Decimation Lowpass Filters for Sigma-Delta Modulators - A Comparative Study (Paperback)

Scholarly Research Paper from the year 1998 in the subject Electrotechnology, grade: 1,0, Technical University of Braunschweig (Elektrotechnik), language: English, abstract: 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 1.2um 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 repr

General

Imprint:	Diplom.de
Country of origin:	United States
Release date:	December 2002
First published:	December 2002
Authors:	Rudiger Kusch
Dimensions:	210 x 148 x 11mm (L x W x T)
Format:	Paperback - Trade
Pages:	188
ISBN-13:	978-3-8386-6232-9
Categories:	Books > Professional & Technical > Energy technology & engineering > Electrical engineering > General Promotions
LSN:	3-8386-6232-6
Barcode:	9783838662329

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