基于FPGA三角波周期随机变化数字信号发生器的设计  

Design of Digital Generator of Triangle Wave with Random Cycle Based on FPGA

作　　者：冉自博[1,2] 马游春[1,2,3] 刘红雨[1,2] 李泽明[1,2] 

机构地区：[1]中北大学 电子测试技术国家重点实验室,太原030051 [2]中北大学 仪器科学与动态测试教育部重点实验室,太原030051 [3]北京航空航天大学 光电技术研究所,北京100083

出　　处：《计算机测量与控制》2013年第9期2604-2606,共3页Computer Measurement &Control

摘　　要：在现代通信系统的科研实验中，常常需要用到周期随机变化的特殊三角波信号；为了产生这种特殊的信号，采用FPGA产生特殊三角波所需的数字数据，通过D／A转换芯片将该数据转换为模拟信号；在使用VHDL语言编程时，调用Xilinx公司的IP核产生随机数据作为三角波数据的上限，使得每个周期的数据变化范围随机改变，从而改变三角波的周期；实验设置三角波输出信号平均频率为500Hz，最大最小变化范围小于20％，用示波器观察输出波形。通过实验，三角波的周期在1．667～2．500ms范围之间随机变化，平均周期约为2ms。The special triangle wave with random cycle is used in scientific experiments of modern communication system. In order to make the special signal, FPGA often is used to generate digital data that is needed in making the special triangle wave, and then the digital data wilt be converted to analog signal by a D/A chip. IP core from Xilinx corporation is used to generate random data that will be the top limitation of triangle wave when we program by VHDL, which changes the scope of data randomly in every cycle, as the result of, to change the cycle of triangle wave. The mean frequency of output signal is set at 500 Hz, and the scope of changing from maximum value to minimum value is less than 20~ in doing experiment, the output waveform will be seen by a oscilloscope. The result of this case was proved by doing experiment, andwe can see that the period of the special triangle wave is vary randomly from 1. 667ms to 2. 500ms , and the mean value is 2ms.

关 键 词：三角波 FPGA 信号发生器 

分 类 号：TN702[电子电信—电路与系统]