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Understanding Delta-Sigma Data Converters
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TLDR
This chapter discusses the design and simulation of delta-sigma modulator systems, and some of the considerations for implementation considerations for [Delta][Sigma] ADCs.Abstract:
Chapter 1: Introduction.Chapter 2: The first-order delta-sigma modulator.Chapter 3: The second-order delta-sigma modulator.Chapter 4: Higher-order delta-sigma modulation.Chapter 5: Bandpass and quadrature delta-sigma modulation.Chapter 6: Implementation considerations for [Delta][Sigma] ADCs.Chapter 7: Delta-sigma DACs.Chapter 8: High-level design and simulation.Chapter 9: Example modulator systems.Appendix A: Spectral estimation.Appendix B: The delta-sigma toolbox.Appendix C: Noise in switched-capacitor delta-sigma data converters.read more
Citations
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Proceedings ArticleDOI
Interpolation filter design for hearing-aid audio class-D output stage application
TL;DR: Proposed design simplifications presented here result in the least hardware demanding combination of oversampling ratio, number of stages and number of filter taps among a number of filters reported for audio applications.
Journal ArticleDOI
Modified polar sigma-delta transmitter for multiradio applications
Martha Liliana Suarez Penaloza,Vaclav Valenta,Genevieve Baudoin,Martine Villegas,Roman Marsalek +4 more
TL;DR: The overall concept of the polar transmitter is presented here along with novel modifications and improvements, and it is suggested to replace the analog mixing by a digital mixing when recombining the envelope and the phase signals.
Patent
Signal decimation techniques
TL;DR: In this article, the first periodic signal is divided by a configurable integer ratio divider, and the output of the divider is delayed by configurable fractional delay, which may be noise-shaped using, e.g., sigma-delta modulation techniques to spread the quantization noise over a wide bandwidth.
Proceedings ArticleDOI
The synthesis of noise transfer functions for bandpass delta-sigma modulators with tunable center frequency
TL;DR: The proposed method allows to create NTFs of arbitrary order by directly placing the zeros and poles on the z-plane by using simple closed form expressions, thus avoiding the need of large lookup tables to store multiple pre-computed coefficient sets.
Journal ArticleDOI
Near-Optimal Decoding of Incremental Delta-Sigma ADC Output
TL;DR: A nonlinear digital decoder (reconstruction filter) for incremental delta-sigma modulators that utilizes both the magnitude and pattern information of the modulator output to achieve accurate input estimation and can improve the converter’s signal-to-quantization noise ratio.
References
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Journal ArticleDOI
A higher order topology for interpolative modulators for oversampling A/D converters
TL;DR: Higher order modulators are shown not only to greatly reduce oversampling requirements for high-resolution conversion applications, but also to randomize the quantization noise, avoiding the need for dithering.
Journal ArticleDOI
Decimation for Sigma Delta Modulation
TL;DR: It is shown that digital filters comprising cascades of integrate-and-dump functions can match the structure of the noise from sigma delta modulation to provide decimation with negligible loss of signal-to-noise ratio.
Journal ArticleDOI
An analysis of nonlinear behavior in delta - sigma modulators
Sasan H. Ardalan,J.J. Paulos +1 more
TL;DR: This paper introduces a new method of analysis for deltasigma modulators based on modeling the nonlinear quantizer with a linearized gain, obtained by minimizing a mean-square-error criterion, followed by an additive noise source representing distortion components.
Book ChapterDOI
The Structure of Quantization Noise from Sigma-Delta Modulation
James C. Candy,O. Benjamin +1 more
TL;DR: Simple algebraic expressions for this modulation noise and its spectrum in terms of the input amplitude are derived and can be useful for designing oversampled analog to digital converters that use sigma-delta modulation for the primary conversion.
Journal ArticleDOI
A fourth-order bandpass sigma-delta modulator
TL;DR: The modulator of a bandpass analog/digital (A/D) converter, with 63 dB signal/noise for broadcast AM bandwidth signals centered at 455 kHz, has been implemented by modifying a commercial digital-audio sigma-delta ( Sigma Delta ) converter.