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Improved switched tuning of differential CMOS VCOs

Sjöland, Henrik LU (2002) In IEEE Transactions on Circuits and Systems - 2, Analog and Digital Signal Processing1992-01-01+01:002004-01-01+01:00 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.
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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 Processing1992-01-01+01:002004-01-01+01:00
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
2007-11-14 12:32:51
date last changed
2018-03-11 04:08:03
@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},
  keyword      = {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 Processing1992-01-01+01:002004-01-01+01:00},
  title        = {Improved switched tuning of differential CMOS VCOs},
  url          = {http://dx.doi.org/10.1109/TCSII.2002.801415},
  volume       = {49},
  year         = {2002},
}