Monday October 25 4:00 - 5:00 PM Kelley 1001
Nima Maghari School of EECS Oregon State University The Good, The Bad, and The Ugly: Facets of Delta-Sigma Modulators Today's advancements in deep CMOS processes and mobile telecommunication systems have imposed many new challenges for analog designers. Meanwhile, the ongoing improvements in digital signal processing are leading to faster and more sophisticated ways of processing information. Despite the digital nature of information processing, the input in many of these systems is analog, therefore demanding ADCs with high-speed conversion rates. Among various types of ADCs, the delta-sigma modulators are the most commonly used oversampled ADCs. These structures can achieve high conversion resolutions despite using moderately accurate analog building blocks. However, these structures have a limited signal bandwidth and stability issues. As a result, a contradiction arises between the conversion speed and the ability to utilize coarse analog blocks. In light of these challenges, a study of the commonly used delta-sigma modulators is presented with an emphasis on stability and adaptability o f the new-to-come CMOS processes. Biography Nima Maghari received the B.Sc. degree in Electrical Engineering from the University of Tehran, Iran, in 2004, and the Ph.D. degree in electrical engineering from Oregon State University in 2010. From 2004 to 2006, he was with IC-LAB, University of Tehran, where he was involved with audio delta-sigma converters and low-voltage bandgap references. Currently he is with Oregon State University working as an associate researcher. His research interests are in high performance data converters, with a specialization in oversampling conversion techniques. _______________________________________________ Colloquium mailing list [email protected] https://secure.engr.oregonstate.edu/mailman/listinfo/colloquium
