Constant-frequency drive method and constant-frequency drive device of tunable micromechanical gyroscope

The invention discloses a constant-frequency drive method and a constant-frequency drive device of a tunable micromechanical gyroscope. The method comprises the steps of generation of a drive signal, generation of a tuning signal, signal detection, amplitude extraction and phase extraction, and the device comprises the tunable micromechanical gyroscope, a drive signal generation circuit, a capacitance/voltage conversion circuit, a tuning signal amplification circuit, a first digital/analog converter, an analog/digital converter, a second digital/analog converter and an in-situ programmable gate array chip. Through the automatic adjustment of the alternative-current drive signal amplitude and the resonant frequency of the tunable micromechanical gyroscope, the frequency and the amplitude of the drive output signal can be maintained constant, and the phase difference of the drive output signal and the alternative-current drive signal can also be maintained constant. The constant-frequency drive method and the constant-frequency drive device are simple to realize, the resonant frequency of a drive modal is unnecessary to track, the influence on the system from the module which is correlated to the frequency in the system under the time-variant frequency can be avoided, the signal processing process of the system can be simplified, and the system stability can be improved.