【正文】 n and displaying capability, we design the operation panel of AWG with LabWindows/CVI. On the panel user can choose conventional waves such as sine wave, square wave, triangle wave, sawtooth wave, white noise ect., or draw waves by hand, and set wave parameters to control instrunment generate corresponding waveform, which embodies the “arbitrary” character of AWG.. The result of experimentation proves that this AWG has attained the desire of design. Keywords： DDS FPGA USB Virtual Instrument 目錄 目錄 第一章 緒論 .......................................................... 1 引言 ..................................................................................................................... 1 任意波形發(fā)生器的功能 ..................................................................................... 2 國(guó)內(nèi)外發(fā)展現(xiàn)狀 ................................................................................................. 3 課題研究目標(biāo) ..................................................................................................... 4 主要研究工作及論文內(nèi)容安排 ......................................................................... 5 第二章 任意波形發(fā)生器的 理論分析 ...................................... 7 頻率合成技術(shù)及性能指標(biāo) ................................................................................. 7 DDS 原理分析 ................................................................................................... 10 DDS 基本結(jié)構(gòu) ......................................................................................... 11 DDS 原理 ................................................................................................. 12 DDS 技術(shù)特點(diǎn) ......................................................................................... 16 DDS 輸出特性 ................................................................................................... 18 理想情況下 DDS 的頻譜特性 ............................................................... 18 非理想情況下 DDS 的頻譜特性 ........................................................... 20 DDS 雜散抑制方法 ........................................................................................... 25 第三章 任意波形發(fā)生器的硬件電路設(shè)計(jì) ................................. 29 系統(tǒng)設(shè)計(jì)方案 ................................................................................................... 29 系統(tǒng)總體結(jié)構(gòu) ................................................................................................... 29 功能模塊設(shè)計(jì) ................................................................................................... 30 FPGA 電路 ............................................................................................... 30 D/A 轉(zhuǎn)換電路 .......................................................................................... 33 濾波器的設(shè)計(jì) ......................................................................................... 35 放大衰減及直流偏置電 路 ..................................................................... 39 外部接口電路 ......................................................................................... 42 電源電路 ................................................................................................. 45 印制電路板的設(shè)計(jì) ........................................................................................... 45 第四章 FPGA 邏輯設(shè)計(jì) ................................................ 47 FPGA 及其開(kāi)發(fā)環(huán)境簡(jiǎn)介 ................................................................................. 47 現(xiàn)場(chǎng)可編程門(mén) 陣列簡(jiǎn)介 ......................................................................... 47 Quartus II 集成開(kāi)發(fā)環(huán)境 .................................................................. 48 任意波形發(fā)生器的 FPGA 實(shí)現(xiàn) ....................................................................... 49 地址譯碼和控制數(shù)據(jù)寄存模塊 ............................................................. 50 移位寄存器控制邏輯 ............................................................................. 51 數(shù)字電位器控制邏輯 ............................................................................. 52 相位累加器的設(shè)計(jì) ................................................................................. 53 基于 FPGA 的低成本虛擬測(cè)量系統(tǒng)實(shí)現(xiàn) 波形存儲(chǔ)器的設(shè)計(jì) ................................................................................. 54 任意波形調(diào)制器的研究 ................................................................................... 56 幅度調(diào)制 ................................................................................................. 57 頻率調(diào)制 ................................................................................................. 58 數(shù)字調(diào)制 ................................................................................................. 59 相位抖動(dòng)注入技術(shù)的研究 ............................................................................... 60 第五章 任意波形發(fā)生器的軟件設(shè)計(jì) ..................................... 61 系統(tǒng)軟件結(jié)構(gòu) ................................................................................................... 61 固件程序設(shè)計(jì) ................................................................................................... 61 功能分析 ................................................................................................. 62 固件程序結(jié)構(gòu) ......................................................................................... 62 固件程序開(kāi)發(fā) ......................................................................................... 63 USB 設(shè)備驅(qū)動(dòng)程序 ........................................................................................... 64 驅(qū)動(dòng)程序的實(shí)現(xiàn) ..................................................................................... 64 USB 設(shè)備的訪問(wèn) ..................................................................................... 65 用戶應(yīng)用程序 ................................................................................................... 65 開(kāi)發(fā)平臺(tái) LabWindows/CVI .................................................................. 66 任意波形發(fā)生器軟件界面 ..................................................................... 66 波形數(shù)據(jù) 的產(chǎn)生 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