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A 12-GHz Reconfigurable Multicore CMOS DCO, With a Time-Variant Analysis of the Impact of Reconfiguration Switches on Phase Noise

Tomasin, Lorenzo ; Andreani, Pietro LU ; Boi, Giovanni ; Padovan, Fabio and Bevilacqua, Andrea (2022) In IEEE Journal of Solid-State Circuits 57(9). p.2802-2811
Abstract

This article introduces a 28-nm CMOS digitally controlled oscillator (DCO) based on eight oscillator cores, where the number of active cores can be reconfigured to be either 2, 4, 6, or 8, trading power consumption for phase noise without incurring an additional phase noise penalty. The impact of the reconfiguration pMOS switches on the phase noise performance is determined through a simple yet rigorous time-variant circuit analysis. The octa-core DCO covers a 27% frequency tuning range between 10.7 and 14.1 GHz with an average resolution of 6 MHz. A very low phase noise level of -126 dBc/Hz is measured at 1-MHz offset from 10.7 GHz with a power consumption of 173 mW, corresponding to a phase-noise figure-of-merit of -184... (More)

This article introduces a 28-nm CMOS digitally controlled oscillator (DCO) based on eight oscillator cores, where the number of active cores can be reconfigured to be either 2, 4, 6, or 8, trading power consumption for phase noise without incurring an additional phase noise penalty. The impact of the reconfiguration pMOS switches on the phase noise performance is determined through a simple yet rigorous time-variant circuit analysis. The octa-core DCO covers a 27% frequency tuning range between 10.7 and 14.1 GHz with an average resolution of 6 MHz. A very low phase noise level of -126 dBc/Hz is measured at 1-MHz offset from 10.7 GHz with a power consumption of 173 mW, corresponding to a phase-noise figure-of-merit of -184 dBc/Hz that remains almost constant across the tuning range.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CMOS, Couplings, digitally controlled oscillator (DCO), Impedance, multicore oscillator, Multicore processing, Oscillators, Phase noise, phase noise., Power demand, Switches
in
IEEE Journal of Solid-State Circuits
volume
57
issue
9
pages
2802 - 2811
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • scopus:85129650885
ISSN
0018-9200
DOI
10.1109/JSSC.2022.3167109
language
English
LU publication?
yes
id
89d32eb0-f6a0-4580-92ba-3c836f5d416f
date added to LUP
2022-08-15 09:17:03
date last changed
2023-11-21 10:18:13
@article{89d32eb0-f6a0-4580-92ba-3c836f5d416f,
  abstract     = {{<p>This article introduces a 28-nm CMOS digitally controlled oscillator (DCO) based on eight oscillator cores, where the number of active cores can be reconfigured to be either 2, 4, 6, or 8, trading power consumption for phase noise without incurring an additional phase noise penalty. The impact of the reconfiguration pMOS switches on the phase noise performance is determined through a simple yet rigorous time-variant circuit analysis. The octa-core DCO covers a 27&amp;#x0025; frequency tuning range between 10.7 and 14.1 GHz with an average resolution of 6 MHz. A very low phase noise level of -126 dBc/Hz is measured at 1-MHz offset from 10.7 GHz with a power consumption of 173 mW, corresponding to a phase-noise figure-of-merit of -184 dBc/Hz that remains almost constant across the tuning range.</p>}},
  author       = {{Tomasin, Lorenzo and Andreani, Pietro and Boi, Giovanni and Padovan, Fabio and Bevilacqua, Andrea}},
  issn         = {{0018-9200}},
  keywords     = {{CMOS; Couplings; digitally controlled oscillator (DCO); Impedance; multicore oscillator; Multicore processing; Oscillators; Phase noise; phase noise.; Power demand; Switches}},
  language     = {{eng}},
  number       = {{9}},
  pages        = {{2802--2811}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  series       = {{IEEE Journal of Solid-State Circuits}},
  title        = {{A 12-GHz Reconfigurable Multicore CMOS DCO, With a Time-Variant Analysis of the Impact of Reconfiguration Switches on Phase Noise}},
  url          = {{http://dx.doi.org/10.1109/JSSC.2022.3167109}},
  doi          = {{10.1109/JSSC.2022.3167109}},
  volume       = {{57}},
  year         = {{2022}},
}