Title :
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
fDate :
10/1/2001 12:00:00 AM
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;
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
