Efficient polyphase decomposition of comb decimation filters in Σ▵ analog-to-digital converters

Author

Aboushady, Hassan ; Dumonteix, Yannick ; Louërat, Marie-Minerve ; Mehrez, Habib

Author_Institution

ASIM/LIP6 Lab., Paris VI Univ., France

Volume

48

Issue

10

fYear

2001

fDate

10/1/2001 12:00:00 AM

Firstpage

898

Lastpage

903

Abstract

A power efficient multirate multistage Comb decimation filter for mono-bit and multi-bit Σ▵ A/D converters is presented. Polyphase decomposition in all stages, with high decimation factor in the first stage, is used to significantly reduce the sampling frequency of the Comb filter. Several implementations indicate that proper choice of the first stage decimation factor can considerably improve power consumption, area and maximum sampling frequency. In multibit Σ▵ A/Ds, this optimum first stage decimation factor is a function of the input wordlength

Keywords

FIR filters; IIR filters; comb filters; sigma-delta modulation; IIR-FIR implementation; comb decimation filters; efficient polyphase decomposition; high decimation factor; input wordlength dependence; mono-bit A/D converters; multi-bit A/D converters; optimum first stage decimation factor; power consumption; power efficient multirate multistage filter; sampling frequency; sigma-delta A/D conversion; transfer function; Analog-digital conversion; Digital signal processing; Energy consumption; Equations; Finite impulse response filter; Frequency; IIR filters; Sampling methods; Signal sampling; Transfer functions;

fLanguage

English

Journal_Title

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/82.974776

Filename

974776