Accurate stability prediction of one-bit higher-order delta–sigma modulators for multiple-sinusoidal inputs
Accurate stability prediction of one-bit higher-order delta–sigma modulators for multiple-sinusoidal inputs
- Author(s): J. Lota ; M. Al-Janabi ; I. Kale
- DOI: 10.1049/iet-cds.2011.0194
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- Author(s): J. Lota 1 ; M. Al-Janabi 2 ; I. Kale 2
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View affiliations
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Affiliations:
1: School of Computing, IT and Engineering, University of East London, London, UK
2: Department of Electronic, Communication and Software Engineering, University of Westminster, London, UK
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Affiliations:
1: School of Computing, IT and Engineering, University of East London, London, UK
- Source:
Volume 6, Issue 2,
March 2012,
p.
71 – 78
DOI: 10.1049/iet-cds.2011.0194 , Print ISSN 1751-858X, Online ISSN 1751-8598
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© The Institution of Engineering and Technology
Published
The present approaches on predicting stability of delta–sigma (Δ–Σ) modulators are mostly confined to DC inputs. This poses limitations as practical applications of Δ–Σ modulators involve a wide range of signals other than DC such as multiple-sinusoidal inputs for speech modelling. In this study, a quasi-linear model for Δ–Σ modulators with non-linear feedback control analysis is presented that accurately predicts stability of single-loop one-bit higher-order Δ–Σ modulators for multiple sinusoids. Theoretical values are shown to match closely with the simulation results. The results of this study would significantly speed up the design and evaluation of higher-order single-loop Δ–Σ modulators with increased dynamic ranges for various applications that require multiple-sinusoidal inputs or any general input composed of a finite number of sinusoidal components.
Inspec keywords: delta-sigma modulation; feedback; circuit stability; nonlinear control systems
Other keywords:
Subjects: A/D and D/A convertors; Nonlinear control systems; A/D and D/A convertors
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