Tail current noise suppression in RF CMOS VCOs
Author
Summary, in English
This paper presents the experimental results of two different techniques, inductive degeneration and capacitive filtering, for reducing the phase noise in tail-biased RF CMOS voltage-controlled oscillators (VCOs). Both techniques prevent the low-frequency tail current noise from being converted into phase noise. The techniques are applied to two distinct VCO designs, showing that the largest phase noise reduction (up to 6-7 dB at 3-MHz offset frequency from the carrier) is achieved via inductive degeneration. Capacitive filtering, however, also substantially reduces the phase noise at high offset frequencies and may therefore become a valid alternative to inductive degeneration, as discrete capacitors are of more common use than discrete inductors.
Publishing year
2002
Language
English
Pages
342-348
Publication/Series
IEEE Journal of Solid-State Circuits
Volume
37
Issue
3
Document type
Journal article
Publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
Topic
- Electrical Engineering, Electronic Engineering, Information Engineering
Keywords
- phase noise
- CMOS
- VCO
- RF
Status
Published
ISBN/ISSN/Other
- ISSN: 0018-9200