Modified phase-frequency detector for improved response of PLL servo controller

Christopher A. Adkins, Bruce L. Walcott, Michael A. Marra

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


This paper presents a modification of a well known phase-frequency detector to improve closed-loop damping in a phase-locked loop DC servo control mechanism. In a closed-loop servo system that contains non-linearities, disturbances in the steady-state response are expected. These disturbances may cause the system to break phase-lock. If this occurs there will be more disturbances created by the PLL as phase-lock is achieved again. A modified PFD will be discussed that allows for a small amount of steady-state disturbance without losing phase-lock.

Original languageEnglish
Pages (from-to)19-20
Number of pages2
JournalProceedings of the American Control Conference
StatePublished - 2002

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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