2005 · 33 citations · 2 references
EngineeringComputer EngineeringElectrical EngineeringComputer ArchitectureMicroelectronicsVlsi DesignCmos Circuit DesignDigital Integrated Circuit DesignDigital Signal ProcessingField-programmable Gate Array ArchitecturePhysical DesignVery-large-scale Integration LayoutDigital Filtering ArchitecturesDigital Signal Processing Block ArchitectureFilter OrderFiltersHardware-based FilteringMedian FilteringVlsi Implementation
A useful class of digital filters is the rank order filter, of which the median filter is the most popular. This paper details the NMOS IC design of a 6-bit rank order filter based upon the approach of Fitch, Coyle, and Gallagher. The chip provides for programmable window lengths of 3, 5, 7, and 9; the selection of any element in the rank order; operation in the nonrecursive or recursive modes; and the ability to function in a "ganged" mode so that two or more identical chips can accommodate samples of length seven or eight bits.
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