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A filtering technique to lower LC oscillator phase noise

Författare:
Publiceringsår: 2001
Språk: Engelska
Sidor: 1921-1930
Publikation/Tidskrift/Serie: IEEE Journal of Solid-State Circuits
Volym: 36
Nummer: 12
Dokumenttyp: Artikel i tidskrift
Förlag: IEEE--Institute of Electrical and Electronics Engineers Inc.

Sammanfattning

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.

Nyckelord

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

Övriga

Published
  • Elektronikkonstruktion-lup-obsolete
  • ISSN: 0018-9200

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