【毕业论文】CIC滤波器的设计与仿真.docVIP

CIC滤波器的设计与仿真 摘要 CIC滤波器已经被证明是在高速抽取和插值系统中非常有效的单元，具有结构简单,易于工程实现的特点。CIC滤波器是数据通讯中的常用模块，一般用于数字下变频(DDC)和数字上变频(DUC)系统，随着数据传输率的增加，级联梳状滤波器(CIC)的应用变得尤为重要。.CIC滤波器的主要特点是,仅利用加法器、减法器和寄存器(无需乘法器)，适合工作在高采样率。在数字下变频(DDC)中,CIC(级联积分梳状)滤波器起着重要的作用.它主要用于采样速率的抽取,同时具有低通滤波的作用。针对软件无线电中的多速率信号处理,结合二进制补码表示法,介绍了积分梳状滤波器的基本组成原理,以及决定滤波器性能的参数选择。本文在研究CIC滤波器基本原理的基础上，对其进行了FPGA仿真、综合，并最终应用在工程中，达到了设计要求。 关键字：CIC滤波器 高采样率 低通滤波 Abstract CIC filter has been proven in high-speed extraction and interpolation system is very effective unit, is simple in structure, easy to engineering characteristics. CIC filter is commonly used in data communications module, commonly used for digital down conversion (DDC) and figures on the frequency (DUC) system, with data transfer rate of increase, Cascade comb filter (CIC) Application of change Even more important. . CIC filter the main characteristics is that the only use addition, subtraction and register (no multiplier), suitable for work in high-sampling rate. In the digital down conversion (DDC) in, CIC (cascade integral comb) filters play an important role. It is mainly used for sampling rate of extraction, while a low pass filter role. For software radio in the multi-rate signal processing, with binary-code that, on the integral comb filter composed of the basic principles of filter performance and to determine the parameters of choice. CIC filter paper on the basic principles on the basis of , Its simulation of the FPGA, integrated and end-use applications in engineering, to design requirements. Keywords: CIC filter, high sampling rates, low pass filter 目录 摘要 I Abstract II 目录 III 前言 1 1.滤波器的设计 2 1.1 引言 2 1.2 滤波器的原理 2 1.2.1 CIC滤波器的概述 2 1.2.2 CIC滤波器的原理 5 1.2.3 单级CIC滤波器 9 1.2.4 多级CIC滤波器 10 1.3. CIC滤波器的指标的确定 11 1.3.1 幅度指标 11 1.3.2 相位指标 13 1.3.3 低通CIC滤波器的参数 14 1.3.4 CIC滤波器的数制选择 14 1.4 CIC滤波器设计中的几个问题及解决方法 15 1.4.1 CIC滤波器设计中的溢出问题及解决方法 15 1.4.2 CIC滤波器特性改善 20 2.CIC滤波器的MATLAB设计 22 2.1MATLAB 22 2.1.1MATLAB的主要功能与特点： 22 2.2 FDATool界面设计 23 2.2.1 FDATool的介绍 23 2.3 低通CIC滤波器设计实例 24 2.3