Coupling signal suppression circuit in quartz tuning fork gyroscope

Abstract

The invention relates to a coupling signal suppression circuit in a quartz tuning fork gyroscope. After signals output by a quartz tuning fork sensitive electrode pass through a static coupling suppression circuit, static coupling signals in a common mode state are effectively suppressed, and useful signals and differential mode interference signals are amplified; signals output by the static coupling suppression circuit are subjected to phase adjustment to ensure that the phase of mechanical coupling signals and the phase of related detection signals are orthogonal; and phase adjustment quantity realized by a phase adjustment circuit is marked as sigma, and the phase adjustment generates cos sigma gain for finally output useful signals and generates sin sigma gain for the mechanical coupling signals. The invention overcomes the defects that the traditional single-electrode detection circuit cannot suppress static coupling signals and cannot effectively suppress vibration coupling by adopting the technical scheme of double-electrode charge differential amplification and vibration coupling phase adjustment, not only completely suppresses the static coupling signals, but also provides conditions for effectively suppressing vibration coupling, and therefore, the performance of the microquartz tuning fork gyroscope is improved.

Description

technical field [0001] The invention belongs to the field of circuits for suppressing interference signals, in particular to a coupling signal suppressing circuit in a quartz tuning fork gyroscope. Background technique [0002] At present, the interference signal suppression method of quartz tuning fork gyro is based on the single-electrode signal correlation detection with lock-in amplifier as the core, that is, using the charge device to amplify the output charge of the positive pole of the quartz tuning fork gyro, and then compare the amplified signal with its inverse signal. The switch is gated, and then the high-frequency interference is filtered out through a low-pass filter to obtain a DC voltage signal proportional to the input angular velocity. [0003] The correlation detection principle with correlation detection as the core is: when the quartz tuning fork works in the driving resonance mode, if the angular velocity Ω is output in a specific direction, the output ...

AI Technical Summary

Problems solved by technology

First of all, there are static coupling components and vibration coupling components in the DC voltage output by single-pole detection. If the static coupling and vibration coupling are large, the zero position will be too large, affecting the dynamic range and even directly saturating the output; secondly, the output signal of the single-pole detection circuit Directly affected by static and vibration coupling, which are sensitive to temperature and cause too much zero drift

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