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On the realization of switched-capacitor integrators for sigma-delta modulators

<p>The sigma-delta techniques for analog-to-digital conversion have for long been utilized when high precision is needed. Despite the fact that these have been realized by a numerous of different structures, the theory of how to construct a sigma-delta ADC is not very extensive.</p><p>This thesis will assume that an SFG description of the CRFB sigma-delta modulator has been designed and presents a structured method to obtain a circuit realization of the integrators in a specific modulator.</p><p>The first activity is to scale the inputs to each integrator in order to make sure that the produced outputs of each integrator is within the output-range of the OTA which is used. The next thing that is presented is an algorithmic way of descending from the SFG design of the modulator down to a switched-capacitor implementation of the system.</p><p>To be able to continue with the circuit realization, one needs to do a rigorous noise analysis of the modulator, which gives the sizes of the different capacitors in the SC-circuits. The last topic of this thesis is a method to obtain the specifications of the OTA in each integrator.</p>

Identiferoai:union.ndltd.org:UPSALLA/oai:DiVA.org:liu-10570
Date January 2007
CreatorsBerglund, Krister, Matteusson, Oskar
PublisherLinköping University, Department of Electrical Engineering, Linköping University, Department of Electrical Engineering, Institutionen för systemteknik
Source SetsDiVA Archive at Upsalla University
LanguageEnglish
Detected LanguageEnglish
TypeStudent thesis, text

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