Design of Compensator for Modified Multistage CIC-Based Decimation Filter with Improved Characteristics
Gordana Jovanović Doleček · 2023
This work aims to correct the wide passband in a novel multistage CIC-based decimation filter, recently proposed in the literature, preserving its high aliasing rejection and low complexity. Accordingly, a low complexity compensation filter is proposed, which corrects a high passband droop introduced in the multistage decimation filter due to the increased aliasing rejection. The magnitude characteristic of the compensation filter has a sinusoidal form, and the design parameters are obtained using particle swarm optimization (PSO) and MATLAB. Next, the obtained parameters are presented in an SPT (signed power-of-two) form to get a multiplierless design. The compensated multistage filter is compared with similar filters from the literature.