Title :
A new cascaded modified CIC-cosine decimation filter
Author :
Dolecek, Gordana Jovanovic ; Carmona, Javier Diaz
Author_Institution :
Dept. of Electron., INAOE, Puebla, Mexico
Abstract :
This paper presents a new modified multistage CIC-cosine decimation filter. The original CIC filter is replaced by a multistage structure, where each stage is a cascade of simple CIC filters. The number of cascaded filters can be different for different stages. The first section is realized in nonrecursive form. Using the polyphase decomposition, the subfilters of the first section can be operated at a lower rate which depends on the down-sampling factor of the first section. The magnitude response of this filter is improved by using cosine prefilters which can also be moved to a lower rate. The resulting structure does not have any filtering at the high input rate and has an improved magnitude characteristic.
Keywords :
cascade networks; comb filters; digital filters; integrating circuits; sampling methods; cascaded decimation filter; cosine prefilters; down-sampling factor; magnitude characteristic; modified CIC-cosine filter; multistage decimation filter; polyphase decomposition; subfilters; Filtering; Filters; Frequency; Passband; Power dissipation; Sampling methods; Transfer functions; CIC filter; Cosine prefilter; multistage structure; polyphase decomposition;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1465441