【正文】 許多方面實(shí)際應(yīng)用的需求。譬如在示波器、電視機(jī)等設(shè)備中，為了使電子按照一定規(guī)律運(yùn)動，以利用熒光屏顯示圖像，常用到鋸齒波產(chǎn)生器作為時基電路。在科學(xué)研究、工程教育及生產(chǎn)實(shí)踐中，如工業(yè)過程控制、教學(xué)實(shí)驗(yàn)、機(jī)械振動試驗(yàn)、動態(tài)分析、材料試驗(yàn)、生物醫(yī)學(xué)等領(lǐng)域，常常需要用到低頻信號發(fā)生器?，F(xiàn)在，許多信號發(fā)生器帶有微處理器，因而具備了自校、自檢、自動故障診斷和自動波形形成和修正等功能，可以和控制計(jì)算機(jī)及其他測量儀器一起方便的構(gòu)成自動測試系統(tǒng)。目 錄摘要 ............................................................................................................................................IABSTRACT ..........................................................................................................................II第一章 前言 ...........................................................................................................................1 課題背景 ..........................................................................................................................1 信號發(fā)生器的現(xiàn)狀和發(fā)展趨勢 ......................................................................................1 論文主要內(nèi)容 ..................................................................................................................2第二章 信號發(fā)生器方案論證與選擇 ............................................................................3 方案的論證與選擇 ..........................................................................................................3 設(shè)計(jì)原理簡介 ..................................................................................................................3 設(shè)計(jì)功能 ..........................................................................................................................4第三章 硬件設(shè)計(jì)..................................................................................................................5 主要元器件介紹 ..............................................................................................................5 AT89C52 單片機(jī).......................................................................................................5 DAC0832 ....................................................................................................................6 LCD 液晶屏：............................................................................................................8 硬件原理框圖 ...................................................................................................................9 單片機(jī) AT89C52 外圍電路的設(shè)計(jì) ................................................................................9 時鐘電路..................................................................................................................10 復(fù)位電路..................................................................................................................10 鍵盤接口電路..........................................................................................................11 LCD 顯示電路 ................................................................................................................12 數(shù)/模轉(zhuǎn)換及放大電路 ...................................................................................................12 電源電路 ........................................................................................................................13第四章 軟件設(shè)計(jì)................................................................................................................15 軟件設(shè)計(jì)流程 ................................................................................................................15 信號產(chǎn)生子程序 ............................................................................................................16 三角波程序模塊.......................................................................................................16 正弦波程序模塊.......................................................................................................16 方波程序模塊...........................................................................................................17第五章 系統(tǒng)仿真與電路測試 ........................................................................................19 軟件仿真 .........................................................................................................................19 方波仿真...................................................................................................................19 三角波仿真圖..........................................................................................................21 正弦波仿真圖...........................................................................................................22 硬件電路測試 .................................................................................................................23 結(jié)果分析 .........................................................................................................................24結(jié)論 .........................................................................................................................................25參考文獻(xiàn) ................................................................................................................................26致謝 .........................................................................................................................................27附錄 A 源代碼 .....................................................................................................................28附件 B 主要元器件清單 ...................................................................................................36附件 C 系統(tǒng)電路圖 ............................................................................................................37第一章 前 言 課題背景隨著電子測量及其他部門對各類信號發(fā)生器的廣泛需求及電子技術(shù)的迅速發(fā)展，促使信號發(fā)生器種類增多，性能提高。Single chip microputer。經(jīng)測試該設(shè)計(jì)方案線路優(yōu)化，結(jié)構(gòu)緊湊，性能優(yōu)越，滿足設(shè)計(jì)要求。本文設(shè)計(jì)了簡易低頻信號發(fā)生器，