Design of Modulation and Demodulation Circuit Based on FPGA and AD9786
Resonator optical gyro has attracted much attention at home and abroad because of its high theoretical accuracy,miniaturization and high stability.In view of the weak detection signal of resonant optical gyro,the signal needs to be modulated and demodulated to achieve stable output of gyro.A high-precision analog signal source based on FPGA and AD9786 is designed.The signal takes FPGA as the core control unit and AD9786 as the digital-to-analog converter to achieve 16-bit high-precision DA conversion.Through the upper computer to realize the instruction communication process,the AC signal of different frequencies can be realized.The experimental results show that the system meets the modulation and demodulation requirements of gyro test system,and the test results without ripple output noise Vrms269μV,AC signal accuracy reaches 0.01%,the highest frequency reaches 2M,and has high stability.
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维普
