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

D. Dhar; P.T.M.  van Zeijl; D. Milosevic; H. Gao; P.G.M. Baltus

doi:10.1109/ISCAS.2018.8351180

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

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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 language	English
Title of host publication	2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Proceedings
Place of Publication	Piscataway
Publisher	Institute of Electrical and Electronics Engineers
Pages	1-5
Number of pages	5
ISBN (Electronic)	978-1-5386-4881-0
ISBN (Print)	978-1-5386-4882-7
DOIs	https://doi.org/10.1109/ISCAS.2018.8351180
Publication status	Published - 26 Apr 2018
Event	2018 IEEE International Symposium on Circuits and Systems (ISCAS 2018) - Florence Conference Center, Florence, Italy Duration: 27 May 2018 → 30 May 2018 https://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=8334884

Conference

Conference	2018 IEEE International Symposium on Circuits and Systems (ISCAS 2018)
Abbreviated title	ISCAS 2018
Country/Territory	Italy
City	Florence
Period	27/05/18 → 30/05/18
Internet address	https://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=8334884

Funding

ACKNOWLEDGMENT We would like to sincerely thank STW financial assistance to our project.

Keywords

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

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10.1109/ISCAS.2018.8351180

Cite this

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title = "Analysis of the effect of PFD sampling on charge-pump PLL stability",

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.",

keywords = "Phase-frequency detector, phase-locked loop, sampling, zero-order hold",

author = "D. Dhar and \{van Zeijl\}, P.T.M. and D. Milosevic and H. Gao and P.G.M. Baltus",

year = "2018",

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publisher = "Institute of Electrical and Electronics Engineers",

address = "United States",

note = "2018 IEEE International Symposium on Circuits and Systems (ISCAS 2018), ISCAS 2018 ; Conference date: 27-05-2018 Through 30-05-2018",

url = "https://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=8334884",

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Dhar, D , van Zeijl, PTM , Milosevic, D, Gao, H & Baltus, PGM 2018, Analysis of the effect of PFD sampling on charge-pump PLL stability. in 2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Proceedings., 8351180, Institute of Electrical and Electronics Engineers, Piscataway, pp. 1-5, 2018 IEEE International Symposium on Circuits and Systems (ISCAS 2018), Florence, Italy, 27/05/18. https://doi.org/10.1109/ISCAS.2018.8351180

Analysis of the effect of PFD sampling on charge-pump PLL stability. / Dhar, D.; van Zeijl, P.T.M. ; Milosevic, D. et al.
2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Proceedings. Piscataway: Institute of Electrical and Electronics Engineers, 2018. p. 1-5 8351180.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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T1 - Analysis of the effect of PFD sampling on charge-pump PLL stability

AU - Dhar, D.

AU - van Zeijl, P.T.M.

AU - Milosevic, D.

AU - Gao, H.

AU - Baltus, P.G.M.

PY - 2018/4/26

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N2 - 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.

AB - 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.

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KW - phase-locked loop

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KW - zero-order hold

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BT - 2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Proceedings

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ER -

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

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Keywords

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