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On the modeling and the stability of continuous-time ΣΔ-Modulators

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2 Author(s)
Anders, J. ; Fac. of Electr. Eng. & Comput. Sci., Leibniz Univ., Hannover ; Mathis, W.

In this paper an exact state equivalency including the input signal between continuous-time (CT) ΣΔ modulators and their discrete-time (DT) counterparts is derived. The equivalency is then generalized to include the very important non-ideal effect of excess loop-delay, that plays a crucial role in continuous-time modulators. With this new state-space equivalency, an efficient tool for stability analysis based on continuous-time describing functions is introduced. In the end, it is explained how these findings can be used for a MATLAB toolbox for continuous-time modulators that complements the well-known Schreier-toolbox for discrete-time modulators.

Published in:

Circuits and Systems, 2007. ISCAS 2007. IEEE International Symposium on

Date of Conference:

27-30 May 2007

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