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

Wismar, Ulrik; Wisland, Dag and Andreani, Pietro LU (2005) In 23rd NORCHIP Conference, 2005. p.145-148
Abstract
Frequency modulation in ring VCOs is investigated. Primarily, the linearity of conversion from input voltage to output frequency is considered. Bulk-voltage control of the threshold voltage of the VCO transistors is found to be a very promising approach for applications in frequency /spl Delta//spl Sigma/ converters. Different approaches apply in presence of high supply voltages, when transistors work in strong inversion, compared to low supply voltages, when transistors are in weak inversion. In strong inversion, second-order effects controlled by the supply voltage linearize the VCO modulation, while in weak inversion an improved linearity can be obtained using soft rails, at the expense of a reduced sensitivity.
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author
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
23rd NORCHIP Conference, 2005.
pages
145 - 148
external identifiers
  • scopus:33847188105
ISBN
1-4244-0064-3
DOI
10.1109/NORCHP.2005.1597010
language
English
LU publication?
no
id
7eff3ec7-2f2b-4944-8a3b-fc04171d26ec (old id 1051208)
alternative location
http://ieeexplore.ieee.org/iel5/10643/33584/01597010.pdf?tp=&isnumber=33584&arnumber=1597010&punumber=10643
date added to LUP
2008-04-01 13:06:31
date last changed
2017-03-12 04:31:10
@inproceedings{7eff3ec7-2f2b-4944-8a3b-fc04171d26ec,
  abstract     = {Frequency modulation in ring VCOs is investigated. Primarily, the linearity of conversion from input voltage to output frequency is considered. Bulk-voltage control of the threshold voltage of the VCO transistors is found to be a very promising approach for applications in frequency /spl Delta//spl Sigma/ converters. Different approaches apply in presence of high supply voltages, when transistors work in strong inversion, compared to low supply voltages, when transistors are in weak inversion. In strong inversion, second-order effects controlled by the supply voltage linearize the VCO modulation, while in weak inversion an improved linearity can be obtained using soft rails, at the expense of a reduced sensitivity.},
  author       = {Wismar, Ulrik and Wisland, Dag and Andreani, Pietro},
  booktitle    = {23rd NORCHIP Conference, 2005.},
  isbn         = {1-4244-0064-3},
  language     = {eng},
  pages        = {145--148},
  title        = {Linearity of bulk-controlled inverter ring VCO in weak and strong inversion},
  url          = {http://dx.doi.org/10.1109/NORCHP.2005.1597010},
  year         = {2005},
}