Decimadores CIC no recursivos: Diseño e Implementación

This thesis presents design and implementation of non-recursive CIC decimation filters, with low power consumption and incremented attenuation in the first folding band, comparing with the CIC filter. First, it is presented a general review of sampling rate conversion, the characteristics of CIC filter, and a brief review of methods for improving the attenuation in the stopband of CIC filter. Two different designs have been proposed. The first design is a non-recursive CIC decimation filter structure that improves the alias rejection in the first folding band with a slight increase in the complexity and power consumption of the original non-recursive structure. The second design is a non-recursive CIC decimation filter structure that decreases the power consumption satisfying the minimum aliasing attenuation in all folding bands. The brief introduction to the implementation, which is focused on the efficient implementation of non-recursive CIC decimation filter, in both direct and polyphase form is presented. The proposed decimation filters are implemented and simulated in order to verify their proper operations, the power consumption and the area. Finally, the comparisons of CIC filters and the proposed structures are performed in order to present the benefits and the proper designs.