Optimal Sigma Delta Modulator Architectures for Fractional-N Frequency Synthesis
2010 (English)In: IEEE Transactions on Very Large Scale Integration (vlsi) Systems, ISSN 1063-8210, Vol. 18, no 2, 194-200 p.Article in journal (Refereed) Published
This paper presents a comparative study of Sigma Delta modulators for use in fractional-N phase-locked loops. It proposes favorable modulator architectures while taking into consideration not only the quantization noise of the modulator but also other loop nonidealities such as the charge pump current mismatch that contributes to the degradation in the synthesized tone's phase noise. The proper choice of the modulator architecture is found to be dependent upon the extent of the nonideality, reference frequency, and loop bandwidth. Three modulator architectures are then proposed for low, medium, and high levels of nonidealities.
Place, publisher, year, edition, pages
2010. Vol. 18, no 2, 194-200 p.
Frequency synthesizers, phase-locked loops (PLLs), phase noise, Sigma Delta modulation
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-13978DOI: 10.1109/TVLSI.2008.2009058ISI: 000273774700003ScopusID: 2-s2.0-75549083172OAI: oai:DiVA.org:kth-13978DiVA: diva2:328748
FunderSwedish Research Council
QC 20100706. Tidigare titel: Selection of Optimal Sigma Delta Modulator Architecture for Fractional-N Frequency Synthesis.2010-07-062010-07-062011-01-27Bibliographically approved