Patent ID: 7062403

Claim:
A rotational speed sensor, comprising: a vibrating gyroscope arranged and dimensioned for receiving primary and secondary excitation signals and generating primary and secondary output signals; a primary control loop arranged and dimensioned for amplifying the primary output signal, demodulating the amplified primary output signal, remodulating the demodulated primary output signal, and sending the demodulated primary output signal to said vibrating gyroscope as the primary excitation signal; a secondary control loop arranged and dimensioned for amplifying the secondary output signal, demodulating the amplified secondary output signal, remodulating the demodulated secondary output signal, and sending the demodulated secondary output signal to said vibrating gyroscope as the secondary excitation signal; a frequency synthesizer connected to the primary and secondary control and arranged and dimensioned for producing carriers for demodulation and remodulation and setting phases of the carriers in relation to one another, said carriers comprising a comparative carrier for said primary control loop; and a phase comparison circuit arranged in said primary control loop for receiving the amplified primary output signal and the comparative carrier produced by said frequency synthesizer, said phase comparison circuit and frequency synthesizer forming a phase-locked loop.