EURASIP Journal on Advances in Signal Processing
Volume 2007 (2007), Article ID 18361, 7 pages
doi:10.1155/2007/18361
Research Article

A Multiplierless DC-Blocker for Single-Bit Sigma-Delta Modulated Signals

Amin Z. Sadik,1 Zahir M. Hussain,1 and Peter O'Shea2

1School of Electrical and Computer Engineering, RMIT University, Melbourne 3001, Victoria, Australia
2School of Engineering Systems, Queensland University of Technology, Brisbane 4001, Qld, Australia

Received 11 February 2006; Revised 29 July 2006; Accepted 10 September 2006

Academic Editor: Roger Woods

Copyright © 2007 Amin Z. Sadik 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

The DC content in single-bit domain is both undesirable and hard to remove. In this paper we propose a single-bit multiplierless DC-blocker structure. The input is assumed to be sigma-delta modulated bitstream. This DC-blocker is designed using a delta modulator topology with a sigma-delta modulator (SDM) embedded in its feedback path. Its performance is investigated in terms of the overall signal-to-noise ratio, the effectiveness of DC removal, and the stability. The proposed structure is efficient for hardware realisation.