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A filtering technique to lower LC oscillator phase noise

Author

Summary, in English

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.

Publishing year

2001

Language

English

Pages

1921-1930

Publication/Series

IEEE Journal of Solid-State Circuits

Volume

36

Issue

12

Document type

Journal article

Publisher

IEEE - Institute of Electrical and Electronics Engineers Inc.

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering

Keywords

  • UHF oscillators
  • passive filters
  • phase noise
  • voltage-controlled oscillators

Status

Published

Research group

  • Elektronikkonstruktion

ISBN/ISSN/Other

  • ISSN: 0018-9200