The invention provides an MEMS gyro automatic
modal matching control device based on a
negative stiffness effect, and adopts external calibrating
signal input, so as to obtain a required
modal matching control quantity. The external calibration
signal is formed by superposition of two groups of sinusoidal signals a and b with different frequencies, the frequency of one group is higher than the
center frequency of a
driving mode, the frequency of the other group is lower than the
center frequency of the
driving mode,
frequency difference between the frequencies of the two groups and the
center frequency of the
driving mode is equal, thus automatic
modal matching is realized, and no extra reference quantity is needed. The device suppresses
signal coupling and interference in a modal matching process. Two paths of calibrating signals having the same
frequency difference with a driving signal are used, a reference signal of a PI controller is set to be 0, and open-loop search for a reference point is not needed. In the device, the calibrating signals are loaded on a detection mechanism in the form of force feedback, the detection mechanism is put in a
feedback loop, detection of the amplitude-
frequency characteristic of a mode is brought into full play, and output amplitude of the calibrating signal passing the detection mechanism is relatively large.