Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Feedback-induced phase noise in microcantilever-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 under feedback fFB = f0 ± ¿f differ. This not only gives a wrong measurement of f0 due to the feedback-induced error ± ¿f, but also degrades the performances of oscillating loops. The static frequency shift ¿f appearing in constant-gain loops due to feedback forces in phase with z(t) becomes a frequency noise when the loop gain changes randomly as in oscillating loops by the action of noise on the gain limiter of the loop. This is the source of phase noise this paper reveals for the first time that can be summarized by this sentence: the imperfect actuation of feedback loops in cantilever-based oscillators is a source of their phase noise. We show how to reduce this noise by a tight phase control in the loop gain to drive cantilevers by forces exactly in quadrature respect to their instantaneous displacement z(t).
International
Si
JCR
Si
Title
SENSORS AND ACTUATORS A-PHYSICAL
ISBN
0924-4247
Impact factor JCR
1,724
Impact info
Volume
155
Journal number
0
From page
188
To page
194
Month
ENERO
Ranking
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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