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77-30569/307193 Analysis of sigma-delta modulator
Engineering Education # 01, January 2012
A sigma-delta modulator with negative feedback was considered in this article. The structure and working principles of devices built on the basis of sigma-delta modulation were presented. Application areas of the sigma-delta modulators were explored. Mathematical models of the sigma-delta modulator’s operation in the time domain were described. Analysis of operation of the sigma-delta modulator of the first and the second orders was also presented in the article. It was determined that a noise band appeared in the sigma-delta modulator because modulator was a chaotic attractor. Sigma-delta modulator’s ability to form the frequency fractionality in output spectrum was also indicated. Mathematical models without additive noise were considered; the conclusion on the influence of the modulator’s order on the noise level. The graphics, which displayed basic characteristics of sigma-delta modulator’s operation with different inputs were included.
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