Open AccessTechnique to Improve SNR for Sigma Delta Adcs for Audio Signals
Author(s) -
Ramana Murthy Dumpala
Publication year - 2018
Publication title -
international journal of engineering and technology
Language(s) - English
Resource type - Journals
ISSN - 2227-524X
DOI - 10.14419/ijet.v7i3.6.14946
Subject(s) - delta sigma modulation , electronic engineering , converters , transfer function , computer science , noise (video) , noise shaping , architecture , sigma , engineering , electrical engineering , artificial intelligence , physics , cmos , art , visual arts , quantum mechanics , voltage , image (mathematics)
A RISR architecture for Sigma-delta analog to digital converters with modified noise transfer function to obtain a better performance in terms of SNR is proposed. Cascading of two modified second order modulators are done to achieve 4th order modulator. Behavioral simulations are done to study the performance of feed-forward and the modified cascaded architecture. They are designed to operate at 1.28MHz clock frequency for audio applications (OSR of 32). It is noted that SNR of 115dB is achieved by cascading of two Modified second order RISR architectures which is 8dB more than the normal RISR architecture.