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Class-D CMOS Oscillators

Fanori, Luca LU and Andreani, Pietro LU (2013) In IEEE Journal of Solid-State Circuits 48(12). p.3105-3119
Abstract
This paper presents class-D CMOS oscillators capable of an excellent phase noise performance from a very low power supply voltage. Starting from the recognition of the time-variant nature of the class-D LC tank, accurate expressions of the oscillation frequency, oscillation amplitude, current consumption, phase noise, and figure-of-merit (FoM) have been derived. Compared with the commonly used class-B/C architectures, the optimal class-D oscillator produces less phase noise for the same power consumption, at the expense of a higher power supply pushing. A prototype of a class-D voltage-controlled oscillator (VCO) targeted for mobile applications, implemented in a standard 65-nm CMOS process, covers a 46% tuning range between 3.0 and 4.8... (More)
This paper presents class-D CMOS oscillators capable of an excellent phase noise performance from a very low power supply voltage. Starting from the recognition of the time-variant nature of the class-D LC tank, accurate expressions of the oscillation frequency, oscillation amplitude, current consumption, phase noise, and figure-of-merit (FoM) have been derived. Compared with the commonly used class-B/C architectures, the optimal class-D oscillator produces less phase noise for the same power consumption, at the expense of a higher power supply pushing. A prototype of a class-D voltage-controlled oscillator (VCO) targeted for mobile applications, implemented in a standard 65-nm CMOS process, covers a 46% tuning range between 3.0 and 4.8 GHz; drawing 10 mA from 0.4 V, the phase noise at 10-MHz offset from 4.8 GHz is -143.5 dBc/Hz, for an FoM of 191 dBc/Hz with less than 1-dB variation across the tuning range. A version of the same VCO with a resonant tail filter displays a lower 1/f(3) phase-noise corner and improves the FoM by 1 dB. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Class-D, CMOS, high efficiency, low phase noise, low-voltage, voltage-controlled oscillator (VCO)
in
IEEE Journal of Solid-State Circuits
volume
48
issue
12
pages
3105 - 3119
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • wos:000327548900016
  • scopus:84889666619
ISSN
0018-9200
DOI
10.1109/JSSC.2013.2271531
language
English
LU publication?
yes
id
9ca1b830-38aa-450f-b8b5-bb347c28500c (old id 4273074)
date added to LUP
2016-04-01 13:07:10
date last changed
2020-01-15 03:11:51
@article{9ca1b830-38aa-450f-b8b5-bb347c28500c,
  abstract     = {This paper presents class-D CMOS oscillators capable of an excellent phase noise performance from a very low power supply voltage. Starting from the recognition of the time-variant nature of the class-D LC tank, accurate expressions of the oscillation frequency, oscillation amplitude, current consumption, phase noise, and figure-of-merit (FoM) have been derived. Compared with the commonly used class-B/C architectures, the optimal class-D oscillator produces less phase noise for the same power consumption, at the expense of a higher power supply pushing. A prototype of a class-D voltage-controlled oscillator (VCO) targeted for mobile applications, implemented in a standard 65-nm CMOS process, covers a 46% tuning range between 3.0 and 4.8 GHz; drawing 10 mA from 0.4 V, the phase noise at 10-MHz offset from 4.8 GHz is -143.5 dBc/Hz, for an FoM of 191 dBc/Hz with less than 1-dB variation across the tuning range. A version of the same VCO with a resonant tail filter displays a lower 1/f(3) phase-noise corner and improves the FoM by 1 dB.},
  author       = {Fanori, Luca and Andreani, Pietro},
  issn         = {0018-9200},
  language     = {eng},
  number       = {12},
  pages        = {3105--3119},
  publisher    = {IEEE - Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Journal of Solid-State Circuits},
  title        = {Class-D CMOS Oscillators},
  url          = {http://dx.doi.org/10.1109/JSSC.2013.2271531},
  doi          = {10.1109/JSSC.2013.2271531},
  volume       = {48},
  year         = {2013},
}