A Formulation for the Synthesis of Robust Digital Correction Filters in Cascaded Sigma-Delta Converters
Mahbub Gani
Abstract:
Cascaded sigma-delta converters relax the requirements on the oversampling ratio for a given resolution, but their performance is sensitive to imperfections in the analog components. Previous work has focussed on adaptive calibration schemes to address this problem. In contrast, the main contribution of the present work is the development of a framework for the synthesis of robust digital correction filters that provide a guaranteed level of performance for the worst case uncertainty in parameter values. The validity of the approach is established by successfully reproducing well-known results.
Keywords:
Cascaded sigma-delta converters, robust control, software radio, structured singular value
