Efficient Polyphase Decomposition of Comb Decimation Filters in DeltaSigma Analog-to-Digital Converters

A power efficient multi-rate multi-stage Combdecimation filter for mono-bit and multi-bit A A/D con-verters is presented. Polyphase decomposition in all stages,with high decimation factor in the first stage, is used tosignificantly reduce the sampling frequency of the Comb filter.Several implementations indicate that proper choice ofthe first stage decimation factor can considerably improvepower consumption, area and maximum sampling frequency.In multibit .A A/Ds, this optimum first...