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Proceedings Paper

Frequency response of piezoresistive-based MASA resonators with electrostatic vertical comb-drive actuation
Author(s): Harold L. Stalford; David S. Epp
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Paper Abstract

We report on experimental work that characterizes the frequency response of resonators of Microfabricated Acoustic Spectrum Analyzer (MASA) devices which were fabricated using Sandia's SUMMiT processing technology. A 1.1 micron silicon nitride layer was used in the fabrication to isolate the sense mechanism from the actuation mechanism. The devices are actuated using electrostatic vertical comb-drive actuation in a 30-50 mTorr vacuum and the frequency response is measured using a piezo-resistive readout mechanism. Two MASA devices are tested using comb-drive ac signals (e.g., 200mV) superimposed on a dc bias (e.g., 15V). In addition, dc bias voltages placed on the comb-drive are shown to tune the resonant frequency of the resonator. The frequency response of the piezo-resistive readout mechanism is measured using a 10V dc supply voltage supplied across its Wheatstone bridge. The results show that the piezo-resistive readout mechanism can detect resonant behavior and determine resonant frequency. A laser doppler vibrometer is used as an independent means to characterize the frequency response and verify the results.

Paper Details

Date Published: 22 January 2005
PDF: 8 pages
Proc. SPIE 5717, MEMS/MOEMS Components and Their Applications II, (22 January 2005); doi: 10.1117/12.590876
Show Author Affiliations
Harold L. Stalford, Sandia National Labs. (United States)
Univ. of Oklahoma (United States)
David S. Epp, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 5717:
MEMS/MOEMS Components and Their Applications II
Albert K. Henning, Editor(s)

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