Comparison of IIR filter structure complexities using multiplier blocks
Andrew Graham Dempster, M.D. Macleod · 2002
This paper is concerned with low complexity (e.g. IC area or gate count) implementation of fixed-point IIR digital filters. Low-sensitivity structures, such as wave structures, require smaller fixed-point wordlengths. For this reason, they have been proposed for minimizing filter complexity. However, filter coefficient multipliers can be implemented using multiplier blocks. Traditional structures, such as the direct form, benefit greatly from the use of multiplier blocks, and a statistical study is reported showing that they then become comparable to (or better than) wave structures in complexity. The cascade structure is found to be the most efficient.