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Full oscillation cycle phase noise analysis of differential CMOS LC oscillators

Troedsson, Niklas LU and Sjöland, Henrik LU (2006) In Analog Integrated Circuits and Signal Processing 48(3). p.211-222
Abstract
This paper analyzes the phase noise of the widely used differential LC oscillator topology and presents brief equations describing phase noise over the entire oscillation period. The findings show that if a capacitance is present at the source node of the differential pair, two phenomena occur that increase the phase noise: the switch time increases, lengthening the interval spent in a noisy balanced state and increasing the transistor noise excess factor; and at higher frequencies the unbalanced state starts to contribute phase noise. The analysis is based upon the superposition of piecewise linear equations using the EKV transistor model, which includes a concise formulation of the noise excess factor.
Please use this url to cite or link to this publication:
author
and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CMOS, voltage controlled oscillators, phase noise
in
Analog Integrated Circuits and Signal Processing
volume
48
issue
3
pages
211 - 222
publisher
Springer
external identifiers
  • wos:000239743600006
  • scopus:33747156369
ISSN
0925-1030
DOI
10.1007/s10470-006-7632-9
language
English
LU publication?
yes
id
03bb3925-0faa-4c4b-b94f-8381179890a0 (old id 398573)
date added to LUP
2016-04-01 16:41:26
date last changed
2021-06-23 04:25:09
@article{03bb3925-0faa-4c4b-b94f-8381179890a0,
  abstract     = {This paper analyzes the phase noise of the widely used differential LC oscillator topology and presents brief equations describing phase noise over the entire oscillation period. The findings show that if a capacitance is present at the source node of the differential pair, two phenomena occur that increase the phase noise: the switch time increases, lengthening the interval spent in a noisy balanced state and increasing the transistor noise excess factor; and at higher frequencies the unbalanced state starts to contribute phase noise. The analysis is based upon the superposition of piecewise linear equations using the EKV transistor model, which includes a concise formulation of the noise excess factor.},
  author       = {Troedsson, Niklas and Sjöland, Henrik},
  issn         = {0925-1030},
  language     = {eng},
  number       = {3},
  pages        = {211--222},
  publisher    = {Springer},
  series       = {Analog Integrated Circuits and Signal Processing},
  title        = {Full oscillation cycle phase noise analysis of differential CMOS LC oscillators},
  url          = {http://dx.doi.org/10.1007/s10470-006-7632-9},
  doi          = {10.1007/s10470-006-7632-9},
  volume       = {48},
  year         = {2006},
}