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New Approach to Optimize a Sigma Delta Modulator


Dadi Mohamed b?chir, Bouallegue Ridha, Ezzeddine taher


Vol. 7  No. 6  pp. 250-253


In this paper, a new approach to optimize a sigma-delta modulator has been presented. This last became the most popular tools in analog-to-digital conversion application. Sigma delta modulator will be the most suitable choice for multistandard system reception. We proposed to add dither before the quantizer of sigma-delta modulator in order to eliminate any distortions introduced by the quantization stage. Simulation of second-order sigma-delta modulator for the GSM receiver has proved that this adapted method is very efficient term of linearity as well as of gain in Signal to Noise Ratio (SNR).


Dither,GSM,sigma-delta modulator