摘要
介绍DDS的基本原理和结构,DDS芯片AD7008的功能,16位单片机MSP430F435的基本使用,以及由该单片机和AD7008芯片组成的数字信号发生器的原理和结构。利用全数字频率合成技术,制作高质量低成本的信号发生器,使用单片机通过数字调节控制AD7008芯片,对信号进行放大滤波处理,提供稳定度高和失真度小,频率、相位、幅度可调的正弦波或余弦波信号。系统频率输出稳定度高、精度高,提供高质量的信号源,为高精度的计量和测试提供方便,易于控制,在实际应用中取得了明显的应用成效。
The basic theory of DDS, the function of chip AD7008 and the way of using of MSP430F435 are introduced. The theory and structure of digital signal generator making up of MSP430F435 and AD7008 are given. The higher quality and lower cost of digital signal generator is produced using phase accumulator direct digital synthesizer technology. It is provided stability and low distortion, frequency modulation, phase modulation and amplitude modulation sine and cosine signal through digital modulation and signal processed by amplifier and filter. The source has high precision and stably frequency, and it provides high quality digital signal of source and convenience for high precision measurement and easily controlled. It has been proven to provide benefits to our practice application.
出处
《控制工程》
CSCD
2007年第B05期133-135,138,共4页
Control Engineering of China
