基于AD9858的宽带线性调频源设计

Design of broadband linear chirping source based on AD9858

作为高性能DDS单片集成电路,AD9858可方便快速地产生线性调频、单频脉冲信号。现代雷达技术的发展对信号源的性能提出了更高的要求,越来越多的雷达采取宽频带的线性调频信号体制。高性能的AD9858为简化频率源电路设计、提高电路性能提供了一条新的途径。从某频率源的要求出发,介绍了一种宽带线性扫频信号的实现方案,阐述了DDS时钟产生电路、耦合滤波电路、上位机软件功能等方面的设计,进行了必要的仿真,并给出了最终设计的信号源的测试结果。表明AD9858在通信设备、军事以及航空雷达的设计当中是很有应用前景的。

As the high performance DDS chip,AD9858 can easily generate linear chirping signal and single-tone signal.With the development of the modern radar technology,the higher requirement is needed in the signal source.The broad-band linear chirping radar system is widely applied.The high performance AD9858 provides a new way for simplification of the signal source design and improvement of the system reliability.To meet the need of one signal source,this paper describes the design and implementation of broad-band linear chirping signal source.The design of DDS clock circuit,coupling filtering circuit and the function of upper computer software are elaborated.The simulation was implemented with simulation software.The testing result of signal source is given.It has a good application prospect in the fields of communication,military applications and radar applications.