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Hybrid Digital-Analog Circuits Can Increase Computational Power of Chaos-Based Systems

Two iterations of Tent map for superstable initial conditions.

Research at North Carolina State University has found that combining digital and analog components in nonlinear, chaos-based integrated circuits can improve their computational power by enabling processing of a larger number of inputs.

Credit: John F. Lindner

Combining digital and analog elements in nonlinear, chaos-based integrated circuits boosts their computational power by enabling a larger number of inputs to be processed, according to North Carolina State University (NCSU) researchers.

NCSU's Vivek Kohar notes ambient noise can be a major problem for nonlinear systems, so the team developed a hybrid system using a digital block of AND gates and an analog nonlinear circuit to distribute the computation between the digital and analog circuits.

The exponential reduction in computational time enables output measurement while noise-based deviations are still too small to impact accuracy.

The proposed system also couples multiple systems to further enhance accuracy. Kohar says the systems are tuned so "at the time of measurement, our system is at the maxima or minima--the points where the effects of noise are low in general and much lower if the systems are coupled."

From NCSU News
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