基于FPGA的DDS函数信号设计  

Direct Digital Synthesis Function Signal Design Based on Field-programmable Gate Array

作　　者：李帅[1] 蒲金龙[1] 

机构地区：[1]中国电子科技集团公司光电研究院,天津300308

出　　处：《光电技术应用》2017年第3期49-53,共5页Electro-Optic Technology Application

摘　　要：直接数字合成(DDS,direct digital synthesizer)是一种把一系列数字信号通过D/A转换器转换成模拟信号的数字合成技术。DDS函数信号设计由相位累加器、波形存储器、D/A转换器和低通滤波器构成。FPGA完成相位累加和波形存储器设计,输出数字序列,经过D/A转换器和低通滤波后,产生模拟信号。使用示波器显示验证,将波形频率上限为5 KHz的单片机电路提升为20 KHz,并提高信号精度。本方案进行了大量实验验证,可以广泛应用于可编程片上系统。Direct digital synthesis （DDS） is a digital synthesis technology that converts a series of digital sig- nals to analog signals via digital to analog （D/A） converters. DDS function signal designing system consists of a phase accumulator, a waveform memory, a D/A converter and a low-pass filter. The design of phase accumulation and waveform memory is implemented by field-programmable gate array （FPGA）, digital sequence is output, and the analog signals are generated via D/A converters and low-pass filtering. Using the oscilloscope to verify the wave-form, the 5 KHz maximum waveform frequency of the single-chip circuit is enhanced to 20 KHz and the signal accuracy is improved. The scheme is verified by experiments and can be widelv used in programmable systems.

关 键 词：FPGA DDS 信号产生 提高精度 

分 类 号：TN911.72[电子电信—通信与信息系统]