there are some books and thesis they are good, i think
book
Top Down Design of High Performance Sigma Delta Modulators-Medeiro-1999
DeIta-Sigma Data Converters-Norsworthy
Understanding Delta-Sigma Data Converters(Temes)
thesis
High-Speed, Low-Power Sigma-Delta Modulators for RF Baseband Channel Applications - Arnold R. Feldman
Design and implementation of oversampled analog-to-digital converters - Bernhard Ernst Boser
Modeling and design of high-resolution sigma-delta modulators - Louis Albert III William
Oversampled Analog-to-Digital Conversion - Brian Paul Brandt