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VLSI Implementation of Lattice Wave Digital Filters Using Fixed Point Arithmetic for Increased Maximum Sampling Frequency

Meenakshi A and Tarun KR

VLSI Implementation of Lattice Wave Digital Filters Using Fixed Point Arithmetic for Increased Maximum Sampling Frequency

Low complexity and high speed are the key requirements of the digital filters. These filters can be realized using all-pass sections. In this paper, design and minimum hardware implementation of a fixed point lattice wave digital filter based on three port series adaptor is proposed. Here, the second-order all-pass sections are replaced with three port series adaptors. A design-level area optimization is done by converting constant multipliers into shifts and adds using canonical signed digit (CSD) techniques. The proposed implementation reduces the latency of the critical loop by reducing the number of components (adders and multipliers).