Output-jitter performance of second-order digital bang-bang phase-locked loops with nonaccumulative reference clock jitter

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Title: Output-jitter performance of second-order digital bang-bang phase-locked loops with nonaccumulative reference clock jitter
Authors: Tertinek, Stefan
Feely, Orla
Permanent link: http://hdl.handle.net/10197/3594
Date: Jun-2011
Abstract: Bang-bang phase-locked loops (BBPLLs) are inherently nonlinear systems due to the binary phase detector (BPD). While they are typically used for clock and data recovery, the ongoing trend toward digital loop implementations has resulted in several digital BBPLLs (DBBPLLs) suitable for frequency synthesis. This brief investigates the effect of nonaccumulative reference clock jitter (due to white phase noise) in second-order DBBPLLs, comparing the output jitter with that of first-order DBBPLLs. For small clock jitter, the nonlinear loop behavior is modeled as a two-dimensional Markov chain, and the output jitter is smaller than but close to that of a first order loop. For large clock jitter, the BPD nonlinearity is linearized, and the output jitter is larger than that of a first order loop; it is proportional to clock jitter and inversely proportional to the square root of the stability factor—the ratio of the proportional path gain to the integral-path gain of the digital loop filter.
Funding Details: Science Foundation Ireland
Type of material: Journal Article
Publisher: IEEE
Copyright (published version): 2011 IEEE
Keywords: Phase-locked loop;Bang-bang;Markov chain;Timing jitter;Binary phase detector
Subject LCSH: Phase-locked loops
Markov processes
Phase detectors
DOI: 10.1109/TCSII.2011.2149650
Language: en
Status of Item: Peer reviewed
Appears in Collections:Electrical and Electronic Engineering Research Collection

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