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

A Comparative Study

Nonfiction, Science & Nature, Technology, Electricity
Cover of the book Decimation Lowpass Filters for SIGMA-DELTA Modulators - A Comparative Study by Rüdiger Kusch, GRIN Publishing
View on Amazon View on AbeBooks View on Kobo View on B.Depository View on eBay View on Walmart
Author: Rüdiger Kusch ISBN: 9783638237734
Publisher: GRIN Publishing Publication: December 6, 2003
Imprint: GRIN Publishing Language: English
Author: Rüdiger Kusch
ISBN: 9783638237734
Publisher: GRIN Publishing
Publication: December 6, 2003
Imprint: GRIN Publishing
Language: English

Master's Thesis from the year 1998 in the subject Electrotechnology, grade: 1,0 (A), University of Rhode Island (--), 39 entries in the bibliography, 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.

View on Amazon View on AbeBooks View on Kobo View on B.Depository View on eBay View on Walmart

Master's Thesis from the year 1998 in the subject Electrotechnology, grade: 1,0 (A), University of Rhode Island (--), 39 entries in the bibliography, 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.

More books from GRIN Publishing

Cover of the book Peut-on juger les présidents africains? by Rüdiger Kusch
Cover of the book A Book Analysis of 'The Hidden Connections: A Science for Sustainable Living' by Fritjof Capra by Rüdiger Kusch
Cover of the book Variety of love in Shakespeare's 'Twelfth Night' by Rüdiger Kusch
Cover of the book 'I have a wyf, the worste that may be' - The representation of marriage in the Canterbury Tales by Rüdiger Kusch
Cover of the book An investigation of the effects of taxes on work decisions on the example of the WFTC in the UK by Rüdiger Kusch
Cover of the book EU and turkish foreign policies - synergies for the Southern Caucasus? by Rüdiger Kusch
Cover of the book Staying with the original lender is a double-edged sword by Rüdiger Kusch
Cover of the book Spiritual Isolation in 'The Ballad of the Sad Café' by Rüdiger Kusch
Cover of the book Metaphor and Space: The Cognitive Approach to Spatially Structured Concepts by Rüdiger Kusch
Cover of the book Consider how international institutions can help in the protection of human rights by Rüdiger Kusch
Cover of the book Violence and Consumerism in Bret Easton Ellis's 'American Psycho' and Chuck Palahniuk's 'Fight Club' by Rüdiger Kusch
Cover of the book Country Report on South Africa and Turkey by Rüdiger Kusch
Cover of the book Intercultural differences of customer emotions in service encounters by Rüdiger Kusch
Cover of the book Private label brands are a threat for high value manufacturer's brands such as 'Charmin'! by Rüdiger Kusch
Cover of the book Dell: Can Rivals Beat Its Strategy? by Rüdiger Kusch
We use our own "cookies" and third party cookies to improve services and to see statistical information. By using this website, you agree to our Privacy Policy