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.