Title :
Variable-structure compensation of delta-sigma modulators: stability and performance
Author :
Zourntos, Takis ; Johns, David A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada
fDate :
1/1/2002 12:00:00 AM
Abstract :
Develops a compensation method for continuous-time delta-sigma modulators valid for loop filters of arbitrary order. The approach, based on variable-structure theory, accommodates multilevel quantization and dithering. Stability is rigorously proved under the assumption of infinite sampling rate and is accompanied by an analytic characterization of performance. A slight modification of the basic compensator provides a defence against parametric uncertainty through the use of variable-integrator damping
Keywords :
compensation; delta-sigma modulation; quantisation (signal); variable structure systems; continuous-time delta-sigma modulators; dithering; infinite sampling rate; loop filters; multilevel quantization; parametric uncertainty; variable-integrator damping; variable-structure compensation; Circuit stability; Damping; Delta modulation; Detectors; Filters; Quantization; Sampling methods; Stability analysis; Uncertainty; Vectors;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
