基于AD9859的扫频信号发生器的设计

Design of Swept Signal Generator Based on AD9859

本文介绍了直接数字合成(DDS)技术以及C8051F020微控制器,阐明了采用AD9859实现扫频信号发生器的原理,具体描述了C8051F020微控制器与AD9859之间的硬件接口电路以及相应的软件设计方法,设计了一个5阶低通椭圆滤波器,使输出的正弦波更加稳定、平滑。本设计能够产生良好的扫频信号,并且C8051F020和AD9859的优越性能大大提高了扫频速度,是一种良好的数字化设计。

This text discusses the technology of Direct Digital Frequency Synthesis（DDS） and the C8051F020 microcontroller .The method to design the frequency sweeping generator used AD9859 was illustrated.The hardware interface circuit between the C8051F020 microcontroller and AD9859 and corresponding software design method were described in detail.A 5th order low pass elliptic filter was designed which makes the output that are sine waves more stable and more smooth.This design can generate good swept signal,and the perfect performance of C8051F020 and AD9859 increase the swept speede greatly.It is a good digital design.