Analog VLSI Implementation of Neural Systems by Christopher R. Carroll (auth.), Carver Mead, Mohammed Ismail

By Christopher R. Carroll (auth.), Carver Mead, Mohammed Ismail (eds.)

This quantity comprises the complaints of a workshop on Analog built-in Neural platforms held may possibly eight, 1989, in reference to the overseas Symposium on Circuits and structures. The shows have been selected to surround the full variety of issues at the moment below learn during this fascinating new self-discipline. Stringent attractiveness specifications have been put on contributions: (1) each one description was once required to incorporate specific characterization of a operating chip, and (2) every one layout used to be to not were released formerly. in different circumstances, the prestige of the venture used to be no longer recognized till a couple of weeks sooner than the assembly date. for this reason, the most contemporary cutting edge paintings within the box was once offered. simply because this self-discipline is evolving speedily, each one undertaking is especially a lot a piece in growth. Authors have been requested to dedicate significant realization to the shortcomings in their designs, in addition to to the extraordinary successes they accomplished. during this manner, different employees can now steer clear of stumbling into a similar traps, and evolution can continue extra speedily (and much less painfully). The chapters during this quantity are awarded within the related order because the corresponding displays on the workshop. the 1st chapters are desirous about fmding ideas to advanced optimization difficulties below a predefmed set of constraints. the 1st bankruptcy studies what's, to the easiest of our wisdom, the 1st neural-chip layout. In each one case, the physics of the underlying digital medium is used to symbolize a price functionality in a average means, utilizing in simple terms nearest-neighbor connectivity.

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Each cell i is driven by the sum of one input Ej and output Sj of all the other cells, each weighted by a negative factor -Cij (synaptic weight). 59 The value of Cij is adaptable by means of a local law (which only depends on the values of Si and S} implemented by the nonlinear adaptation block B. Thesis of CJutten [3], which has provided most of the theoretical matenal used here. This paper will describe an experimental CMOS analog implementation of one cell. 3.

Reasonable performance may be obtained by using a single setting of the fuse control voltages and keeping the voltages constant over time. This static approximation of the continuation method will still smooth small step edges while preserving large steps. However, medium steps, such as those simulated in Fig. 11, can be either smoothed or segmented depending upon the temporal history of the network. This load-line analysis is a simplified version of the true dynamics of networks of fuse elements, but serves to illustrate the complexity of even a single fuse element circuit.

E. L. (1981). From Images to Surfaces. Cambridge, MA: MIT Press. Harris, J. G. (1989). An analog VLSI chip for thin plate surface interpolation. In Neural Information Processing Systems, ed. D. Touretzky. Palo Alto: Morgan Kaufmann. Harris, J. G. and Koch, C. (1989). Resistive fuses: circuit implementations of line discontinuities in vision. Snowbird Neural Network Workshop, April 4-7. 54 Harris, J. , Luo, J. and Wyatt, J. (1989). Analog hardware for detecting discontinuities in early vision: computational justification and VLSI circuits, in preparation.

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