Design of Two-Stage Nonrecursive Rotated Comb Decimation Filters With Droop Compensation and Multiplierless Architecture
This paper proposes a class of decimation filters with reduced passband signal distortion and improved spurious signal rejection across the folding bands. These filters are well-suited to decimation of oversampled digital signals processed by wideband digital receivers and ΣΔ AD converters. The total decimation factor is split between two stages of decimation and zero rotation in a nonrecursive form is applied at the lower rate in order to reduce the computational complexity of the proposed filters. We also address a framework to implement multiplierless filters and to compensate for the passband droop introduced by this class of filters. For increased flexibility, we generalize the transfer function by allowing different orders between the two stages of decimation. The paper presents many examples to clearly describe the design procedure. Comparisons are also given with the goal of contrasting the magnitude responses of the proposed filters with the ones of three other techniques recently proposed in the literature, as well as with classical comb filters.
Journal of the Franklin Institute
Laddomada, Massimiliano and Jovanovic Dolecek, G., "Design of Two-Stage Nonrecursive Rotated Comb Decimation Filters With Droop Compensation and Multiplierless Architecture" (2015). Institute of Technology Publications. 154.