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Type: Conference paper
Title: An accurate analytical spur model for an integer-N phase-locked loop
Author: Kamal, N.
Al-Sarawi, S.
Abbott, D.
Citation: Proceedings of the 4th International Conference on Intelligent & Advanced Systems: Emerging technologies for sustainable solutions, held in Kuala Lumpur, 12-14 June, 2012; pp.659-664
Publisher: IEEE
Publisher Place: USA
Issue Date: 2012
ISBN: 9781457719677
Conference Name: International Conference on Intelligent & Advanced Systems (4th : 2012 : Kuala Lumpur)
Statement of
Noorfazila Kamal, Said Al-Sarawi and Derek Abbott
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.
Keywords: Reference spur; tuning voltage; charge pump; phase/frequency detector (PFD); voltage controlled oscillator VCO); current mismatch; loop filter
Rights: © 2011 IEEE
RMID: 0020122897
DOI: 10.1109/ICIAS.2012.6306096
Appears in Collections:Electrical and Electronic Engineering publications

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