基于FPGA的高性能信号源模块设计

Design of high-performance signal generator module based on FPGA

在深入分析直接数字合成(DDS)原理的基础上,提出了在FPGA上嵌入DDS技术实现高性能信号源模块的设计方案。该方案采用了一种基于FPGA的高速48位DDS相位累加器优化方法,利用高速SRAM和ROM相结合的方式大幅度提高信号源的波形存储深度。选用超高速低失真16位D/A转换芯片AD9726,设计了基于椭圆函数的低通滤波器并给出其仿真结果。测试表明,该信号源模块具有高速度、高分辨率和低失真等特性。

This paper presents a design of high-performance signal generator module which embedded DDS technology in FPGA base on deep analysis of DDS principle.The proposed scheme adopts an optimization method for high speed 48-bit DDS phase accumulator in FPGA,and combines high-speed SRAM with ROM to significantly improve the waveform storage depth of the generator.The ultra low distortion and high speed 16-bit D/A convertor AD9726 is used.The design and simulation result of an elliptic function low-pass filter is also presented.Test results show that the proposed signal generator module features high speed,high resolution and low distortion.