Analysis of Phase-Locked Loops using the Best Linear Approximation

Scriptie/masterproef: Master's Thesis


The phase-locked loop is the beating heart of every modern wireless communication system by providing the local oscillator function in transceivers. Although, the phase-locked loop is omnipresent in the current information age, the design and realisation of such a loop
remain challenging tasks. Therefore, the presented work concentrates on one specific aspect: the creation of an identification framework which analyses the nonlinear behaviour of the phase-locked loop. For this purpose, the best linear approximation is used to pinpoint the dominant
sources of nonlinear distortion. By incorporating the knowledge of the sources of nonlinearity in the design stage, the overall nonlinear behaviour of the system can be reduced, resulting in high-performance phase-locked loops. In this dissertation, the succeeding advancements have
been realised:
• Decomposition of the proposed phase-locked loop architecture in its basic building blocks, which allows to describe its behaviour in the phase domain by a linear model.
• Creation and validation of a simulation setup using Matlab and Simulink.
• Development and implementation of a closed loop identification scheme, by introducing the best linear approximation in the phase domain. Also, a study is conducted to verify whether the proposed methods function as expected.
• Application of the developed identification framework on the complete phase-locked loop.
Datum Prijs22 jun 2015
BegeleiderAdam Cooman (Advisor) & Gerd Vandersteen (Promotor)

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