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Memorias de investigación
Communications at congresses:
Feedback-induced Phase noise in resonator-based oscillators
Year:2009
Research Areas
  • Electronics engineering
Information
Abstract
When electronic feedback is used around resonant microcantilevers, their native resonance frequency f0 and that of the feedback loop fFB=f0±¿f will differ in general because the 0º or 360º phase condition aimed in the loop gain uses to have some small phase offset ¿¿. This feedback-induced frequency shift ¿f, that is static in constant-gain loops, becomes a frequency noise when the loop gain changes randomly as in oscillating loops by the action of noise on the Automatic Level Control (ALC) of the loop. The phase offset ¿¿ allows the ALC to modulate randomly the output frequency around its fFB value while it modulates in the same manner the feedback factor of the loop to keep constant the output amplitude. This phenomenon is thus an added source of phase noise in resonator-based oscillators, especially when the signals within the loop are noisy as those giving the instantaneous displacement of small microdevices like resonant MEMS (Micro- Electro-Mechanical Systems).
International
No
Congress
XXIV Conference on Design of Circuits and Integrated Systems
960
Place
Zaragoza
Reviewers
Si
ISBN/ISSN
978-84-690-4144-4
Start Date
18/11/2009
End Date
20/11/2009
From page
231
To page
236
Proc. of the DCIS'09
Participants
  • Autor: Javier Malo Gomez (UPM)
  • Autor: Jose Ignacio Izpura Torres (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Microsistemas y Materiales Electrónicos
  • Departamento: Sistemas Electrónicos y de Control
  • Departamento: Ingeniería Electrónica
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