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A study of phase noise in colpitts and LC-tank CMOS oscillators

Andreani, Pietro LU ; Wang, Xiaoyan; Vandi, Luca and Fard, Ali (2005) In IEEE Journal of Solid-State Circuits 40(5). p.1107-1118
Abstract
This paper presents a study of phase noise in CMOS Colpitts and LC-tank oscillators. Closed-form symbolic formulas for the 1/f/sup 2/ phase-noise region are derived for both the Colpitts oscillator (either single-ended or differential) and the LC-tank oscillator, yielding highly accurate results under very general assumptions. A comparison between the differential Colpitts and the LC-tank oscillator is also carried out, which shows that the latter is capable of a 2-dB lower phase-noise figure-of-merit (FoM) when simplified oscillator designs and ideal MOS models are adopted. Several prototypes of both Colpitts and LC-tank oscillators have been implemented in a 0.35-/spl mu/m CMOS process. The best performance of the LC-tank oscillators... (More)
This paper presents a study of phase noise in CMOS Colpitts and LC-tank oscillators. Closed-form symbolic formulas for the 1/f/sup 2/ phase-noise region are derived for both the Colpitts oscillator (either single-ended or differential) and the LC-tank oscillator, yielding highly accurate results under very general assumptions. A comparison between the differential Colpitts and the LC-tank oscillator is also carried out, which shows that the latter is capable of a 2-dB lower phase-noise figure-of-merit (FoM) when simplified oscillator designs and ideal MOS models are adopted. Several prototypes of both Colpitts and LC-tank oscillators have been implemented in a 0.35-/spl mu/m CMOS process. The best performance of the LC-tank oscillators shows a phase noise of -142dBc/Hz at 3-MHz offset frequency from a 2.9-GHz carrier with a 16-mW power consumption, resulting in an excellent FoM of /spl sim/189 dBc/Hz. For the same oscillation frequency, the FoM displayed by the differential Colpitts oscillators is /spl sim/5 dB lower. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
IEEE Journal of Solid-State Circuits
volume
40
issue
5
pages
1107 - 1118
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • scopus:18444372911
ISSN
0018-9200
DOI
10.1109/JSSC.2005.845991
language
English
LU publication?
no
id
e872d195-f5f2-4602-8620-097cc085e948 (old id 1049718)
date added to LUP
2008-03-20 12:10:54
date last changed
2017-10-22 04:32:21
@article{e872d195-f5f2-4602-8620-097cc085e948,
  abstract     = {This paper presents a study of phase noise in CMOS Colpitts and LC-tank oscillators. Closed-form symbolic formulas for the 1/f/sup 2/ phase-noise region are derived for both the Colpitts oscillator (either single-ended or differential) and the LC-tank oscillator, yielding highly accurate results under very general assumptions. A comparison between the differential Colpitts and the LC-tank oscillator is also carried out, which shows that the latter is capable of a 2-dB lower phase-noise figure-of-merit (FoM) when simplified oscillator designs and ideal MOS models are adopted. Several prototypes of both Colpitts and LC-tank oscillators have been implemented in a 0.35-/spl mu/m CMOS process. The best performance of the LC-tank oscillators shows a phase noise of -142dBc/Hz at 3-MHz offset frequency from a 2.9-GHz carrier with a 16-mW power consumption, resulting in an excellent FoM of /spl sim/189 dBc/Hz. For the same oscillation frequency, the FoM displayed by the differential Colpitts oscillators is /spl sim/5 dB lower.},
  author       = {Andreani, Pietro and Wang, Xiaoyan and Vandi, Luca and Fard, Ali},
  issn         = {0018-9200},
  language     = {eng},
  number       = {5},
  pages        = {1107--1118},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Journal of Solid-State Circuits},
  title        = {A study of phase noise in colpitts and LC-tank CMOS oscillators},
  url          = {http://dx.doi.org/10.1109/JSSC.2005.845991},
  volume       = {40},
  year         = {2005},
}