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While the general purpose logic elements of the Field Programmable Gate Array (FPGA) appear to be unlikely candidates for implementing the multiply-intensive operations of digital filtering, the application of Distributed Arithmetic (DA) techniques turns the FPGAinto a worthy contender. Indeed, in some important filter applications the Xilinx 4OOO family of FPGAs offers superior performance over the fastest fixed point DSP microprocessors. A brief description of DA processing is presented to provide some background for the filter design examples that are presented. A simple FIR filter will serve to establish the design concepts, and a two dimensional Sobel edge detector will serve to illustrate the performance capabilities of this approach. IntroductionThe DSP engineer currently has two design choices -the DSP

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