基于分立元件的DDS重构滤波器的性能分析

The Performance Analysis of DDS Restructuring Filter Based on the Discrete Component

DDS的DAC所输出的频谱中包含有很多镜像频率,该镜像频率是造成DDS输出频率周期性抖动的主要因素,若要消除这种抖动获得纯净的输出频率,就必须充分了解重构滤波器的滤波特性和最优的构建方法。本文主要介绍了如何基于分立元件搭建性能最优的LC低通滤波器,并对不同的滤波器构建方式进行了特性分析和对比。

There are many image frequency in the output frequency spectrum of DDS's DAC, these image frequencyis primary factor which cause output frequency Jitter,if we want to eliminate this,we must fully understand the charac-teristic and the best structure of the filter.This article introduce how to establish the best LC low pass filter,and givingthe performanceanalysis and contrast for the different filter structure.