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Delta-Sigma Modulator Structure and limit Cycle Generation  

Hyun, Deok-Hwan (Dept. of Comp. & Information System Engineering Gyeongju University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.43, no.1, 2006 , pp. 39-44 More about this Journal
Abstract
Pattern noise in the Delta-Sigma modulator is a well Known phenomenon that intrigued many circuit designers. These noise appear as the modulator output falls into a cyclic mode of operation. This paper addresses the dependence of these tone signal upon the system topologies. Among the four well known single-stage DSM topologies, namely Cascade of Integrators with Feedback Form(CIFB), Cascade of Integrators with Feedforward Form(CIFF), Cascade of Resonators with Feedback Form(CRFB), and Cascade of Resonators with Feedforward Form(CRFF), resonator type DSMs turn out to be more susceptible to the pattern noise than the integrator type. Noise transfer functions of the investigated topologies are also presented.
Keywords
delta-sigma modulator; limit cycle; pattern noise; characteristic noise; noise transfer function;
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