Reference spur suppression technique using ratioed current charge pump

Noorfazila Kamal, S. F. Al-Sarawi, D. Abbott

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Reference spurs are one of the main problems in integer-N phaselocked loops (PLLs). A ratioed current charge pump is proposed to suppress reference spur magnitude in the PLL output. The ratioed current charge pump can be implemented by resizing the source and drain network of the charge pump. A formula to calculate the ratioed current and transistor size is presented. The reference spur magnitude for a PLL with a ratioed current charge pump is compared to a conventional charge pump PLL, resulting in about 4 dBc/Hz improvement in the reference spur magnitude.

Original languageEnglish
Pages (from-to)746-747
Number of pages2
JournalElectronics Letters
Volume49
Issue number12
DOIs
Publication statusPublished - 6 Jun 2013

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ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Reference spur suppression technique using ratioed current charge pump. / Kamal, Noorfazila; Al-Sarawi, S. F.; Abbott, D.

In: Electronics Letters, Vol. 49, No. 12, 06.06.2013, p. 746-747.

Research output: Contribution to journalArticle

Kamal, Noorfazila ; Al-Sarawi, S. F. ; Abbott, D. / Reference spur suppression technique using ratioed current charge pump. In: Electronics Letters. 2013 ; Vol. 49, No. 12. pp. 746-747.
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