Microelectromechanical gyroscope having a resonant driving loop with controlled oscillation amplitude and method of controlling a microelectromechanical gyroscope

An electronic system, comprising:

• a microelectromechanical gyroscope including:
• a support structure;
• a driving mass capacitively coupled to the support structure and movable relative to the support structure according to a driving axis;
• and
• an oscillating microelectromechanical loop, having a resonance frequency and a loop gain and including the driving mass, a sensing interface, configured to sense a position of the driving mass with respect to the support structure, and a gain control stage, configured to maintain a modulus of the loop gain at a unitary value at the resonance frequency;
• and
• processing circuitry coupled to the microelectromechanical gyroscope,
• wherein the gain control stage includes a sampler and an transconductance operational amplifier in open-loop configuration,
• wherein the sampler is configured to acquire samples of a loop signal from the sensing interface in a first operative condition and to transfer the samples to the transconductance operational amplifier in a second operative condition, and
• wherein the sampler is configured to decouple the transconductance operational amplifier from the sensing interface in the first operative condition and in the second operative condition.

A method of controlling a microelectromechanical gyroscope that includes a support structure, a driving mass capacitively coupled to the support structure and movable relative to the support structure according to a driving axis and a microelectromechanical loop, having a resonance frequency and a loop gain and including the driving mass, the method comprising:

• setting the microelectromechanical loop in oscillation;
• sensing a position of the driving mass with respect to the support structure;
• and
• maintaining a modulus of the loop gain at a unitary value at the resonance frequency;
• wherein maintaining the modulus of the loop gain includes acquiring samples of loop signals indicative of a position of the driving mass with respect to the support structure and amplifying the samples in open loop, and wherein the acquiring and amplifying are temporally separate and not overlapped.