Title :
Maximum Sequence Length MASH Digital Delta–Sigma Modulators
Author :
Hosseini, Kaveh ; Kennedy, Michael Peter
Author_Institution :
Univ. Coll. Cork, Cork
Abstract :
This paper presents a modified structure for the first-order digital delta-sigma modulator (DDSM) which yields the maximum sequence length (N) for all constant digital inputs and for all initial conditions. Using this structure, MultistAge noise-SHaping (MASH) DDSMs are developed which, for a constant input, always have a sequence length of Nl regardless of the initial conditions and input value, where N is the sequence length of each stage and l is the number of the first-order stages used in the MASH. The performance is confirmed mathematically, by simulation, and experimentally.
Keywords :
circuit noise; delta-sigma modulation; digital delta-sigma modulator; maximum sequence length; multistage noise-shaping; Digital Delta-Sigma Modulator; Digital delta–sigma modulator (DDSM); Digital to Analog Converters; Fractional-N Frequency Synthesizer; Maximum Sequence Length; Multi Stage Noise Shaping (MASH); digital-to-analog converters (DACs); fractional-${N}$ frequency synthesizer; maximum sequence length; multistage noise shaping (MASH);
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
DOI :
10.1109/TCSI.2007.905653