Quiet sigma delta quantization, and global convergence for a class of asymmetric piecewise affine maps

Details Quiet sigma delta quantization, and global convergence for a class of asymmetric piecewise affine maps Quiet sigma delta quantization, and global convergence for a class of asymmetric piecewise affine maps

2010-01-18

arxiv.org/abs/1001.2955v2

Mathematics

Dynamical Systems

20 pages, 3 figures

Scientific paper

In this paper, we introduce a family of second-order sigma delta quantization schemes for analog-to-digital conversion which are `quiet' : quantization output is guaranteed to fall to zero at the onset of vanishing input. In the process, we prove that the origin is a globally attractive fixed point for the related family of asymmetrically-damped piecewise affine maps. Our proof of convergence is twofold: first, we construct a trapping set using a Lyapunov-type argument; we then take advantage of the asymmetric structure of the maps under consideration to prove convergence to the origin from within this trapping set.

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