Title :
Using dither to improve the performance of lossy sigma-delta modulators
Author :
Goette, Josef ; Jacomet, Marcel ; Hager, Markus
Author_Institution :
Interdisciplinary Inst. of Integrated Syst., Berne Univ. of Appl. Sci., Biel-Bienne
Abstract :
Conventional sigma-delta (SigmaDelta) analog-to-digital (AD) converters are based on an active analog SigmaDelta modulator followed by a digital filter. In earlier papers we proposed a new architecture for a first-order SigmaDelta modulator that needs no active analog components. Its advantage is that AD converters can be implemented within FPGAs or directly in the software of microprocessors. Its disadvantage is, however, that it realizes a lossy SigmaDelta modulator with an accompanying limited resolution. Here we propose to use dither-injection to relax that resolution limitation and we present simulation results showing that our ideas work
Keywords :
digital filters; sigma-delta modulation; FPGA; active analog components; analog-to-digital converters; digital filters; dither-injection; microprocessor software; sigma-delta modulators; CMOS technology; Computer architecture; Delta-sigma modulation; Digital modulation; Digital signal processing; Integrated circuit technology; Microprocessors; Performance loss; Signal resolution; Very large scale integration; Ad con- Fpga-and microprocessor implementations.; Lossy sumvartriangle modulator; dither;
Conference_Titel :
Electronic Design, Test and Applications, 2006. DELTA 2006. Third IEEE International Workshop on
Conference_Location :
Kuala Lumpur
Print_ISBN :
0-7695-2500-8
DOI :
10.1109/DELTA.2006.94
