当今电子技术的发展可谓是与时俱进，电子产品的更新换代更是日新月异。因而电子设计也由传统的手工设计过程向先进的自动化设计发展（即从CAD到EDA及ESDA: Electronic System Design Automation）。熟悉并掌握现代设计工具，就成为电子信息设计人员必备的技术。数字滤波作为数字信号处理技术的重要组成部分，广泛应用于诸如信号分离、恢复、整形等多种场合中，本文讨论的FIR滤波器因其具有严格的线性相位特性而得到广泛的应用。本设计用硬件语言VHDL来实现FIR数字滤波器功能。首先介绍VHDL语言的发展和由来、基本结构、规定、优点。接着简单介绍硬件语言的应用平台MAX+PLUSII软件，FIR滤波器的基本理论，然后通过软硬件结合的方法阐述了滤波器结构化的设计思想和大体的设计流程，最后进入本设计的核心设计部分，用VHDL语言设计FIR滤波器电路，着重对有限长单位冲激响应（FIR）滤波器设计过程进行了详尽的介绍。设计参数可调的FIR低通滤波器，以EP1K30QC208-2为核心，包括A/D转换电路，数码显示电路，以试验箱提供的模拟信号为输入进行了实际滤波效果的测试。实验系统的测试表明，与传统的数字滤波器相比较具有更好的实时性，准确性，灵活性和实用性。
关键词：VHDL，有限长单位冲激响应（FIR）数字滤波器，MAX+PLUSII软件
Now, you can say that the electronic technology is developing with a very high speed. And the electronic products renewal speed it may be said changes with each new day, so electronic design has been changing from the traditional manual design to the advanced automated design (from CAD to EDA and ESDA: Electronic System Design Automation). Thus is familiar with and grasps these modern design tools, has become the electronic information to design a personnel necessary technology. The digital filters is an important part of digital signal processing and used widely in variety of application such as a signal separation, restoration or shaping. FIR filter discussed in this paper is widely used because of its strict phase distortion sharp cut-off characteristic. This design emphasis point is realizes the FIR digital filter function with hardware language VHDL. The article first introduced the VHDL language’s development and their origin, their basic structures, the stipulation and the merit .And then that simple was introduce hardware description language application platform MAX+PLUSII software and the basic theory of the FIR filter. Then the method which unifies through the software and hardware elaborated the filter structure design thought and the roughly design flow. After carries on the simple explanation to the programmable logical component . Finally goes to the core design part, designing the FIR filter circuit with VHDL language. Introduce the process of FIR digital filter in details. Designed a FIR low pass filter that could adjust the parameters: the main IC is EP1K30QC208-2 ,including A/D convert circuit and digital display circuit. Chamber to the analog signal input to the filtering effect of the actual test. The experiment prove that this system is real-time, veracity, agile and practicability comparing with the traditional filter.175
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