【摘要】 针对科里奥利质量流量计在线测试系统的需要,设计了一种基于现场可编程门阵列(FPGA,fieldprogrammable gate array),以直接数字频率合成技术(DDS,direct digital synthesis)为基础的高精度信号发生器。通过对其进行改进,在保证原有分辨率的情况下使研制方案节省了硬件资源。详细描述了DDS的基本原理和构成、优化方案的算法以及具体实现,并经过Quartus II和ModelSim仿真试验验证方案的可行性。更多还原

【Abstract】 According to the requirement of online test system of Coriolis mass flowmeter(CMF),a high precise sine signal generator based on field programmable gate array(FPGA) and direct digital synthesis(DDS) is developed.With ensuring the frequency resolution and accuracy of the vibrating system,some useful optimizations are proposed and the hardware resource can be economized abundantly.The basic principles and constitution of direct digital synthesis,arithmetic of the optimizations and the realization schemes of implement are described in detail.The simulation uses Quartus II and ModelSim and experiment demonstrates that the schemes are feasible.更多还原