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Improved switched tuning of differential CMOS VCOs

Sjöland, Henrik LU orcid (2002) In IEEE Transactions on Circuits and Systems - 2, Analog and Digital Signal Processing 49(5). p.352-355
Abstract
Varactors for continuous frequency tuning are typically used in LC-oscillators. However, they have some drawbacks for large tuning-ranges, such as high tuning sensitivity causing high sensitivity to noise and disturbances on the control voltage. Furthermore, large metal-oxide-semiconductor (MOS) varactors have high conversion of harmless amplitude noise into harmful phase noise. To reduce these problems a small varactor can be used in combination with MOS-transistors that switch fixed capacitors in and out of the oscillator. The limitations due to the imperfect complementary metal-oxide-semiconductor (CMOS) switches are investigated, and an improved structure for use with the popular differential CMOS LC-oscillator is presented.
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
complementary metal-oxide-semiconductor, differential, frequency tuning, oscillator, switched tuning, RF CMOS, (CMOS), varactor, voltage-controlled oscillator (VCO)
in
IEEE Transactions on Circuits and Systems - 2, Analog and Digital Signal Processing
volume
49
issue
5
pages
352 - 355
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • wos:000177626600006
  • scopus:0036583736
ISSN
1057-7130
DOI
10.1109/TCSII.2002.801415
language
English
LU publication?
yes
id
3ece31cd-51ee-497f-86f7-af3dc4581ed2 (old id 330085)
date added to LUP
2016-04-01 16:07:37
date last changed
2025-04-04 14:52:38
@article{3ece31cd-51ee-497f-86f7-af3dc4581ed2,
  abstract     = {{Varactors for continuous frequency tuning are typically used in LC-oscillators. However, they have some drawbacks for large tuning-ranges, such as high tuning sensitivity causing high sensitivity to noise and disturbances on the control voltage. Furthermore, large metal-oxide-semiconductor (MOS) varactors have high conversion of harmless amplitude noise into harmful phase noise. To reduce these problems a small varactor can be used in combination with MOS-transistors that switch fixed capacitors in and out of the oscillator. The limitations due to the imperfect complementary metal-oxide-semiconductor (CMOS) switches are investigated, and an improved structure for use with the popular differential CMOS LC-oscillator is presented.}},
  author       = {{Sjöland, Henrik}},
  issn         = {{1057-7130}},
  keywords     = {{complementary metal-oxide-semiconductor; differential; frequency tuning; oscillator; switched tuning; RF CMOS; (CMOS); varactor; voltage-controlled oscillator (VCO)}},
  language     = {{eng}},
  number       = {{5}},
  pages        = {{352--355}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  series       = {{IEEE Transactions on Circuits and Systems - 2, Analog and Digital Signal Processing}},
  title        = {{Improved switched tuning of differential CMOS VCOs}},
  url          = {{http://dx.doi.org/10.1109/TCSII.2002.801415}},
  doi          = {{10.1109/TCSII.2002.801415}},
  volume       = {{49}},
  year         = {{2002}},
}