Dielectric charge control in electrostatic MEMS positioners/varactors
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A new dynamical closed-loop method is proposed to control dielectric charging in capacitive microelectromechanical systems (MEMS) positioners/varactors for enhanced reliability and robustness. Instead of adjusting the magnitude of the control voltage to compensate the drift caused by the dielectric charge, the method uses a feedback loop to maintain it at a desired level: the device capacitance is periodically sampled, and bipolar pulses of constant magnitude are applied. Specific models describing the dynamics of charge and a control map are introduced. Validation of the proposed method is accomplished both through discrete-time simulations and with experiments using MEMS devices that suffer from dielectric charging.
CitationBlokhina, E. [et al.]. Dielectric charge control in electrostatic MEMS positioners/varactors. "Journal of microelectromechanical systems", Juny 2012, vol. 21, núm. 3, p. 559-573.
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