Patent ID: 7827864
Filing Date: 2010-11-09
Classification: G01C

Abstract:
1. A microelectromechanical gyroscope comprising: a microstructure, including a first mass and a second mass, wherein the first mass is oscillatable about a first axis with a resonance frequency and the second mass is constrained to the first mass so as to be drawn along by the first mass about the first axis and to oscillate about a second axis in response to a rotation of the microstructure; and a driving device, coupled to the microstructure so as to form a feedback control loop that includes the first mass and configured to maintain the first mass in oscillation at the resonance frequency, the driving device comprising a trans-conductance amplifier that generates detection voltages followed by a low-pass filter having a passband of frequencies and transfer function such that the resonance frequency is in the passband and a disturbance frequency associated with disturbance signals due to electrical coupling between the first mass and the second mass is not in the passband, the low-pass filter followed by a derivative stage having a transfer function that eliminates offsets, including offsets introduced by the trans-conductance amplifier.