基于DDS技术的正弦信号发生器的设计

The Design of Sinusoidal Signal Generator Based on DDS Technology

基于直接数字频率合成(DDS)技术,设计正弦信号发生器。采用单片机AT89S51控制DDS芯片AD9851,由AD9851产生频率可调的正弦信号,并通过5阶低通滤波器得到纯正的正弦信号,经功率放大驱动电路输出目标信号。具有频率分辨率高、范围宽、信号建立时间短\操作方便等优点。在现代电子仪器、通信技术、医学成像、雷达、卫星通信上得到广泛应用。

This article puts forward the design of sinusoidal signal generator based on direct digital frequency synthesis （DDS） technology, controlled by AT89C51, creates sinusoidal signal with adjustable frequency from the DDS chip AD9851, and gets the pure sinusoidal signal with the 5th low pass filter. The target signal is output through electric power enlarging driving circuit in the end. The advantage is high frequency accuracy, short-time signal establishment, broad scope, convenient operation and wide application in the modem electronic instruments, communication technology, medical science, radar, and satellite communication.