【正文】 高的要求。它能夠提供正弦波、余弦波、方波、三角波等幾種常用標準波形，產(chǎn)生其它波形時，需要采用較復(fù)雜的電路和機電結(jié)合的方法。關(guān)鍵詞：信號發(fā)生器；DDS；FPGA；DE2Practical FPGAbased multi function signal generator design and productionAbstractMulti function signal generator has bee the most widely used in modern testing field of general instrument, and has represented one of the development direction of the source. Direct digital frequency synthesis (DDS) is a totaly digital frequency synthesis technology, which been put forward in the early 1970s. Using a lookup table method to synthetic waveform, it can satisfy any requirement of waveform produce. Due to the field programmable gates array (FPGA) with high integrity, high speed, and large storage properties, it can realize the DDS technology effectively, increase signal generator’s performance and reduce production costs.Firstly, this article introduced the function signal generator of the research background and DDS theory. Then, it described how to design a DDS module by Verilog HDL, and introduced various signal occurs theory, method and the implementation process, Verilog HDL code and simulation results.This paper also introduces the function of DE2 multimedia development platform, and pleted most of the functions of multifunction signal generator on DE2 platform finally. Including the occurrence of multiple signal and the manmachine interface which posed by LCD display and key input. Digitaltoanalog converters is DAC902, which produced by pany BURRBROWN.This signal generator can output eight different kinds of signals, and the frequency of the output signal, phase and modulation frequency signal also can be modifyed.Key Words: Signal generator。文中還介紹了 Altera 公司的 DE2 多媒體開發(fā)平臺的部分功能及使用，并最終利用 DE2 平臺完成了多功能信號發(fā)生器的大部分功能。由于現(xiàn)場可編程門陣列(FPGA)具有高集成度、高速度、可實現(xiàn)大容量存儲器功能的特性，能有效地實現(xiàn) DDS 技術(shù)，極大的提高函數(shù)發(fā)生器的性能，降低生產(chǎn)成本。直接數(shù)字頻率合成(DDS) 是二十世紀七十年代初提出的一種全數(shù)字的頻率合成技術(shù)，其查表合成波形的方法可以滿足產(chǎn)生任意波形的要求。文中詳細地介紹了多種信號的發(fā)生理論、實現(xiàn)方法、實現(xiàn)過程、部分Verilog HDL 代碼以及利用 Modelsim 仿真的結(jié)果。該信號發(fā)生器能輸出 8 種不同的信號，并且能對輸出信號的頻率、相位以及調(diào)制信號的頻率進行修改設(shè)定。 DE2目 錄論文總頁數(shù)：34 頁1 引言 ........................................................................1 課題背景 ............................................................1 國內(nèi)外波形發(fā)生器的發(fā)展現(xiàn)狀 ..........................................1 本文研究的主要內(nèi)容 ..................................................22 信號發(fā)生器原理 ..............................................................2 直接數(shù)字頻率合成技術(shù)的基本原理 ......................................2 相位偏移控制 ........................................................3 多種信號的發(fā)生 ......................................................3 方波的發(fā)生 ......................................................3 三角波發(fā)生 ......................................................4 鋸齒波發(fā)生 ......................................................4 PWM 信號發(fā)生 ....................................................4 SPWM 信號發(fā)生 ...................................................5 AM 信號發(fā)生 .....................................................5 FM 信號發(fā)生 .....................................................6 DDS 的特點 ..........................................................7 DDS 的優(yōu)點 ......................................................7 DDS 系統(tǒng)的缺點 ..................................................73 系統(tǒng)整體設(shè)計 ................................................................8 硬件部分 ............................................................8 DE2 實驗板 ......................................................8 LCD 模塊 ........................................................9 DAC902.........................................................11 基于 VERILOG 的 FPGA 設(shè)計 ............................................12 軟件工具 ...........................................................12 Modelsim.......................................................12 Quartus........................................................12 系統(tǒng)設(shè)計 ...........................................................13 系統(tǒng)初始化模塊 .................................................13 按鍵模塊和 LCD 模塊 .............................................13 RAM 模塊 .......................................................14 數(shù)據(jù)轉(zhuǎn)換模塊 ...................................................15 DAC 驅(qū)動模塊 ...................................................15 系統(tǒng)的運行 .....................................................154 VERILOG HDL 代碼實現(xiàn)與仿真 ................................................15 信號發(fā)生器模塊 .....................................................15 頻率控制字和相位累加器 .........................................15 相位偏移控制 ...................................................16 正弦波發(fā)生模塊 .................................................17 方波發(fā)生模塊 ...................................................17 三角波發(fā)生模塊 .................................................18 鋸齒波發(fā)生模塊 .................................................18 PWM 信號發(fā)生模塊 ...............................................19 SPWM 信號發(fā)生模塊 ..............................................19 AM 信號發(fā)生模塊 ................................................20 FM 信號發(fā)生模塊 ...............................................21 按鍵輸入模塊 .......................................................22 LCD 顯示模塊 .......................................................23 RAM 模塊 ...........................................................24 數(shù)據(jù)轉(zhuǎn)換模塊 .......................................................255 系統(tǒng)測試 ...................................................................26 控制及顯示部分測試 .................................................27 輸出頻率測試 .......................................................27 信號發(fā)生測試 .......................................................28 正弦波、方波、三角波、鋸齒波測試 ...............................28 PWM 信號測試 ...................................................29 SPWM 信號測試 ..................................................29 AM 信號測試 ....................................................29 FM 信號測試 ....................................................30結(jié) 論 ......................................................................31參考文獻 .....................................................................32致 謝 ......................................................................33聲