On the realization of switched-capacitor integrators for sigma-delta modulators
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
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.
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.
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.
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.
Place, publisher, year, edition, pages
Institutionen för systemteknik , 2007. , 118 p.
Sigma-Delta modulator, Analog-to-digital converter, Switched-Capacitor, Scaling, Low-power, Analog IC design
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:liu:diva-10570ISRN: LiTH-ISY-EX--07/4126--SEOAI: oai:DiVA.org:liu-10570DiVA: diva2:17303
2007-12-14, 00:00 (English)