Design of Digital Acquisition Circuit for Inertial Sensor Based on FPGA

Abstract

In order to realize high-speed analog sampling and noise analysis, the paper put forward a design scheme of the high-speed data acquisition and analysis system based on FPGA, the system uses Cyclone series FPGA with high-speed A/D converter, and using fast Fourier analysis core of the Altera Company. The ADC model is AD9643 chip. The test results show that the prototype can simultaneously collect three output signals, and real-time processing to the host computer display. The measured gyro resonance frequency is stable at 324.88 kHz, fluctuation range is 9Hz, and the mean square deviation of the peak value is 0.008 V on the output voltage of reference point. The detection system is stable and has high precision. The digital detection circuit can be applied to the signal processing of MEMS gyroscope, which can improve the stability and anti-jamming of MEMS gyroscope.