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A filtering technique to lower LC oscillator phase noise

Publiceringsår: 2001
Språk: Engelska
Sidor: 1921-1930
Publikation/Tidskrift/Serie: Journal of Solid-State Circuits
Volym: 36
Nummer: 12
Dokumenttyp: Artikel
Förlag: IEEE


Based on a physical understanding of phase-noise mechanisms, a passive LC filter is found to lower the phase-noise factor in a differential oscillator to its fundamental minimum. Three fully integrated LC voltage-controlled oscillators (VCOs) serve as a proof of concept. Two 1.1-GHz VCOs achieve -153 dBc/Hz at 3 MHz offset, biased at 3.7 mA from 2.5 V. A 2.1-GHz VCO achieves -148 dBc/Hz at 15 MHz offset, taking 4 mA from a 2.7-V supply. All oscillators use fully integrated resonators, and the first two exceed discrete transistor modules in figure of merit. Practical aspects and repercussions of the technique are discussed.



  • Electrical Engineering, Electronic Engineering, Information Engineering
  • UHF oscillators
  • passive filters
  • phase noise
  • voltage-controlled oscillators


  • Elektronikkonstruktion
"©2001 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE."
  • ISSN: 0018-9200

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