Automatic gain control (AGG) self-excited oscillation driving circuit of micro-solid modal gyroscope

Abstract

The invention discloses an automatic gain control (AGG) self-excited oscillation driving circuit of a micro-solid modal gyroscope, which comprises an oscillation circuit formed by five parts including a charge amplifier, a phase shifter, an amplifier, a band-pass filter and an automatic gain controller, wherein a gyroscope vibration signal is firstly received and enhanced by the charge amplifier, and then phase adjustment is carried out on a signal output by the charge amplifier by the phase shifter, so that the self-excited oscillation condition of a closed loop drive circuit can be met; the signal is amplified by the amplifier, and then frequency-selecting is carried out on the amplified signal by the band-pass filter; after passing through the band-pass filter, the signal enters the automatic gain controller; the automatic gain controller is used for controlling gain according to the difference value between the obtained signal amplitude value and reference signal amplitude value; and finally, a sine driving signal with constant amplitude and stable frequency can be obtained, and a whole closed loop drive system is ensured to be stable. The AGG self-excited oscillation driving circuit can be used for providing the driving signal with constant amplitude and stable frequency to the micro-solid modal gyroscope, so that the problems of the existing closed loop drive circuit can be solved.

Description

technical field [0001] The present invention relates to a micro solid mode gyroscope, specifically a self-excited oscillation circuit, especially an AGC (Automatic Gain Control, automatic gain control technology) self-excited oscillation drive circuit of a micro solid mode gyroscope, which can be a micro solid mode gyroscope Provide constant amplitude, stable frequency drive signal. Background technique [0002] The micro solid mode gyroscope uses piezoelectric materials as the driving and detection components, and is a new type of all-solid-state MEMS micro gyroscope. Different from the general MEMS vibrating gyroscope, the inertial mass and elastic support structure of the micro solid mode gyroscope are integrated, so it has the advantages of overload resistance, strong impact resistance, high working resonance frequency, no need for vacuum packaging, and short start-up time. It has broad application prospects in the fields of consumer electronics, smart shells, aircraft ...

AI Technical Summary

Problems solved by technology

The open-loop drive cannot automatically detect the resonant frequency of the gyroscope's working vibration mode, resulting in a large measurement error

In the existing circuit, when the micro-solid modal gyro resonator is disturbed by external shocks or power supply voltage fluctuations, the driving vibration amplitude will have corresponding shocks or fluctuations, and these factors will cause the instability of the gyro measurement accuracy.

Images