Open Access Research Article

Design and Characterization of a 5.2 GHz/2.4 GHz Fractional- Frequency Synthesizer for Low-Phase Noise Performance

John WM Rogers1*, Foster F Dai2, Calvin Plett1 and MarkS Cavin3

Author Affiliations

1 Carleton University, 1125 Colonel Drive Ottawa, ON, Canada, K1S 5B6

2 Electrical and Computer Engineering Department, Auburn University, Auburn, AL 36849-5201, USA

3 Alereon, Inc., 7600 North Capital of Texas Highway, Building C, Suite 200 Austin, TX 78731, USA

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EURASIP Journal on Wireless Communications and Networking 2006, 2006:048489  doi:10.1155/WCN/2006/48489

Published: 15 March 2006


This paper presents a complete noise analysis of a -based fractional- phase-locked loop (PLL) based frequency synthesizer. Rigorous analytical and empirical formulas have been given to model various phase noise sources and spurious components and to predict their impact on the overall synthesizer noise performance. These formulas have been applied to an integrated multiband WLAN frequency synthesizer RFIC to demonstrate noise minimization through judicious choice of loop parameters. Finally, predicted and measured phase jitter showed good agreement. For an LO frequency of 4.3 GHz, predicted and measured phase noise was rms and rms, respectively.