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A 5-GHz quadrature LC oscillator has been realized, in which the two LC stages are coupled with phase shifters. Analysis on the behavioral level shows that an N-stage LC oscillator is optimally coupled when each stage is connected with phase shifters providing ±180°/N phase shift. Simulation of the 5-GHz two-stage quadrature LC oscillator reveals a 4.3-dB reduction in phase noise compared to a quadrature LC oscillator without phase shifters. Measurements of the 5-GHz quadrature LC oscillator, made in a 30-GHz f T process, show a phase noise lower than -113 dBc/Hz, with a resonator quality factor of only 4 and an oscillator core power dissipation of 21.2 mW
Published in:
Solid-State Circuits, IEEE Journal of
(Volume:37
,
Issue:
5
)
Date of Publication: May 2002
- Page(s):
- 657 - 661
- ISSN :
- 0018-9200
- INSPEC Accession Number:
- 7257606
- Digital Object Identifier :
- 10.1109/4.997861
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 07 August 2002
- Issue Date :
- May 2002
- Sponsored by :
- IEEE Solid-State Circuits Society
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