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Type: Journal article
Title: Reference spur suppression technique using ratioed current charge pump
Author: Kamal, N.
Al-Sarawi, S.
Abbott, D.
Citation: Electronics Letters, 2013; 49(12):746-747
Publisher: IEE-Inst Elec Eng
Issue Date: 2013
ISSN: 0013-5194
Statement of
N. Kamal, S.F. Al-Sarawi and D. Abbott
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.
Rights: © Copyright 2013 IEEE - All rights reserved.
RMID: 0020130399
DOI: 10.1049/el.2013.1010
Appears in Collections:Electrical and Electronic Engineering publications

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