Decimation Lowpass Filters for SIGMA-DELTA Modulators - A Comparative Study

Langue : anglais

Edité par GRIN Verlag Mrz 2011, 2011

3640862651 / 9783640862658

Vendeur : BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, AllemagneBuchWeltWeit Ludwig Meier e.K.

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This item is printed on demand - it takes 3-4 days longer - Neuware -Master's Thesis from the year 1998 in the subject Electrotechnology, grade: 1,0 (A), University of Rhode Island (--), language: English, abstract: The purpose of this thesis is to compare several filter topologies used for the decimation of sigma-delta modulated digital signals. The goal is to present optimized filter architectures with regard to an efficient VLSI implementation. A fifth-order 1-bit sigma-delta modulator using local feedback techniques will be considered as the front-end A/D converter. The subsequent digital filter reduces the sampling rate by a factor of 32. The decimation filter must guarantee a narrow transition band between 0.5 and 0.55 and stopband attenuation of 100dB.Chapter 1 provides a brief introduction into the principles of digital signal processing. The considerations are focused on FIR filters due to the requirements for acoustic applications. Chapter 2 illustrates the proposed overall structure and the design flow.The objective of chapter 3 is to present the principles of oversampling data converters using sigma-delta techniques. The 5V fifth-order SigmaDelta-modulator with 90dB dynamic range (SNR+THD) will be presented, which has been fabricated in 1.2$um CMOS technology. For the sake of simplicity and robustness, a 1-bit quantizer will be used.Chapter 4 deals with typical hardware realizations of digital filters. Apart from the ``brute force'' implementation of the multirate filter with identical filters running in parallel, also the LUT-based approach for small filter orders will be presented. Due to the advantages of compact implementation, the bit-serial approach and the bit-serial multiplier are investigated in detail.In chapter 5 the straightforward one-stage multirate FIR filter will be introduced. To satisfy the specifications, a 4096 tap lowpass FIR filter will be designed. The influence of coefficient quantization is investigated and furthermore the ``block scaling'' method, to represent small values, is presented. The single-stage implementation becomes the more unattractive the higher the filter specifications are.Chapter 6, therefore, focuses the investigations on cascaded structures. The first stage is realized as a comb or $sinc^K$ filter and decimates by a factor of 8 or 4. The frequently used conventional comb filter will be used but also a new architecture will be described. The new structure is based on the conventional comb filter with filter sharpening techniques to improve the frequency behavior. The unavoidable passband droop must be compensated for by the following lowpass FIR filter. 188 pp. Englisch.…

N° de réf. du vendeur 9783640862658

Titre
Decimation Lowpass Filters for SIGMA-DELTA Modulators - A Comparative Study
Auteur
Rüdiger Kusch
Éditeur
GRIN Verlag Mrz 2011
Année de publication
2011
État de l'article
Neu
Reliure
Taschenbuch
Langue
anglais
ISBN à 10 chiffres
3640862651
ISBN à 13 chiffres
9783640862658
Poids de l'article
281 grammes
Dimensions
210x148x14 mm

BuchWeltWeit Ludwig Meier e.K.

Bergisch Gladbach, Allemagne

Vendeur avec une évaluation de 5 étoiles

Vendeur AbeBooks depuis 11 janvier 2012

Frais d'expédition de Allemagne vers Etats-Unis

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BuchWeltWeit Ludwig Meier e.K.

Allemagne