Variable-Structure Compensation of Delta–Sigma Modulators: Stability and Performance
نویسندگان
چکیده
We develop a compensation method for continuous-time delta–sigma modulators valid for loop filters of arbitrary order. Our 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.
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