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01-Applied Mathematics & Information Sciences
An International Journal
               
 
 
 
 
 
 
 
 
 
 
 

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Volumes > Volume 9 > No. 2

 
   

Modelling and Simulation of the Effect of Air Damping on the Frequency and Quality factor of a CMOS-MEMS Resonator

PP: 729-737
Author(s)
J. O. Dennis, A. Y. Ahmed, M. H. Md. Khir, A. A. S. Rabih,
Abstract
This paper reports analytical modeling and finite element analysis (FEA) of the effect of two types of air damping (squeeze film and slide film damping) on resonance frequency and quality factor of a multi-layer CMOS-MEMS resonator designed for application as a mass sensitive gas sensor. The sensing principle is based on change in frequency or amplitude of the resonator due to adsorption/absorption of trace gases onto an active material to be deposited on the resonator membrane plate. The effect of air damping for mode 1 and mode 2 are investigated and the damping coefficient is found to increase from 0.922 10−6 Ns/m to 1.768 10−6 Ns/m for mode 1 and from 0.914 10−6 Ns/m to 1.708 10−6 Ns/m for mode 2 with increase in the overlap area of the fingers from 40 mm to 75 mm, respectively. The quality factor (Q) of the CMOS-MEMS resonator is found to decrease with increasing damping coefficient for both modes of vibration while the frequency remained unaffected. Analytical and simulation results shows good agreement for damping coefficient (1.43 % and 1.22 %), resonant frequency (3.45 % and 4.4 %) and quality factor (2.27 % and 0.88 %) for mode 1 and 2, respectively.

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