A divider controller for optimized fractional-N frequency synthesizer spectral performance in the presence of loop nonlinearities

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dc.contributor.advisor Kennedy, Michael Peter en
dc.contributor.advisor O'Connell, Ivan en
dc.contributor.author Donnelly, Yann
dc.date.accessioned 2019-01-16T12:56:18Z
dc.date.issued 2018
dc.date.submitted 2018
dc.identifier.citation Donnelly, Y. 2019. A divider controller for optimized fractional-N frequency synthesizer spectral performance in the presence of loop nonlinearities. PhD Thesis, University College Cork. en
dc.identifier.uri http://hdl.handle.net/10468/7305
dc.description.abstract The fractional-N Phase Lock Loop (PLL) is an essential block in modern radio frequency systems, where it is used primarily for frequency synthesis. The primary feature of the fractional-N PLL is the use of a modulator, the so-called “divider controller”, to control the feedback divider. The arbitrary accuracy of frequency synthesis comes at the cost of phase noise in the output frequency spectrum, in particular spurious frequency components (spurs). When these components appear in the passband of the loop response, they dominate in the overall frequency spectrum. This thesis demonstrates that these spurs occur as a result of the interaction between modulation noise, introduced by the divider controller, and nonlinearities in the PLL. A mechanism is presented describing the generation of these spurs. A semianalytical method of determining the spurs and phase noise resulting from a given choice of divider controller and nonlinearity is presented, requiring only knowledge of the controller’s accumulated output probability mass function and the nonlinearity. A number of candidate divider controllers are studied, and the performance of the Nested Cascaded MASH and MASH-SQ Hybrid are derived. A novel controller is presented, and it is shown that this controller can be used to mitigate the problem through a “spur avoidance” technique. An implementation of this controller is evaluated, and found to offer a worst spur reduction of between 7.0 dB and 19.5 dB compared to a standard MASH-based divider controller, as well as spur reductions of between 15.6 dB and 24.5 dB in the absence of bleed current. The best observed worst spur height of −83.9 dBc is significantly lower than previous reported state-of-the-art. Finally, a hitherto underexplored phenomenon, termed the Wandering Spur, is examined. This phenomenon is shown to be derived from the architecture of the MASH modulator, and an analytical prediction in the MASH 1-1 case is presented. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2018, Yann Donnelly. en
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/ en
dc.subject Phase lock loop en
dc.subject Frequency synthesizer en
dc.subject Spurious en
dc.subject Spur en
dc.subject Phase noise en
dc.subject Nonlinearity en
dc.subject Nonideality en
dc.subject Wireless en
dc.subject Radio frequency en
dc.title A divider controller for optimized fractional-N frequency synthesizer spectral performance in the presence of loop nonlinearities en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD en
dc.internal.availability Full text not available en
dc.check.info Restricted to everyone for five years en
dc.check.date 2024-01-15T12:56:18Z
dc.description.version Accepted Version
dc.contributor.funder Irish Research Council en
dc.contributor.funder Science Foundation Ireland en
dc.description.status Not peer reviewed en
dc.internal.school Electrical and Electronic Engineering en
dc.check.reason Releasing this thesis would cause substantial prejudice to the commercial interests of University College Cork en
dc.check.opt-out Yes en
dc.thesis.opt-out true
dc.check.entireThesis Entire Thesis Restricted
dc.check.embargoformat Apply the embargo to the hard bound thesis (If you have not submitted an e-thesis and want to embargo the hard bound thesis in UCC Library) en
dc.internal.conferring Spring 2019 en
dc.internal.ricu Tyndall National Institute en
dc.relation.project info:eu-repo/grantAgreement/SFI/SFI Research Centres/13/RC/2077/IE/CONNECT: The Centre for Future Networks & Communications/ en
dc.relation.project Irish Research Council (Grant Number GOIPG/2014/14222) en


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© 2018, Yann Donnelly. Except where otherwise noted, this item's license is described as © 2018, Yann Donnelly.
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