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More on the 1/f2 Phase Noise Performance of CMOS Differential-Pair LC-Tank Oscillators

Andreani, Pietro LU and Fard, Ali (2006) In IEEE Journal of Solid-State Circuits 41(12). p.2703-2712
Abstract
This paper presents a rigorous phase noise analysis in the 1/f2 region for the differential CMOS LC-tank oscillator with both nMOS and pMOS switch pairs. A compact, closed-form phase noise equation is obtained, accounting for the noise contributions from both tank losses and transistors currents, which allows a robust comparison between LC oscillators built with either one or two switch pairs. The fabricated oscillator prototype is tunable between 2.15 and 2.35 GHz, and shows a phase noise of -144 dBc/Hz at 3 MHz offset from the 2.3 GHz carrier for a 4 mA bias current. The phase noise figure-of-merit is practically constant across the tuning range, with a minimum of 191.5 dBc/Hz. A reference single-switch-pair oscillator has been... (More)
This paper presents a rigorous phase noise analysis in the 1/f2 region for the differential CMOS LC-tank oscillator with both nMOS and pMOS switch pairs. A compact, closed-form phase noise equation is obtained, accounting for the noise contributions from both tank losses and transistors currents, which allows a robust comparison between LC oscillators built with either one or two switch pairs. The fabricated oscillator prototype is tunable between 2.15 and 2.35 GHz, and shows a phase noise of -144 dBc/Hz at 3 MHz offset from the 2.3 GHz carrier for a 4 mA bias current. The phase noise figure-of-merit is practically constant across the tuning range, with a minimum of 191.5 dBc/Hz. A reference single-switch-pair oscillator has been implemented and tested as well, and the difference between the phase noise levels displayed by the two oscillators is very nearly the one expected from theory (Less)
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author
and
publishing date
type
Contribution to journal
publication status
published
subject
in
IEEE Journal of Solid-State Circuits
volume
41
issue
12
pages
2703 - 2712
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • scopus:33845667295
ISSN
0018-9200
DOI
10.1109/JSSC.2006.884188
language
English
LU publication?
no
id
39a0fc52-8463-41f1-86a9-d227434b8e3c (old id 1049687)
date added to LUP
2016-04-01 16:42:35
date last changed
2022-04-22 23:50:32
@article{39a0fc52-8463-41f1-86a9-d227434b8e3c,
  abstract     = {{This paper presents a rigorous phase noise analysis in the 1/f2 region for the differential CMOS LC-tank oscillator with both nMOS and pMOS switch pairs. A compact, closed-form phase noise equation is obtained, accounting for the noise contributions from both tank losses and transistors currents, which allows a robust comparison between LC oscillators built with either one or two switch pairs. The fabricated oscillator prototype is tunable between 2.15 and 2.35 GHz, and shows a phase noise of -144 dBc/Hz at 3 MHz offset from the 2.3 GHz carrier for a 4 mA bias current. The phase noise figure-of-merit is practically constant across the tuning range, with a minimum of 191.5 dBc/Hz. A reference single-switch-pair oscillator has been implemented and tested as well, and the difference between the phase noise levels displayed by the two oscillators is very nearly the one expected from theory}},
  author       = {{Andreani, Pietro and Fard, Ali}},
  issn         = {{0018-9200}},
  language     = {{eng}},
  number       = {{12}},
  pages        = {{2703--2712}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  series       = {{IEEE Journal of Solid-State Circuits}},
  title        = {{More on the 1/f2 Phase Noise Performance of CMOS Differential-Pair LC-Tank Oscillators}},
  url          = {{http://dx.doi.org/10.1109/JSSC.2006.884188}},
  doi          = {{10.1109/JSSC.2006.884188}},
  volume       = {{41}},
  year         = {{2006}},
}