Vibrating micro-system with automatic gain control loop, with integrated control of the quality factor

Integrated device comprising:

• a resonator (10) with vibrating element(s) (11) placed in an oscillating circuit controlled by a servo-loop, the oscillating circuit providing an oscillation signal at a constant frequency or at a variable frequency representing the measurement of a physical quantity, this oscillation signal serving to formulate an output signal of the integrated device and the output signal representing a time base or a measurement of a physical quantity, with a desired nominal precision;
• and a circuit (31) for measuring a quality factor of the resonator configured to perform a measurement of the quality factor during a phase of cutoff of the servo-loop;
• and
• wherein the output signal of the integrated device is provided even during the cutoff phase, and the circuit for measuring the quality factor comprises a sequencing circuit (40) configured to limit a duration of the cutoff phase (PB) of the servo-loop to a value Td, the said value Td being such that at the end of the cutoff phase, the peak amplitude of the oscillation signal is attenuated by a factor k that is less than a limit value k0 for which the time base or the measurement of a physical quantity would no longer be obtained with the desired precision.