Patent ID: 9528831
Filing Date: 2016-12-27
CPC Classification: G01C

Claim Text:
1. An electronic circuit for measuring rotational speed in a gyroscope with a MEMS resonator, the electronic circuit being connected to at least one resonator of the gyroscope, the resonator including a mass connected to a structure of the gyroscope by a spring and a damping element, an actuation element for setting in motion the mass in one direction based on an actuation signal, supplied by a drive circuit, and a detection element for detecting motion of the mass to adapt at least one level of oscillation amplitude of the mass in motion in a control loop of the drive circuit, wherein the electronic circuit includes a measurement element in the form of at least one resistor, which is connected to the mass in motion and whose resistive value varies at a frequency identical to an oscillation frequency of the mass in motion, the resistor being polarized to supply at least one measurement signal at one end of the resistor, the measurement signal being formed of a combination of a carrier signal in phase with the oscillation of the mass in motion and of an angular speed signal being phase shifted by π/2, and wherein the electronic circuit includes an integration unit clocked by a clocking signal originating from the control loop of the drive circuit, the clocking signal being phase shifted by π/2 relative to a detection signal of the detection element in phase with the carrier signal to allow the integration unit to demodulate the angular speed signal from the measurement signal.