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Linearity of bulk-controlled inverter ring VCO in weak and strong inversion

Wismar, Ulrik; Wisland, Dag and Andreani, Pietro LU (2007) In Analog Integrated Circuits and Signal Processing 50(1). p.59-67
Abstract
In this paper linearity of frequency modulation in voltage controlled inverter ring oscillators for non feedback sigma delta converter applications is studied. The linearity is studied through theoretical models of the oscillator operating at supply voltages above and below the threshold voltage of a transistor, bringing the transistors in respectively strong and weak inversion. The theoretical results are tested with more advanced models through spectreRF simulations. A soft rail approach implemented to improve linearity in weak inversion is proposed and demonstrated. The influence from voltage noise, process variations and temperature variations have also been simulated to indicate the advantages of having the soft rail bias transistor... (More)
In this paper linearity of frequency modulation in voltage controlled inverter ring oscillators for non feedback sigma delta converter applications is studied. The linearity is studied through theoretical models of the oscillator operating at supply voltages above and below the threshold voltage of a transistor, bringing the transistors in respectively strong and weak inversion. The theoretical results are tested with more advanced models through spectreRF simulations. A soft rail approach implemented to improve linearity in weak inversion is proposed and demonstrated. The influence from voltage noise, process variations and temperature variations have also been simulated to indicate the advantages of having the soft rail bias transistor in the VCO. (Less)
Please use this url to cite or link to this publication:
author
publishing date
type
Contribution to journal
publication status
published
subject
in
Analog Integrated Circuits and Signal Processing
volume
50
issue
1
pages
59 - 67
publisher
Springer
external identifiers
  • Scopus:33845486492
ISSN
0925-1030
DOI
10.1007/s10470-006-9370-4
language
English
LU publication?
no
id
7772ce65-342e-46df-b435-ccb3cf5b78ac (old id 1051576)
alternative location
http://www.springerlink.com/content/n616085625812k41/fulltext.pdf
date added to LUP
2008-04-01 13:08:48
date last changed
2016-10-13 04:29:39
@misc{7772ce65-342e-46df-b435-ccb3cf5b78ac,
  abstract     = {In this paper linearity of frequency modulation in voltage controlled inverter ring oscillators for non feedback sigma delta converter applications is studied. The linearity is studied through theoretical models of the oscillator operating at supply voltages above and below the threshold voltage of a transistor, bringing the transistors in respectively strong and weak inversion. The theoretical results are tested with more advanced models through spectreRF simulations. A soft rail approach implemented to improve linearity in weak inversion is proposed and demonstrated. The influence from voltage noise, process variations and temperature variations have also been simulated to indicate the advantages of having the soft rail bias transistor in the VCO.},
  author       = {Wismar, Ulrik and Wisland, Dag and Andreani, Pietro},
  issn         = {0925-1030},
  language     = {eng},
  number       = {1},
  pages        = {59--67},
  publisher    = {ARRAY(0xd5d79f0)},
  series       = {Analog Integrated Circuits and Signal Processing},
  title        = {Linearity of bulk-controlled inverter ring VCO in weak and strong inversion},
  url          = {http://dx.doi.org/10.1007/s10470-006-9370-4},
  volume       = {50},
  year         = {2007},
}