DDS信号发生器中椭圆低通滤波器的设计  

Design of Low-pass Elliptic Filter in Signal Source Based on DDS

作　　者：彭辉生[1] 陈永泰[1] 

机构地区：[1]武汉理工大学信息工程学院,武汉430070

出　　处：《电子质量》2007年第5期4-5,共2页Electronics Quality

摘　　要：本文基于DDS技术的基本原理,对DDS信号发生器中所用的低通滤波器进行了设计。采用了截止特性陡峭的7阶椭圆函数低通滤波器,该滤波器的3dB截止频率为120MHz,在145MHz处的衰减为60dB,且通带内纹波小于0.2dB。通过Multisim2001仿真研究表明:其幅频特性好,具有快速的衰减性。This article has designed an elliptic low pass filter in signal source based on the principle of the direct digital synthesis technique. A 7th-order low-pass elliptic filter with the cut-off frequency of Hz is attained. Its 3 dB cut-off frequency is 120 MHz and its attenuation is 60 dB in 145Hz.Its pass band ripple is less than 0.2Db. It has good phase frequency characteristic and speedy attenuation.

关 键 词：DDS 低通滤波器 EDA仿真 

分 类 号：TN713.4[电子电信—电路与系统]