摘要
以设计低通椭圆滤波器为目的,依据DDS的基本原理,采用了EDA仿真手段,研究了低通椭圆滤波器的设计方法,确定了滤波器的阶数和拓扑结构,并设计了相关参数.得出了截止频率为120MHz的9阶低通椭圆滤波器幅频特性好,通带波纹小于0.25dB,具有快速的衰减速率,在144MHz处衰减为70dB.
Low-pass elliptic filter is designed according to the primary principle of direct digital synthesize technique using EDA simulation. The paper researched the method of designing low-pass elliptic filter, confirmed the order and framework of filter, and designed correlative parameters. A 9th -order low-pass elliptic filter is attained that its cut - off frequency is 120 MHz; its phase frequency characteristic is good; its passband ripple is less than 0.25 dB; and has speedy attenuation, which is 70 dB in 144 MHz.
出处
《哈尔滨理工大学学报》
CAS
2004年第5期22-24,共3页
Journal of Harbin University of Science and Technology
