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A Power-Scalable DCO for Multi-Standard GSM/WCDMA Frequency Synthesizers

Liscidini, Antonio; Fanori, Luca; Andreani, Pietro LU and Castello, Rinaldo (2014) In IEEE Journal of Solid-State Circuits 49(3). p.646-656
Abstract
A Digitally Controlled Oscillator (DCO) whose power consumption can be reconfigured while maintaining an almost constant phase-noise figure-of-merit (FoM). This is achieved by using either a single-switch-pair or a complementary (i.e., double-switch-pair) oscillator topology, without disturbing the optimized LC tank of the DCO. The optimal power consumption in the complementary (P-N) configuration is reduced by 75% compared to the single-switch-pair (N-only) configuration, while the FoM is kept constant. Measurements on a 55 nm CMOS 4 GHz DCO prototype show a minimum phase noise of -129.3 dBc/Hz at 2 MHz offset from the carrier in the P-N configuration, and of -134.7 dBc/Hz in the N-only configuration, with a phase noise difference very... (More)
A Digitally Controlled Oscillator (DCO) whose power consumption can be reconfigured while maintaining an almost constant phase-noise figure-of-merit (FoM). This is achieved by using either a single-switch-pair or a complementary (i.e., double-switch-pair) oscillator topology, without disturbing the optimized LC tank of the DCO. The optimal power consumption in the complementary (P-N) configuration is reduced by 75% compared to the single-switch-pair (N-only) configuration, while the FoM is kept constant. Measurements on a 55 nm CMOS 4 GHz DCO prototype show a minimum phase noise of -129.3 dBc/Hz at 2 MHz offset from the carrier in the P-N configuration, and of -134.7 dBc/Hz in the N-only configuration, with a phase noise difference very close to the 6 dB expected from theory. The current consumption is 6 mA and 24 mA, respectively, resulting in approximately the same FoM of -185 dBc/Hz. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
WCDMA, reconfigurability, reconfigurable, power scalable, phase noise, oscillator, DCO, GSM
in
IEEE Journal of Solid-State Circuits
volume
49
issue
3
pages
646 - 656
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • wos:000332765200007
  • scopus:84898600842
ISSN
0018-9200
DOI
10.1109/JSSC.2014.2302292
language
English
LU publication?
yes
id
bd3bbff3-0265-45b7-af27-f69ca9ac72d0 (old id 4414309)
date added to LUP
2014-04-30 07:50:30
date last changed
2017-09-10 04:04:09
@article{bd3bbff3-0265-45b7-af27-f69ca9ac72d0,
  abstract     = {A Digitally Controlled Oscillator (DCO) whose power consumption can be reconfigured while maintaining an almost constant phase-noise figure-of-merit (FoM). This is achieved by using either a single-switch-pair or a complementary (i.e., double-switch-pair) oscillator topology, without disturbing the optimized LC tank of the DCO. The optimal power consumption in the complementary (P-N) configuration is reduced by 75% compared to the single-switch-pair (N-only) configuration, while the FoM is kept constant. Measurements on a 55 nm CMOS 4 GHz DCO prototype show a minimum phase noise of -129.3 dBc/Hz at 2 MHz offset from the carrier in the P-N configuration, and of -134.7 dBc/Hz in the N-only configuration, with a phase noise difference very close to the 6 dB expected from theory. The current consumption is 6 mA and 24 mA, respectively, resulting in approximately the same FoM of -185 dBc/Hz.},
  author       = {Liscidini, Antonio and Fanori, Luca and Andreani, Pietro and Castello, Rinaldo},
  issn         = {0018-9200},
  keyword      = {WCDMA,reconfigurability,reconfigurable,power scalable,phase noise,oscillator,DCO,GSM},
  language     = {eng},
  number       = {3},
  pages        = {646--656},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Journal of Solid-State Circuits},
  title        = {A Power-Scalable DCO for Multi-Standard GSM/WCDMA Frequency Synthesizers},
  url          = {http://dx.doi.org/10.1109/JSSC.2014.2302292},
  volume       = {49},
  year         = {2014},
}