Effective dithering of digital delta-sigma modulators, with applications to fractional-N frequency synthesis

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dc.check.date2022-04-09T11:39:38Z
dc.check.embargoformatHard bound copy in Library onlyen
dc.check.entireThesisEntire Thesis Restricted
dc.check.infoRestricted to everyone for five yearsen
dc.check.opt-outYesen
dc.check.reasonThis thesis is due for publication or the author is actively seeking to publish this materialen
dc.contributor.advisorKennedy, Michael Peteren
dc.contributor.authorMo, Hongjia
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderEnterprise Irelanden
dc.date.accessioned2017-04-10T11:39:38Z
dc.date.issued2016
dc.date.submitted2016
dc.description.abstractDelta-sigma modulators, both analog and digital, are widely used in a vast range of modern electronic components such as data converters, fractional-N frequency synthesizers, all-digital phase-locked loops and power amplifiers. Digital delta-sigma modulators (DDSMs) have received less attention in the literature in comparison to analog delta-sigma modulators (ADSMs) despite the fact that digital implementations are at least as important as their analog counterparts. This thesis aims to enhance the theoretical understanding of the operation of DDSMs, with a view to developing novel applications for the most popular architectures, namely Error Feedback Modulator (EFM) and Multi stAge noise SHaping (MASH) DDSMs. DDSMs are finite state machines; their spectra are characterized by strong periodic tones (so-called spurs) when they cycle repeatedly in time through a small number of states. This can happen for a range of constant and periodic inputs. Over the past decade, much research has been carried out to find ways to reduce the magnitudes of the spurs produced by DDSMs. Dither generators based on linear feedback shift registers (LFSRs) are widely used to break up periodic cycles in DDSMs. Unfortunately, pseudorandom LFSRs are themselves periodic and therefore may have limited effectiveness. This first part of this thesis presents a rigorous mathematical analysis of DDSMs with LFSR-based dither, and a design methodology to achieve effective dithering. The second part of the thesis presents some practical applications arising from our theoretical work. A nested fractional-N frequency synthesizer which uses a bus-splitting DDSM to allow higher clock frequencies is developed. A MASH DDSM employing higher-order dither noise shaping to eliminate spurious tones is investigated. A mechanism for nonlinear distortion in fractional-N frequency synthesizers arising from the modulo nonlinearity of the DDSM is proposed.en
dc.description.sponsorshipScience Foundation Ireland (SFI Grant 13/IA/1979) & (SFI Grant 13/RC/2077); Enterprise Ireland (Grant CC-2009-05)en
dc.description.statusNot peer revieweden
dc.description.versionAccepted Version
dc.format.mimetypeapplication/pdfen
dc.identifier.citationMo, H. 2016. Effective dithering of digital delta-sigma modulators, with applications to fractional-N frequency synthesis. PhD Thesis, University College Cork.en
dc.identifier.urihttps://hdl.handle.net/10468/3868
dc.language.isoenen
dc.publisherUniversity College Corken
dc.rights© 2016, Hongjia Mo.en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/en
dc.subjectRandom number generationen
dc.subjectDelta-sigma modulationen
dc.subjectNoise shapingen
dc.subjectDDSMen
dc.subjectPLLen
dc.subjectFrequency synthesizeren
dc.subjectDitheren
dc.thesis.opt-outtrue
dc.titleEffective dithering of digital delta-sigma modulators, with applications to fractional-N frequency synthesisen
dc.typeDoctoral thesisen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePHD (Engineering)en
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