便攜式低頻信號發(fā)生器

電子論文編號:JD1098  論文字?jǐn)?shù):21474,頁數(shù):65

目  錄
1.緒  論 1
1.1課題背景、目的及意義 1
1.2設(shè)計要求和任務(wù) 2
2.便攜式低頻信號發(fā)生器的方案研究 3
2.1方案提出和論證 3
2.2模塊結(jié)構(gòu)劃分 4
3.各模塊具體設(shè)計 6
3.1 AT89C51單片機介紹 6
3.2最小應(yīng)用系統(tǒng) 12
3.3 8255擴展電路 15
3.4 4*6距陣式按鍵電路 21
3.5 128*64LCD顯示電路 30
3.6 D/A轉(zhuǎn)換電路 37
3.7 I/V轉(zhuǎn)換波形輸出電路 41
4.電路軟件設(shè)計和體統(tǒng)調(diào)試 47
4.1軟件設(shè)計流程圖 47
4.2 Keil和Protues介紹和聯(lián)調(diào) 48
4.3 軟硬模塊調(diào)試 50
4.4調(diào)試遇到的問題和解決辦法 51
4.5調(diào)試工具及測試儀器 56
5.產(chǎn)品說明 57
5.1 產(chǎn)品的性能和應(yīng)用范圍 57
5.2產(chǎn)品的使用說明 57
總  結(jié) 59
致  謝 60
參考文獻(xiàn) 61
附錄A 硬件電路圖
附錄B軟件程序
附錄C 英文翻譯

[摘要]信號發(fā)生器是一種常用的信號源，廣泛地應(yīng)用于電子電路、自動控制系統(tǒng)和教學(xué)實驗等領(lǐng)域。目前使用的信號發(fā)生器大部分是函數(shù)信號發(fā)生器，且特殊波形發(fā)生器的價格昂貴。所以本設(shè)計使用的是AT89c51單片機構(gòu)成的發(fā)生器，可產(chǎn)生三角波、方波、正弦波等多種特殊波形和任意波形，波形的頻率可用程序控制改變。在單片機上加外圍器件距陣式鍵盤，通過鍵盤控制波形頻率的增減以及波形的選擇，并用了LCD顯示頻率大小。在單片機的輸出端口接DAC0832進(jìn)行D/A轉(zhuǎn)換，再通過運放進(jìn)行波形調(diào)整，最后輸出波形接在示波器上顯示。本設(shè)計具有線路簡單、結(jié)構(gòu)緊湊、價格低廉、性能優(yōu)越等優(yōu)點。
 [關(guān)鍵詞]信號發(fā)生器；單片機；波形調(diào)整

                         
The design of low- frequency function signal-generator

 [Abstract]Signal-generator is a kind of signal source in common use, broadly applied at the electronics electric circuit, auto control system and teaching experiment etc. Currently used mostly function signal generator signal generator, waveform generator and a special price of expensive . So the dissertation is usage of the AT89s51 single-chip microcomputer constitute of wave-form generator, which can generate triangle wave, square wave, sine wave etc variety wave-form, the period of wave can be controlled by procedure, at outer circle spare part of the machine, plus independence type keyboard , which can control wave increase or decrease of form-frequency and the choice of wave-form, at the same time LED display frequency size. The output of the machine connect DAC0832 to carry on a DA conversion，again pass operation amplifier to put an end exportation wave-form. This design has advantage of simple circuit, tightly packed structure, cheap price, superior function etc.
 [Keywords]signal generator;  MCU;  wave-form adjustment