【正文】 由本人承擔(dān)。 河西學(xué)院本科生畢業(yè)論文（設(shè)計(jì)）誠信聲明 本人鄭重聲明：所呈交的本科畢業(yè)論文，是本人在指導(dǎo)老師的指導(dǎo)下，獨(dú)立進(jìn)行研究工作所取得的成果，成果不存在知識產(chǎn)權(quán)爭議，除文中已經(jīng)注明引用的內(nèi)容外，本論文不含任何其他個人或集體已經(jīng)發(fā)表或撰寫過的作品成果。對本文的研究做出重要貢獻(xiàn)的個人和集體均已在文中以明確方式標(biāo)明。 本科畢業(yè)論文（設(shè)計(jì)）作者簽名： 二 〇 一 一 年五月二十 六 日 I 目 錄 摘 要 .................................................................................................................................................. 1 ABSTRACT ........................................................................................................................................ 1 正 文 ................................................................................................................................................ 2 1 緒 論 ............................................................................................................................................... 2 信號發(fā)生器現(xiàn)狀 ......................................................................................................................... 2 單片機(jī)在低頻信號發(fā)生器中的應(yīng)用 ............................................................................................. 2 2 系統(tǒng)設(shè)計(jì) ......................................................................................................................................... 3 系統(tǒng)方案的比較 ......................................................................................................................... 3 選題論證 ............................................................................................................................. 3 方案選擇 ............................................................................................................................. 4 芯片選擇模塊 ............................................................................................................................ 4 3 硬件電路的設(shè)計(jì) ............................................................................................................................... 5 系統(tǒng)框圖 ................................................................................................................................... 5 資源分配 .................................................................................................................................. 5 最小單片機(jī)系統(tǒng)設(shè)計(jì) .................................................................................................................. 6 各部分電路原理 ....................................................................................................................... 10 DAC0832 芯片原理 .......................................................................................................... 10 LM324工作原理 .............................................................................................................. 13 電路原理 ................................................................................................................................. 14 4 軟件設(shè) 計(jì) ....................................................................................................................................... 14 主程序流程圖 .......................................................................................................................... 15 方波程序流程圖 ....................................................................................................................... 16 鋸齒波程序流程圖 ................................................................................................................... 17 正弦波程序流程圖 ................................................................................................................... 17 5 仿真結(jié)果 ....................................................................................................................................... 18 6 測試結(jié)論 ....................................................................................................................................... 20 7 結(jié)束語 ........................................................................................................................................... 22 參 考 文 獻(xiàn) ..................................................................................................................................... 23 附 錄 ................................................................................................................................................ 24 致 謝 ................................................................................................................................................ 32 文獻(xiàn)綜述 ........................................................................................................................................... 33 河西學(xué)院本科生畢業(yè)論文（設(shè)計(jì)）題目審批表 ......................................................... 錯誤 !未定義書簽。 河西學(xué)院本科畢業(yè)論文（設(shè)計(jì)）開題報告 ................................................................ 錯誤 !未定義書簽。 河西學(xué)院畢業(yè)論文（設(shè)計(jì)）指導(dǎo)教師評審表 ............................................................ 錯誤 !未定義書簽。 1 基于 AT89S51 低頻信號發(fā)生器的 設(shè)計(jì)與實(shí)現(xiàn) 摘 要 本 信號 發(fā)生器 的設(shè)計(jì) 采用 AT89S51 單片機(jī)作為控制核心，外圍采用 數(shù)字 /模擬轉(zhuǎn)換電路（ DAC0832）、運(yùn)放電路（ LM324）、按鍵和 LED 顯示燈電路 。 由于采用 了 LM324 運(yùn)算放大器，使其電路更 加具有較高的穩(wěn)定性能，性能比高。 本設(shè)計(jì) 能夠產(chǎn)生方波、鋸齒波、正弦波，并且 所產(chǎn)生的波形在一定 的幅頻 范圍 內(nèi) 可調(diào) ,波形準(zhǔn)確并且平滑。 關(guān)鍵詞： AT89S51；低頻信號；發(fā)生器；運(yùn)放器 ABSTRACT This signal generator is designed using AT89S51 as control core and periphery using digital/analog converter circuit (DAC0832), operational amplifier circuits (LM324), button and LED indicator light circuit. AT89S51 and a DAC0832 digitaltoanalog converter ponent of lowfrequency signal generator consisting digital. As a result of the LM324 operational amplifier to the circuit more stable high performance, high performance ratio. This circuit is clear, easy to find failure error, simple and convenient. This design can produce square wave, sawtooth wave, sine wave, and produces waveform in a certain amplitude and frequency range is adjustable, waveform also accurate and smooth. The system is