An accurate analytical spur model for an integer-N phase-locked loop

Noorfazila Kamal, Said Al-Sarawi, Derek Abbott

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)

Abstract

Reference spur is a limiting performance factor in an integer-N phase-locked loop (PLL). In this paper, we investigate the effect of VCO gain, ripple magnitude in VCO tuning voltage and reference frequency with reference spur magnitude. Normally, VCO gain and reference frequency are chosen according to needed system requirement, leaving only the ripple voltage on the VCO control signal to be minimised in order to minimize the reference spur. The ripple voltage is mainly contributed by current mismatch, current leakage, switching delay and discrepancies between the rise and fall times in charge pump circuit. In addition, loop filter is also affecting the ripple voltage. In this paper, we consider these effects analytically to predict ripple voltage in the VCO tuning voltage and hence calculate the reference spur magnitude of the PLL device.

Original languageEnglish
Title of host publicationICIAS 2012 - 2012 4th International Conference on Intelligent and Advanced Systems: A Conference of World Engineering, Science and Technology Congress (ESTCON) - Conference Proceedings
Pages659-664
Number of pages6
Volume2
DOIs
Publication statusPublished - 2012
Event2012 4th International Conference on Intelligent and Advanced Systems, ICIAS 2012 - Kuala Lumpur
Duration: 12 Jun 201214 Jun 2012

Other

Other2012 4th International Conference on Intelligent and Advanced Systems, ICIAS 2012
CityKuala Lumpur
Period12/6/1214/6/12

Fingerprint

Phase locked loops
Variable frequency oscillators
Electric potential
Charge pump circuits
Tuning
Leakage currents

Keywords

  • charge pump
  • current mismatch
  • loop filter
  • phase/frequency detector (PFD)
  • reference spur
  • tuning voltage
  • voltage controlled oscillator (VCO)

ASJC Scopus subject areas

  • Artificial Intelligence
  • Information Systems

Cite this

Kamal, N., Al-Sarawi, S., & Abbott, D. (2012). An accurate analytical spur model for an integer-N phase-locked loop. In ICIAS 2012 - 2012 4th International Conference on Intelligent and Advanced Systems: A Conference of World Engineering, Science and Technology Congress (ESTCON) - Conference Proceedings (Vol. 2, pp. 659-664). [6306096] https://doi.org/10.1109/ICIAS.2012.6306096

An accurate analytical spur model for an integer-N phase-locked loop. / Kamal, Noorfazila; Al-Sarawi, Said; Abbott, Derek.

ICIAS 2012 - 2012 4th International Conference on Intelligent and Advanced Systems: A Conference of World Engineering, Science and Technology Congress (ESTCON) - Conference Proceedings. Vol. 2 2012. p. 659-664 6306096.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kamal, N, Al-Sarawi, S & Abbott, D 2012, An accurate analytical spur model for an integer-N phase-locked loop. in ICIAS 2012 - 2012 4th International Conference on Intelligent and Advanced Systems: A Conference of World Engineering, Science and Technology Congress (ESTCON) - Conference Proceedings. vol. 2, 6306096, pp. 659-664, 2012 4th International Conference on Intelligent and Advanced Systems, ICIAS 2012, Kuala Lumpur, 12/6/12. https://doi.org/10.1109/ICIAS.2012.6306096
Kamal N, Al-Sarawi S, Abbott D. An accurate analytical spur model for an integer-N phase-locked loop. In ICIAS 2012 - 2012 4th International Conference on Intelligent and Advanced Systems: A Conference of World Engineering, Science and Technology Congress (ESTCON) - Conference Proceedings. Vol. 2. 2012. p. 659-664. 6306096 https://doi.org/10.1109/ICIAS.2012.6306096
Kamal, Noorfazila ; Al-Sarawi, Said ; Abbott, Derek. / An accurate analytical spur model for an integer-N phase-locked loop. ICIAS 2012 - 2012 4th International Conference on Intelligent and Advanced Systems: A Conference of World Engineering, Science and Technology Congress (ESTCON) - Conference Proceedings. Vol. 2 2012. pp. 659-664
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