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Excessive "jitter," caused primarily by power supply noise, can detract from the advantages of phase-locked loops. Moreover, in a multichip system, the accumulated phase error must be measured - not just the jitter.
Pong-Fei Lu, James D. Warnock, et al.
IEEE T-ED
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IEEE T-MTT
Keith A. Jenkins
IEEE SSC-L
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IEDM 2010