资 源 简 介
介绍了ADI公司新推出的双通道带10位D/A转换器主频达500 MHz的DDS芯片AD9958的主要性能，并根据不同波形种类的雷达信号表达式，简述了AD9958用作直接频率合成器时，各种情况控制字的计算方法，给出了利用DSP +FPGA+AD9958实现雷达中频信号源的设计框图，对其中主要的FPGA时序控制进行QuartusII仿真。该设计可以灵活产生包括常规脉冲、线性调频、相位编码以及混合编码在内的多波形雷达中频信号。
Abstract:
Main feature of AD9958-namely the high performance DDS chip of 2-Channel 500 MHz with 10-bit D/A conveter is introduced.this chapter briefly describes the method of calculaTIng control word for using AD9958 as direct frequency composiTIon,And a method of realizaTIon of radar intermediate frequency signal by means of DSP,FPGA and AD9958 is proposed in this paper.Finally,a control module with FPGA design is simulated with QuartusII.This design can generate MulTI-waveforms radar intermediate frequency signal including signal-tone,lpm modulation,psk modulation and mixed encoding.
