EURASIP Journal on Advances in Signal Processing 
Volume 2008 (2008), Article ID 426502, 6 pages
doi:10.1155/2008/426502
Research Article

Description of a 2-Bit Adaptive Sigma-Delta Modulation System with Minimized Idle Tones

E. A. Prosalentis and G. S. Tombras

 Laboratory of Electronics, Department of Physics, University of Athens, Panepistimiopolis, Athens 157 84, Greece
Received 3 June 2007; Revised 24 September 2007; Accepted 28 October 2007

Recommended by Jiri Jan

Abstract

A 2-bit adaptive sigma delta modulation system that inherently eliminates the idle tones present in conventional and other adaptive sigma delta systems is described. The system incorporates both memory and look-ahead instantaneous step-size estimations and, as shown by computer simulation results apart from eliminating the unwanted idle tones despite dithering, it offers improved SNR performance and extended dynamic range.