Analysis of Finite Word Length Effects and Frequency Response in Interpolators for Digital Up-Converters

C. Benavente-Peces, F.J. Ortega-González, and J.M. Pardo-Martín (Spain)

Keywords

Digital upconverter, interpolator, cascaded integrator comb filter, finite word length effects

Abstract

This paper analysis finite word length effects in interpolator stages used in digital up-converters. The effects on classical interpolation filters and the efficient cascaded integrator-comb approaches are analyzed providing with useful data that should help the designer to decide the most appropriate structure depending on the hardware limitations. The discussion is mainly focussed on cascaded integrator-comb interpolators highlighting the main factors that influence its design and the parameters that should be tuned to meet the appropriate performance, analysing the limitations, advantages and drawbacks.

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