Title :
Adaptive high performance ΣΔ modulator designs
Author :
Y. Daghan Gokdel;Selcuk Talay;Gunhan Dundar
Author_Institution :
Bogazici University, Dept. of Electrical and Electronics Eng., 34342 Bebek/Istanbul, Turkey
fDate :
7/1/2007 12:00:00 AM
Abstract :
In this paper, different solutions to the saturation problem of the integrator building block of sigma-delta (SD) modulators are proposed. Saturation causes an error that limits the dynamic input range of SD A/D converters and consequently decreases its SNR. The proposed structure, using a variable gain integrator followed by a non-uniform quantizer as companding, makes the usage of higher input levels to the A/D converter possible. Also with speech signals in which very high and very low signals reside, this architecture performs much better.
Keywords :
"Noise shaping","Capacitors","Circuit noise","Low pass filters","Dynamic range","Quantization","Band pass filters","Gain","Degradation","Resistors"
Conference_Titel :
Research in Microelectronics and Electronics Conference, 2007. PRIME 2007. Ph.D.
Print_ISBN :
978-1-4244-1000-2
DOI :
10.1109/RME.2007.4401867