Title :
Efficient polyphase decomposition of Comb decimation filters in ΣΔ analog-to-digital converters
Author :
Aboushady, H. ; Dumonteix, Y. ; Louerat, M.M. ; Mehrez, H.
Author_Institution :
Lab. LIP6/ASIM, Paris VI Univ., France
Abstract :
A power efficient multi-rate multi-stage Comb decimation filter for mono-bit and multi-bit ΣΔ 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 ΣΔ A/Ds, this optimum first stage decimation factor is function of the input wordlength
Keywords :
comb filters; low-power electronics; sigma-delta modulation; ΣΔ analog-to-digital converter; mono-bit ADC; multi-bit ADC; multi-rate multi-stage comb decimation filter; polyphase decomposition; power consumption; power efficiency; sampling frequency; Acquired immune deficiency syndrome; Analog-digital conversion; Energy consumption; Equations; Finite impulse response filter; Frequency; IIR filters; Sampling methods; Stability; Transfer functions;
Conference_Titel :
Circuits and Systems, 2000. Proceedings of the 43rd IEEE Midwest Symposium on
Conference_Location :
Lansing, MI
Print_ISBN :
0-7803-6475-9
DOI :
10.1109/MWSCAS.2000.951676
