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ISBN: 0818628758The authors present a novel scheme for implementing self-checking circuits in static CMOS. A strongly code disjoint (SCD) built-in current sensor (BICS) is presented. It is used to cover faults whose detection cannot be guaranteed by logic monitoring. A previously fabricated and tested high-speed BICS is examined for its behavior in the presence of faults. Then, a self-exercising mechanism is designed to obtain the SCD property. The integration of this SCD BICS with a self-checking circuit achieves the well-known goal of total self-checking

Flux distributions produced by parabolic and circular cylinder solar concentrators subject to surface slope errors and defocusing are determined. The technique developed traces a set of rays from a point on the absorber back through the concentrator optics to the sun. The solar flux at the absorber point is the sum of the flux associated with each ray. Various models of the solar disk are introduced by weighting the flux associated with each ray as a function of where it strikes the solar disk.

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