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Proceedings Paper

Architecture-level center frequency drift compensation method for micromechanical filters used in IF stages of wireless telecommunication receivers
Author(s): Olivier Billoint; Dimitri Galayko; Bernard Legrand; Andreas Kaiser
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Paper Abstract

A prototype of a 433.92 MHZRF receiver using a micro- mechanical resonator as channel-selection filter in the 2nd IF stage has been realized (94.5 kHz center frequency, 20 Hz bandwidth). A novel approach is used for managing the temperature drift of the center frequency of the micro-mechanical filter. Instead of stabilizing the filter's center frequency by complex device-level and technological modifications (bias voltage tuning, mechanical or thermal compensation), we modified the architecture of the IF stage in order to continuously adapt the IF frequency to the filter's center frequency deviations. This is achieved by periodical real-time measurements of the filter's center frequency and by then generating the appropriate second LO frequency. The measurement of the center frequency is achieved by putting the filter in an oscillating closed loop. The measured relative matching error between the 2nd IF frequency and the filter's center frequency is better than 0.005%.

Paper Details

Date Published: 19 April 2002
PDF: 7 pages
Proc. SPIE 4755, Design, Test, Integration, and Packaging of MEMS/MOEMS 2002, (19 April 2002); doi: 10.1117/12.462803
Show Author Affiliations
Olivier Billoint, IEMN-IESN/CNRS (France)
Dimitri Galayko, IEMN-IESN/CNRS (France)
Bernard Legrand, IEMN-IESN/CNRS (France)
Andreas Kaiser, IEMN-IESN/CNRS (France)

Published in SPIE Proceedings Vol. 4755:
Design, Test, Integration, and Packaging of MEMS/MOEMS 2002
Bernard Courtois; Jean Michel Karam; Karen W. Markus; Bernd Michel; Tamal Mukherjee; James A. Walker, Editor(s)

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