摘要
介绍了一种基于DDS(直接数字频率合成器)和单片机的高精度频率信号源的硬件实现方案。利用51单片机STC12LEC5A32S2控制DDS芯片AD9852,可以产生一个分辨率高,转换速度快,波形良好,输出频谱纯的信号。具有调幅、调频、数字调幅、数字调相、数字调频、跳频等功能。通过LabWindows上位机软件可以控制DDS的工作模式,以及工作频率。上位机和信号源通过485总线连接,可以实现远程控制。从实验数据可以得到较好的信号指标,如频率准确度,杂散和谐波。文中主要介绍了单片机与AD9852的硬件接口设计和系统设计,及注意事项。
The design method of a high-accuracy signal synthesizer based on MCU and DDS is presented. By using MCU chip STC12LEC5A32S2 to control DDS chip AD 99852,a signal with high resolution, high transferring speed and pure spectrum is obtained ,which can be used in AM,PM,FM,ASK,FSK,FH. Use the labwindows soft to control the mode of the DDS and the value of frequency. PC connect the signal synthesizer with 485 bus.It can realize remote control. From the experiment data we can find good signal indicators as frequency accuracy, spurious and harmonic wave.The hardware interface, the system and some key points in the design are mainly introduced.
出处
《电子测试》
2011年第12期82-85,共4页
Electronic Test
关键词
直接数字频率合成器
频率信号源
分辨率
DDS
frequency signal source
high resolution
transferring speed
