【正文】 broadband highvoltage operational amplifier OPA642 as voltage follower input stage, the middle amplification use the filter circuit which posed by voltagecontrolled amplifier AD603 and the AD818, the final stage power amplification stage is to use lownoise amplifier and highvoltage highspeed buffer to improve the RMS of output voltage. Using single chip and digital control signal algorithm have obtained reasonably Preamplifier and accurate magnification, while the LCD display. The paper described the design of the subject in detail, the front buffer, the middle zoom level, the final stage power amplification stage, and its circuit design, introduced the hardware structure and program flow, and finally presented the preliminary results of the system and the systematic next development prospects. Keywords: Broadband DC low noise amplifier, the front buffer, the middle zoom level, the final stage power amplification stage 南京師范大學(xué)電氣與自動(dòng)化工程學(xué)院畢業(yè)設(shè)計(jì)論文 3 第 1 章 緒論 本課題研究 背景 隨著我國(guó)國(guó)民經(jīng)濟(jì)的發(fā)展和綜合國(guó)力的增強(qiáng)，人民的生活質(zhì)量獲得很大提高。 利用單片機(jī)及數(shù)字算法控制信號(hào)得到了合理的前級(jí)放大和精確的放大倍數(shù)，同時(shí)由 液晶顯示屏顯示出來 。 本次設(shè)計(jì) ，充分的利用了數(shù)字系統(tǒng)以模擬的優(yōu)點(diǎn)并結(jié)合了單片機(jī)預(yù)置和控制 增益 放大器，這使系統(tǒng)的精確度和可控性得到了大大的提高。南京師范大學(xué)電氣與自動(dòng)化工程學(xué)院畢業(yè)設(shè)計(jì)論文 I 目 錄 摘要 ................................................................................................................................... 1 Abstract ........................................................................................................................... 2 第 1 章 緒論 ................................................................................................................. 3 本課題研究背景 .................................................................................................. 3 本課題研究意義 .................................................................................................. 3 本課題主要研究?jī)?nèi)容 .......................................................................................... 4 第 2 章 系統(tǒng)的設(shè)計(jì)方案論證 ................................................................................ 5 系統(tǒng)總體方案 ...................................................................................................... 5 前級(jí)緩沖電路方案論證 ..................................................................................... 5 中間放大級(jí)方案論證 .......................................................................................... 6 末級(jí)功率放大方案論證 ...................................................................................... 6 系統(tǒng)控制顯示論證 .............................................................................................. 7 系統(tǒng)處理器的選擇 .................................................................................. 7 系統(tǒng)顯示的選擇 ...................................................................................... 7 濾波電路方案論證 .............................................................................................. 8 第 3 章 系統(tǒng)的理論分析與計(jì)算 ............................................................................ 9 帶寬增益積分析 ................................................................................................. 9 通頻帶內(nèi)增益起伏控制分析 ........................................................................... 10 抑制零點(diǎn)漂移分析 ........................................................................................... 10 系統(tǒng)固有噪聲分析抑 ........................................................................................ 11 線性相位分析與計(jì)算 ....................................................................................... 11 放大器穩(wěn)定性分析 ............................................................................................ 12 第 4 章 系統(tǒng)的電路原理和設(shè)計(jì) .......................................................................... 13 前級(jí)跟隨電路設(shè)計(jì) ........................................................................................... 13 中間放大級(jí)和濾波電路設(shè)計(jì) ............................................................................ 13 壓控運(yùn)放 AD603 原理與電路 .............................................................. 14 控制電壓產(chǎn)生電路 ................................................................................ 15 濾波電路設(shè)計(jì) ........................................................................................ 17 末級(jí)功率放大電路 ........................................................................................... 18 人機(jī)接口電路 .................................................................................................... 20 液晶接口電路 ........................................................................................ 20 鍵盤接口電路 ........................................................................................ 21 穩(wěn)壓電源電路 ................................................................................................. 23 第 5 章 系統(tǒng)的軟件設(shè)計(jì) ........................................................................................ 25 系統(tǒng)總體軟件設(shè)計(jì) ......................................................................................... 25 液晶顯示部分軟件設(shè)計(jì) ................................................................................... 26 鍵盤管理模塊軟件設(shè)計(jì) .................................................................................... 28 I2C 總線軟件設(shè)計(jì) ................................................................................ 28 ZLG7290 軟件設(shè)計(jì) ............................................................................. 30 單片機(jī)控制 DA 產(chǎn)生電壓模塊軟件設(shè)計(jì) ....................................................... 32 第 6 章 系統(tǒng)調(diào)試及測(cè)試結(jié)果 .............................................................................. 34 調(diào)試過程中若干問題的解決 ........................................................................... 34 系統(tǒng)防干擾措施 .................................................................................. 34 南京師范大學(xué)電氣與自動(dòng)化工程學(xué)院畢業(yè)設(shè)計(jì)論文 II 電路設(shè)計(jì)中遇到的問題及解決方案 .................................................. 34 系統(tǒng)調(diào)試和測(cè)試結(jié)果 ....................................................................................