Maximum Sequence Length MASH Digital Delta–Sigma Modulators

Maximum Sequence Length MASH Digital Delta–Sigma Modulators
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DOI:
10.1109/tcsi.2007.905653
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发表时间:
2007-12
期刊:
IEEE Transactions on Circuits and Systems I: Regular Papers
影响因子:
--
通讯作者:
K. Hosseini;Michael Peter Kennedy
K. Hosseini;Michael Peter Kennedy
中科院分区:
其他
文献类型:
--
作者:
K. Hosseini;Michael Peter Kennedy

文献摘要

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本文提出了一种一阶数字delta-sigma调制器(DDSM)的改进结构,它能在所有数字输入和所有初始条件下产生最大序列长度(N)。使用这种结构,多阶段噪声整形(MASH)DDSM被开发,对于恒定输入,其总是具有N1的序列长度,而不管初始条件和输入值如何,其中N是每个阶段的序列长度,l是在MASH中使用的一阶阶段的数量。性能在数学上,通过模拟和实验证实。
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.