Bifurcation study of sigma-delta modulators - an experimental approach

Nandi, Shuvabrata ; Mukherjee, Rupam ; Banerjee, Soumitro (2003) Bifurcation study of sigma-delta modulators - an experimental approach National Conference on Nonlinear Systems & Dynamics . pp. 353-356.

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Abstract

Sigma-delta modulation is a popular technique for high resolution analog to digital and digital to analog conversion. Conventional A-D and D-A converters are based on the linear multi-bit pulse code modulation (PCM) format. They require high-precision analog circuitry and vulnerable to noise and interference. So industry is moving towards oversampled nonlinear converters, one of which is the sigma-delta modulator. In spite of being cheaper, less power-consuming and operable in the voltage range of battery operated consumer devices, they are susceptible to limit-cycle oscillations, which may produce idle tones absent in the original signal. Operation of sigma-delta modulators in chaotic region has been proposed as a solution. In this paper we are investigating chaotic phenomena (bifurcation aspects) in a first order sigma-delta modulator (a modified version) which uses a simple gain element to control operational region shift from normal to chaotic region of operation.

Item Type:Article
Source:Copyright of this article belongs to National Conference on Nonlinear Systems & Dynamics.
Keywords:Bifurcation Theory; Chaotic Communication; Applications of Nonlinear Dynamics and Chaos
ID Code:81399
Deposited On:06 Feb 2012 04:13
Last Modified:06 Feb 2012 04:13

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