FPGA implementation of high-order FIR filters by requantizing the input data stream

Chris H. Dick; Fred J. Harris

doi:10.1117/12.221337

19 September 1995 FPGA implementation of high-order FIR filters by requantizing the input data stream

Chris H. Dick, Fred J. Harris

Proceedings Volume 2607, Field Programmable Gate Arrays (FPGAs) for Fast Board Development and Reconfigurable Computing; (1995) https://doi.org/10.1117/12.221337
Event: Photonics East '95, 1995, Philadelphia, PA, United States

Abstract

This paper addresses the problem of implementing narrow-band FIR filters using FPGAa. Rather than employing a conventional multiply-accumulate unit to compute the inner-product, an alternative method based on requantization of the input data stream is presented. The requantization process preserves the dynamic range of the signal components contained in the bandwidth of the filter, while shifting the requantization noise to the spectral region to be rejected by the filter. The reduced bit length representation of the requantization input data samples removes the requirement for a full multiplier in the filter hardware. This makes the method very attractive for realization using FPGA technology. The filtering technique is described, and implementation results using a Xilinx XC4010 FPGA are presented.

Citation Download Citation

Chris H. Dick and Fred J. Harris "FPGA implementation of high-order FIR filters by requantizing the input data stream", Proc. SPIE 2607, Field Programmable Gate Arrays (FPGAs) for Fast Board Development and Reconfigurable Computing, (19 September 1995); https://doi.org/10.1117/12.221337

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