摘要
基于DDS(直接数字频率合成)专用芯片得到广泛应用,使得信号的产生与调制变得更为简单。介绍了DDS芯片AD7008的内部结构与工作原理,分析了采用AD7008实现正弦信号发生器、调幅、调频的方法,给出了基于89C51单片机与AD7008的软硬件设计方案。
At present, the ASIC based on DDS technology has been widely used. As a result, the signal generation and modulation become more simple. This article introduces the construction and principle of operation on DDS chip AD7008, illustrates the method of how to utilize AD7008 to realize sine signals generation, amplitude modulation and frequency modulation, and presents the hardware and software design based on 89C51 and AD7008.
出处
《电子工程师》
2006年第9期25-28,共4页
Electronic Engineer
关键词
DDS
频率控制字
幅度控制字
调幅
调频
DDS
frequency control word
amplitude control word
amplitude modulation
frequency modulation
