Temperature compensation mechanism for a micromechanical ring resonator

Time reference oscillator comprising a resonator (4) and an integrated electronic circuit (3) to drive the resonator in oscillation and in response to the oscillation produce a signal at a given frequency. The resonator is an integrated micromechanical ring resonator (4) held in place on the upper side of a substrate (2) and adapted to oscillate in a first oscillation mode about a axis of rotation (O) which is substantially normal to the substrate's main plane, this ring resonator (4) comprises a central post (5) extending from the substrate (2) along the axis of rotation (0), and a free-standing oscillator structure (6) coupled to the central post.