MEMS resonant gyroscope interface circuit and measurement and control system

Abstract

The invention provides an MEMS resonant gyroscope interface circuit and a measurement and control system. The device uses a ring oscillator to collect a small capacitance signal of a gyroscope instrument head to obtain a square wave signal, the square wave signal is inputted to a main control chip to detect the square wave frequency, and the displacement amount of the instrument head is measured.Compared with an analog-to-digital converter and the peripheral circuit thereof, the signal acquisition scheme circuit greatly reduces the number of electronic components and compresses the hardware volume of the gyroscope measurement and control system. The system uses the main control chip to directly generate an analog signal, the analog signal enters a buffer module circuit to be outputted tothe gyroscope instrument head, most of the work in the signal output scheme is completed in the main control chip, the peripheral circuit only has the buffer module circuit, and in comparison with theanalog-to-digital converter and the peripheral circuit thereof, the number of electronic components is greatly reduced, and the hardware volume of the gyroscope measurement and control system is compressed. The MEMS resonant gyroscope interface circuit and the measurement and control system have the advantages that the cost is compressed, the signal-to-noise ratio is improved, temperature drift is controlled, the energy consumption can be controlled, the startup time is short and the like.

Description

technical field [0001] The invention relates to a MEMS resonant gyroscope interface circuit and a measurement and control system. Background technique [0002] Due to the attenuation effect of electromagnetic waves in the underwater environment, satellite communication systems such as GPS and Beidou cannot be used. Therefore, inertial navigation technology plays a vital role in the underwater environment. [0003] Micro-Electro-Mechanical System (MEMS) resonant gyroscope has many advantages such as low power consumption, low cost, and short start-up time, so it has great potential in marine inertial navigation applications. [0004] Traditional MEMS resonant gyroscopes mostly use mature data converter chips (including ADC chips and DAC chips) to solve the problems related to driving the vibration of the gyro instrument head (that is, the output signal drives the vibration of the meter head) and analog signal acquisition. [0005] However, the above implementation scheme req...

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Problems solved by technology

[0005] However, the above implementation scheme requires the support of the data converter chip and its huge peripheral circuits, which increases the hardware volume of the entire MEMS resonant gyroscope interface circuit and the measurement and control system, and has the characteristics of serious temperature drift, large energy loss, and high cost. , which severely limits the scope of application of the system

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