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正弦信号发生器
摘 要
本系统采用 AT89S51 单片机为核心，辅以必要的模拟，数字电
路，构成了一个基于 DDS 技术的正弦波信号发生器。该软件系统采
用 4*4 键盘操作，以菜单形式进行显示，操作方便简单，软件增加了
许多功能。它通过启动 DDS，把内存缓存区的数据读出送到 DDS 后
输出相应的频率，并把数据转换为 BCD 码，通过液晶显示器进行显
示。该系统体积小、稳定度、精度极高，方便携带，适用于当代的尖
端的通信系统和精密的高精度仪器以及高频无线传输系统等。
关键词：直接数字频率合成（DDS）、AD9851、VCO
Sinusoidal Wave Signal Generator
[Abstract ] By using the AT89S51 as its core and combining the
necessary analog and digital circuits, a sinusoidal wave signal
generator is built based on the DDS technology. The software
utilized in the system can be operated with a 4X4 keyboard,
displayed in a menu and hence makes the system easy to use.
Through booting up the DDS, reading the data from the buffer
of the memory and transmitting them to DDS modules, a relevant
frequency output combining the BCD code generated at the same
time can be obtained and displayed on a LCD screen. The system
is suitable for using in modern communications systems and high
accuracy instruments with the aid of its small size,
portability, stability and high accuracy.
一． 方案比较与论证
