Table of Contents
ISRN Electronics
Volume 2012 (2012), Article ID 538597, 10 pages
http://dx.doi.org/10.5402/2012/538597
Review Article

Sigma-Delta Modulation Based Digital Filter Design Techniques in FPGA

School of Electrical and Computer Engineering, RMIT University, Melbourne, VIC 3001, Australia

Received 15 August 2012; Accepted 8 October 2012

Academic Editors: T. Laopoulos and V. McGahay

Copyright © 2012 Tayab Memon et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this paper efficient digital filter design techniques categorized as sigma-delta modulation based short word length (SWL) and multibit (or contemporary) techniques are reviewed in terms of hardware complexity, area, performance and power tradeoffs, synthesis issues, and algorithm versatility. More recent, general purpose DSP applications including classical LMS algorithms reported using sigma-delta modulation encoding are reviewed thoroughly. A small number of basic arithmetic circuits designed using sigma-delta modulation encoding and synthesized by using FPGAs are also described. Finally, recent FPGA based area-performance-power analysis of single-bit ternary FIR filtering is discussed and compared to its corresponding multi-bit system. This work shows that in most cases single-bit ternary FIR-like filters are able to outperform their equivalent multi-bit filters in terms of area, power, and performance.