基于IP核的锐截止中频采样滤波器优化设计  

IP Core-based Optimization Design of Sharp Cutting-off Filter for IF Sampling

作　　者：范红旗[1] 翟庆林[1] 王胜[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《电子测量与仪器学报》2008年第1期99-103,共5页Journal of Electronic Measurement and Instrumentation

摘　　要：中频采样是数字正交鉴相系统中的一项关键技术,具有锐截止特性的中频采样滤波器可以改善鉴相系统的性能。针对低通滤波法鉴相系统中的滤波器设计,提出了一种锐截止中频采样滤波器设计的有效方法,使所需的运算量及存储量大幅度缩减。最后,提出了一种基于IP(Intelligent Property)核的中频采样滤波器的具体实现方案。As a key technology in digital quadrature demodulation system, the direct IF sampling filter with sharp cutting-off transition band can improve the performance of demodulation system. Aiming at the design of the low pass filter in quadrature demodulation system implemented by low pass filtering method of IF sampling technique, firstly the conditions of simplifying filter design are analyzed and the simplified equations are deduced in this paper, then a simplified sharp cutting-off filter design method based on IP core implementation is proposed, which can remarkably reduce the number of multiplier accumulate operations, as well as the consumed cost of RAM. Finally, design schemes for IP （ Intelligent Property） core-based IF sampling filter and a digital quadrature demodulation system using the proposed filter design are proposed.

关 键 词：正交鉴相 中频采样 锐截止 FIR IP核 

分 类 号：TN957.5[电子电信—信号与信息处理]