposed memory, consisting of a loop of two Schmitt triggers. We show that this device is capable of storing a single bit and does so more efficiently in the presence of noise.