Abstract:
A micro-electro-mechanical gyroscope includes a first mass (107), which is able to oscillate along a first axis (X) with respect to a fixed body (109), and an inertial sensor (6), having a second mass (108), constrained to the first mass so as to oscillate along a second axis (Y), in response to a rotation of the gyroscope (100). A driving device (103), coupled to the first mass (107) forms a control loop (105) for maintaining the first mass (107) in oscillation at a resonance frequency. A reading device (104), which detects displacements of the second mass (108) along the second axis (Y), includes a charge amplifier (133), for converting charge packets (Q RS ) supplied by the inertial sensor (6) into a charge-integration signal (S QI ), and a low-pass filter (136). A calibration stage (138, 140) enables modification of a voltage (V B ) between the second mass (108) and the fixed body (109) so as to minimize a component (2ω R ) at a frequency that is twice the resonance frequency in the charge-integration signal (S QI ).
Abstract:
A micro-electro-mechanical sensor includes a microstructure (102), having a mass (108), which is movable with respect to a rest position (Y 0 ), according to a predetermined degree of freedom (Y); and a displacement-detecting device (104, 106) for detecting a displacement of the mass (108) according to the predetermined degree of freedom (Y). The displacement-detecting device (104, 106) includes a force feedback loop (106) of a purely analog type, which supplies electrostatic forces tending to bring back the mass into the rest position (Y 0 ), in response to a displacement of the mass (108) itself according to the predetermined degree of freedom (Y).