Bula-Racines, Carlos D.

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Study of correlations among noise sources in sigma delta modulators
(2010) Bula-Racines, Carlos D.; Jiménez-Cedeño, Manuel; College of Engineering; Ducoudray, Gladys O.; Palomera-García, Rogelio; Department of Electrical and Computer Engineering; Cáceres, Luis F.
This thesis presents a study of the impact of considering correlation among noise sources when performing behavioral modeling of Sigma Delta modulators (SDM). As part of this work a procedure for derivation of input refereed noise for switched capacitor integrator including correlations among sources was outlined. A behavioral model of a 2nd order, 5-level SDM including noise sources correlation was developed in Verilog-A. In order to validate the model, it was required to know circuital and process parameters. To fulfil this requirement, a transistor level design of the mod- ulator was developed. The results of simulations produced by the behavioral model including correlations were compared against those of the transistor-level and against a previous behavioral model that does not include correlations. The results showed that considering correlations among noise sources in a behavioral model produced a more accurate approximation when compared to the transistor level results.