Patent ID: 8094841
Filing Date: 2012-01-10
Classification: G01C,H03H,H04R

Abstract:
1. A capacitive detection method in a MEMS resonator comprising: vibrating a resonator with a drive signal; sensing vibration of the resonator by detecting a plurality of sidebands of an electromechanical amplitude modulation signal in a capacitive detector; and extracting amplitude of motion from a ratio of two simultaneously sensed sidebands of different order, where ω where sensing vibration of the resonator by detecting a plurality of sidebands of an electromechanical amplitude modulation signal in a capacitive detector comprises detecting amplitudes of first order sidebands at frequencies ω where extracting amplitude of motion from a ratio of two simultaneously sensed sidebands of different order comprises calculating a ratio of amplitudes using or estimate using a single side pair of sidebands using and calculating normalized amplitude of motion