- J. Liu and D. T. Martin and T. Nishida and L. N. Cattafesta and M. Sheplak and B. P. Mann, Harmonic balance Nonlinear identification of a capacitive dual-backplate MEMS microphone,
Journal Of Microelectromechanical Systems, vol. 17 no. 3
pp. 698 -- 708 .
(last updated on 2009/08/04)
This paper describes the application of a nonlinear identification method to extract model parameters from the steady-state response of a capacitive dual-backplate microelectromechanical systems microphone. The microphone is modeled as a single-degree-of-freedom second-order system with both electrostatic and mechanical nonlinearities. A harmonic balance approach is applied to the nonlinear governing equation to obtain a set of algebraic equations that relate the unknown system parameters to the steady-state response of the microphone. Numerical simulations of the governing equation are also performed, using theoretical system parameters, to validate the accuracy of the harmonic balance solution for a weakly nonlinear microphone system with low damping. Finally, the microphone is experimentally characterized by extracting the system parameters from the response amplitude and phase relationships of the experimental data.