DDS技术和FPGA在多功能信号源中的应用

针对信号源频率分辨率低、变频速度慢、频率准确度低、开发更新周期长等问题,采用四级流水线技术和EDA工具,设计并实现了一种以FPGA、高速D/A和低通滤波为核心,基于DDS技术的多功能信号源,并对DDS误差进行了分析.实验测试结果表明该系统硬件电路简单可靠,能够产生幅度和频率可调的正弦波、方波、三角波和锯齿波,频率范围在1×10-8～40MHz,频率分辨率可达0.01Hz,频率准确度在±0.1%内.具有频率分辨率高、处理速度快、输出灵活等特点.

A Multifunction Signal Generator Based on DDS and Its Implementation on FPGA

Due to the questions of the low frequency resolution,the slow frequency conversion speed,the long cycle of development and update of the signal generator,a multi-function signal generator,which is based on DDS technology,is designed and implemented with four pipeline technique and EDA tool.The error analysis of DDS is given in the paper.The experiment results show： The system is simple and reliable and can generate sine wave,square wave,triangular wave and saw tooth wave;The frequency range of waves is between 0.01 Hz and 40 MHz,frequency resolution comes up to 0.01 Hz and frequency accuracy is less than ±0.1%,It has the characteristics of high frequency resolution,fast processing speed and flexible output.