基于EDA（电子设计自动化）技术的多功能低频信号发生器.docVIP

摘 要 随着科技的发展，对信号发生器的各方面要求越来越高。传统的信号发生器由于波形精度低，频率稳定性差等特点，已经不能满足许多实际应用的需要。而且市场上出售的器价格昂贵实际需要，设计一种发生器EDA（电子设计自动化）技术的低频信号发生器，它采用CPLD（复杂可编程逻辑器件）与单片机结合的方法，可以产生递增锯齿波、递减锯齿波、三角波、阶梯波、方波、正弦波共6种波形。它运用DDS（直接数字频率合成技术）技术的基本工作原理，通过Quartus II 9.0软件和VHDL语言编程，由CPLD控制数据输出，经数模转化器转换成相应的模拟信号。整个信号发生器以单片机（STC89C52RC）为控制中心，主要由电源模块、按键电路模块、液晶显示模块、调幅模块、波形生成模块、滤波模块等组成。另外为了更好的完成本次毕设，本次设计CPLD选用Altera公司的EPM240CT100C5。 关键词：低频信号发生器EDA；DDS；VHDL With the development of technology, signal generator have become increasingly demanding in all aspects. Traditional signal generators can not meet the needs of many practical applications because of low precision waveform, frequency stability characteristics of poor and high price in the market. According to the really demands, we design a low-frequency signal generator. In this paper, we introduce a low-frequency signal generator based on EDA (Electronic Design Automation) technology. It uses the method of combining CPLD (Complex Programmable Logic Devices) and SCM which can generate incremental ramp wave, decreasing saw tooth wave, triangle wave, ladder wave, square wave, sine wave. It uses the basic working principle of DDS(Direct Digital Frequency Synthesis) technology, through the Quartus II 9.0 software and the VHDL programming language, and the CPLD control data output by the digital-analog converter which converts the corresponding analog signal .The SCM (STC89C52RC) is the control center of the signal generator which is composed of power supply module, the key circuit module, LCD module, the AM module, the waveform generating module, filter module and other components. In addition to better completion of this complete set, this design uses Altera Corporation EPM240CT100C5. Key words：a low-frequency signal generator；EDA；CPLD；DDS；VHDL 目录 摘 要 1 Abstract 3 1 绪论 6 1.1 研究课题的目的及意义 6 1.2 国内外现状 7 1.3 本设计的目标 7 2 信号发生器设计方案 9 2.1 传统的信号发生器设计方案 9 2.2 基于微处理器和数字/模拟转换器的设计方案 9 2.3 直接数字频率合成技术 10 2.4 DDS方案选择 11 3 CPLD及开发语言简介 15 3.1 CPLD简介 15 3.2 开发语言和开发环境的选择 16 3.2.1