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

fYear

2006

fDate

17-19 Jan. 2006

Lastpage

16

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/DELTA.2006.94

Filename

1581180