Analysis of the effect of PFD sampling on charge-pump PLL stability

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2 Citations (Scopus)

Abstract

The sampling nature of the phase-frequency detector (PFD) degrades the stability of the charge-pump phase-locked loop (CPPLL). This paper analyzes the effect of the PFD sampling on the CPPLL stability by using z-transform. The PFD is modeled as a zero-order hold to perform the z-domain analysis. The stability boundary predicted by the analysis is accurate and verified by simulations using Cadence Spectre. In addition, a physical interpretation of how sampling destabilizes an otherwise stable continuous feedback system is provided in time domain, which brings valuable insight into the operation of sampled feedback systems like CPPLL.

Original languageEnglish
Title of host publication2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Proceedings
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Pages1-5
Number of pages5
ISBN (Electronic)978-1-5386-4881-0
ISBN (Print)978-1-5386-4882-7
DOIs
Publication statusPublished - 26 Apr 2018
Event2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Florence Conference Center, Florence, Italy
Duration: 27 May 201830 May 2018
https://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=8334884

Conference

Conference2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018
Abbreviated titleISCAS 2018
CountryItaly
CityFlorence
Period27/05/1830/05/18
Internet address

Keywords

  • Phase-frequency detector
  • phase-locked loop
  • sampling
  • zero-order hold

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