Decimation Lowpass Filters for Sigma-Delta Modulators

Lingua: inglese

Editore: Diplom.De Dez 2002, 2002

3838662326 / 9783838662329

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This item is printed on demand - Print on Demand Titel. Neuware -Inhaltsangabe: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 SD-modulator with 90dB dynamic range (SNR+THD) will be presented, which has been fabricated in 1.2µm 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 sincK 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. In order to compare several [¿]Diplomica Verlag, Hermannstal 119k, 22119 Hamburg 188 pp. Englisch.

Codice articolo 9783838662329

Titolo
Decimation Lowpass Filters for Sigma-Delta Modulators
Autore
Rüdiger Kusch
Editore
Diplom.De Dez 2002
Anno di pubblicazione
2002
Condizione
Neu
Rilegatura
Taschenbuch
Lingua
inglese
ISBN 10
3838662326
ISBN 13
9783838662329
Peso dell'articolo
281 grammi
Dimensioni
210x148x14 mm

buchversandmimpf2000

Emtmannsberg, BAYE, Germania

Venditore con 5 stelle

Venditore AbeBooks dal 23 gennaio 2017

Tariffe di spedizione da Germania a U.S.A.

ArticoloDa 60 a 60 giorni lavorativiDa 60 a 60 giorni lavorativi
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Impressum Thorsten Retsch Buchversand Mimpf2000 Oberölschnitz 16 95517 Emtmannsberg Deutschland Telefon: 09209-2023188 Email: mimpf2000@online.de USt-ID-Nr.: DE 235096871 Wir führen gebrauchte Bücher aus allen Sparten der Literatur

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