雷达科学与技术2016，Vol.14Issue(2)：215-219,224,6.DOI:10.3969/j.issn.1672-2337.2016.02.020
基于FPGA的并行DDS结构设计∗
Structural Design of a Parallel DDS Based on FPGA
苟力 1吕幼新 1蒋思源1
作者信息
- 1. 电子科技大学电子工程学院，四川成都 611731
- 折叠
摘要
Abstract
Frequency synthesizer is called the heart of electronic systems.Compared with traditional fre-quency synthesis technology,the direct digital synthesizer(DDS)has obvious advantages.However,it has a limited output frequency and serious output stray.Using FPGA to realize DDS is limited by the speed and power consumption of the chip itself,as a result,the FPGA based DDS of high speed and low power con-sumption has the vital significance.A parallel DDS structure is given.The phase accumulator adopts four-way parallel implementation,and in every way,two-stage pipelining structure is used to improve the ad-dressing speed.The lookup table and the angle rotation method similar to the coordinate rotation digital cal-culation(CORDIC)algorithm are combined to realize phase transformation.Finally,the multiphase structure is adopted to realize four-way parallel output,and the -120 dB spurious free dynamic range(SFDR)orthogo-nal waveform is obtained.Compared with the single-way DDS,the output signal spectrum bandwidth of the four-way parallel structure is increased four times.关键词
并行结构/直接数字频率合成/坐标旋转数字计算方法/高速Key words
parallel structure/direct digital synthesizer(DDS)/CORDIC algorithm/high-speed分类
信息技术与安全科学引用本文复制引用
苟力,吕幼新,蒋思源..基于FPGA的并行DDS结构设计∗[J].雷达科学与技术,2016,14(2):215-219,224,6.
