Flexible down-sampling using CIC filter with non-integer delay

Author

Babic, Djordje ; Renfors, Markku

Author_Institution

Inst. of Commun. Eng., Tampere Univ. of Technol., Finland

Volume

2

fYear

2002

fDate

2002

Abstract

In this paper we present an efficient structure for flexible downsampling in multistandard radio receivers. It is based on Cascaded Integrator-Comb (CIC) filter that has very efficient implementation structure without multipliers. By using non-integer delay in the feed-forward branch of comb stage and polynomial interpolation filter between integrator and comb stages of CIC we achieve improved attenuation for the aliasing frequency components. The fractional delay that is placed in feed-forward branch of comb stage introduces some extra requirements for design and implementation. The main advantages of the proposed structure are flexibility and programmability

Keywords

cascade networks; comb filters; delays; digital filters; feedforward; integrating circuits; interpolation; CIC filter; aliasing frequency components; cascaded integrator-comb filter; comb stage; feedforward branch; flexibility; flexible down-sampling; fractional delay; multistandard radio receivers; noninteger delay; polynomial interpolation filter; programmability; Attenuation; Delay; Digital filters; Feedforward systems; Frequency response; Hardware; Interpolation; Polynomials; Receivers; Sampling methods;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on

Conference_Location

Phoenix-Scottsdale, AZ

Print_ISBN

0-7803-7448-7

Type

conf

DOI

10.1109/ISCAS.2002.1010980

Filename

1010980