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A CMOS Current-Mode Dynamic Programming Circuit
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DOI：10.1109/TCSI.2010.2052661.png)
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Abstract
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Dynamic programming (DP) is a fundamental algorithm for complex optimization and decision-making in many engineering and biomedical systems. However, conventional DP computation based on digital implementation of the Bellman-Ford recursive algorithm suffers from the curse of dimensionality and substantial iteration delays which hinder utility in real-time applications. Previously, an ordinary differential equation system was proposed that transforms the sequential DP iteration into a continuous-time parallel computational network. Here, the network is realized using a CMOS current-mode analog circuit, which provides a powerful computational platform for power-efficient, compact, and high-speed solution of the Bellman formula. Test results for the fabricated DP optimization chip demonstrate a proof of concept for this solution approach. We also propose an error compensation scheme to minimize the errors attributed to nonideal current sources and device mismatch.
Keywords:
Bellman's equation
continuous-time formulation
current-mode circuit design
dynamic programming
fabrication and testing
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