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
Full text
- Available as PDF - 255 kB
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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