一种低开销的频率可编程正弦波发生器设计  

Design of a Frequency Programmable Sine Wave Generator with Low Overhead

作　　者：屈盼让 孙少华 肖鹏[1] 蔡晓乐 QU Pan-rang;SUN Shao-hua;XIAO Peng;CAI Xiao-le(Xi′an Aeronautics Computing Technique Research Institute,AVIC,Xi′an 710068,China)

机构地区：[1]航空工业西安航空计算技术研究所,陕西西安710068

出　　处：《航空计算技术》2021年第2期123-125,共3页Aeronautical Computing Technique

基　　金：航空科学基金项目资助(2016ZC31004)。

摘　　要：正弦波波形发生器作为主要激励设备被广泛应用于航空机载设备中。基于FPGA设计了一种频率可编程的正弦波发生器。根据频率配置字和系统时钟频率合成相位,再以相位为索引进行查找表幅值抽取,并控制高速数模转换器将幅值信息转换为电压信号,从而实现可变频率的正弦波输出;通过应用正弦波的对称特性,设计了轻量级查找表,依据相位判断的结果,建立相位索引和查找表索引之间的映射关系,并生成符号位,将存储资源开销降低了75%。通过仿真验证了设计的有效性。The sine wave generator is widely used in aviation equipment as the main excitation source.This paper designs a sine wave generator with programmable frequency based on FPGA.Synthesize the phase according to the frequency configuration word and the system clock frequency,and then use the phase as the index to extract the amplitude of the look-up table,and control the high-speed digital-to-analog converter to convert the amplitude information into a voltage signal,so as to achieve variable frequency sine wave output.Using the symmetry characteristics of the sine wave,a lightweight look-up table is designed.Based on the result of the phase judgment,the mapping relationship between the phase index and the lightweight look-up table index is established,and the sign bit is generated which reduces the development of the storage resources by 75%.The simulation results show the effectiveness of the design.

关 键 词：正弦波发生器 FPGA 相位合成 查找表 

分 类 号：V243[航空宇航科学与技术—飞行器设计]