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Characterization and Digital Correction of Multi-bit Delta-sigma Modulators
Ottawa-Carleton Institute for Electrical Engineering
Department of Electronics
Faculty of Engineering
Carleton University
Ottawa, Canada
Abstract
Delta-sigma modulators are mostly used in high resolution applications such as
digital audio, digital telephony, and instrumentation.
Multi-bit delta-sigma modulators exhibit a number of attractive features such as
providing higher resolution than that of single-bit modulators theoretically and improving
stability characteristics. However, stringent accuracy requirements are placed on the
digital-to-analog converters used in the feedback loop since the delta-sigma modulators
are particularly sensitive to static nonlinearity.
Many nonlinearity compensation methods in multi-bit delta-sigma modulators
have been published such as the element trinlrning methods, the dynamic element
matching method, the dual-quantizer ADC architecture and many digital correction
methods. None of the methods has fully solved the nonlinearity problem yet.
A novel system identification approach is proposed in this thesis. This method can
help characterize a multi-bit sigma-delta modulator. Simulation and hardware testing has
been done on the system identification method to prove its practicability. |
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发表于 2008-1-16 22:26:33
发表于 2008-1-17 00:37:17
