A Methodology for Designing Continuous-Time Sigma-Delta Modulators

Authors:
Philippe Benabes;Mansour Keramat;Richard Kielbasa
Affiliations:
Ecole Superieure d'Electricité, Plateau de Moulon, F91192, Gif Sur Yvette, France;Ecole Superieure d'Electricité, Plateau de Moulon, F91192, Gif Sur Yvette, France;Ecole Superieure d'Electricité, Plateau de Moulon, F91192, Gif Sur Yvette, France
Venue:
EDTC '97 Proceedings of the 1997 European conference on Design and Test
Year:
1997

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Abstract

A methodology for analysis and synthesis of lowpass sigma-delta (/spl Sigma//spl Delta/) converters is presented in this paper. This method permits to synthesize /spl Sigma//spl Delta/ modulators employing continuous-time filters from discrete-time topologies. The analysis method is based on the discretization of continuous-time model and using a discrete simulator which is more efficient than an analog simulator. Finally, a realistic design of a second-order /spl Sigma//spl Delta/ modulator with a compensation of the non ideal behavior of DAC is given. Moreover, simulation results show a good agreement with the theoretical bases.