A subharmonically injected phase-locked loop for 5-GHz applications

This work introduces a modified subharmonic injection‐locked phase‐locked loop (S‐ILPLL) that feeds the phase comparator with half the frequency of the voltage‐controlled oscillator by employing a divider in the loop feedback path. The main objective is to address the phase noise improvement of subh...

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Bibliographic Details
Published in:Microwave and optical technology letters 2006-11, Vol.48 (11), p.2158-2162
Main Authors: Plessas, Fotis, Kalivas, Grigorios
Format: Article
Language:English
Subjects:
frequency synthesizer
injection-locked oscillator
locking range
phase noise
subharmonic injection-locked phase-locked loop
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Summary:This work introduces a modified subharmonic injection‐locked phase‐locked loop (S‐ILPLL) that feeds the phase comparator with half the frequency of the voltage‐controlled oscillator by employing a divider in the loop feedback path. The main objective is to address the phase noise improvement of subharmonic ILPLLs, especially for the 5‐GHz band. Theoretical analysis and computer calculations demonstrate an improved performance for phase noise and power consumption. An experimental prototype was implemented to verify the validity of the proposed approach. Measurement results are in good agreement with computer calculations, thus the proposed S‐ILPLL can constitute an attractive design approach for 5‐GHz WLAN synthesizers. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2158–2162, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21888
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.21888