Analysis and design of an optimally coupled 5-GHz quadrature LC oscillator

J.D. Tang, van der, P.W.J. van de Ven, D. Kasperkovitz, A.H.M. Roermund, van

Research output: Contribution to journalArticleAcademicpeer-review

133 Citations (Scopus)
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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
Original languageEnglish
Pages (from-to)657-661
Number of pages5
JournalIEEE Journal of Solid-State Circuits
Issue number5
Publication statusPublished - 2002


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