基于FPGA与AD9786的调制解调电路的设计  

Design of Modulation and Demodulation Circuit Based on FPGA and AD9786

作　　者：丁少轩 刘文耀[1] 石云波[1] 刘昊东 DING Shaoxuan;LIU Wenyao;SHI Yunbo;LIU Haodong(Shanxi Provincial Key Laboratory of Quantum Sensing and Precision Measurement,North University of China,Taiyuan 030051)

机构地区：[1]中北大学量子传感与精密测量山西省重点实验室,太原030051

出　　处：《舰船电子工程》2024年第2期170-174,共5页Ship Electronic Engineering

摘　　要：谐振式光学陀螺因其高理论精度、小型化以及高稳定性受到了国内外的强烈关注。针对于谐振式光学陀螺检测信号微弱的特点,需要对该信号进行调制解调,以实现陀螺的稳定输出,设计了一种基于FPGA和AD9786的高精度模拟信号源,该信号以FPGA作为核心控制单元,AD9786作为数模转换器,实现16位的高精度DA转换,通过上位机实现指令的通信过程,可实现不同频率的交流信号。该实验结果表明,该系统符合陀螺测试系统调制解调要求,通过上位机对不同输出信号进行测试,且测试结果无纹波时输出噪声Vrms269μV,交流信号精度达到0.01%,最高频率可达到2M,稳定性高。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.

关 键 词：陀螺 FPGA AD9786 模拟信号 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]