MICROELECTROMECHANICAL GYROSCOPE HAVING A RESONANT DRIVING LOOP WITH CONTROLLED OSCILLATION AMPLITUDE AND METHOD OF CONTROLLING A MICROELECTROMECHANICAL GYROSCOPE

A microelectromechanical gyroscope includes: a support structure (6); a driving mass (7) movable according to a driving axis (X); and an oscillating microelectromechanical loop (10), having a resonance frequency (f) and a loop gain (GLOOP) and including the driving mass (7), a sensing interface (12), which senses a position of the driving mass (7), and a gain control stage (18), which maintains a modulus of the loop gain (G) at a unitary value at the resonance frequency (f). The gain control stage (18) includes a sampler (20) and an transconductance operational amplifier (21) in an open-loop configuration. The sampler (20) acquires samples (V*) of a loop signal (V) from the sensing interface (12) in a first operative condition and transfers them to the transconductance operational amplifier (21) in a second operative condition. The sampler (20) decouples the transconductance operational amplifier (21) from the sensing interface (12) in the first operative condition and in the second operative condition.