Method and device for synchronous demodulation of multiple modulated signals

Method in which a capacitor is used to detect the effect of the Coriolis effect acting on the spring-mass system. A time varying signal generated from the capacitor is demodulated over multiple frequencies. The electrical signal includes a time varying electrical signal (fHF) and the resonance frequency (fZ) of the spring-mass system. The electrical signal is generated such that it has a fixed phase relationship relative to the eigen-resonance frequency of the rotation sensor. The invention also relates to a corresponding device for synchronous demodulation. A high frequency signal is used to evaluate capacitance changes and a fixed phase relationship, with the phase of the high frequency signal being a multiple of the resonance frequency signal, between it and the eigen- resonance frequency of the sensor is obtained using a PLL circuit. The logical linking of the two signals is used to control the synchronous demodulator.