关键词: DDS, 相位累加器, AD9852

Abstract:

Based on the principle of direct digital frequency synthesis technology DDS,this article analyses the influence of the core factors of DDS output frequency.On this basis,the computer simulation proves the digits of the phase accumulator of DDS output frequency.This article introduces a DDS chip AD9852,and based on this chip,this article proposes a design of radar echo simulator,then analyzes the advantages and disadvantages of DDS chip.The design can be stable to produce 70 MHz carrier frequency of radar echo,needed to properly simulate the echo.

Key words: DDS;the phase accumulator;AD9852