數字信號發生器的設計

應用物理學論文編號:WLX097  字數:5225,頁數:24

目錄
中文摘要..........................................................................1
英文摘要..........................................................................2
目錄..............................................................................3
第1章     緒論...................................................................5
      1.1  研究的動機、目的及意義.................................................5
          1.1.1  研究的動機與目的.................................................5
          1.1.2  研究的意義.......................................................5
      1.2  論文內容概述...........................................................5
第2章     壓控振蕩器（VOC）的設計................................................6
      2.1  頻率發生器方案的選擇...................................................6
      2.2  VOC的設計..............................................................7
第3章     功率放大器（AMP）的設計................................................9
      3.1  功率放大器的設計.......................................................9
第4章     單片機控制板（MCU）的設計..............................................10
      4.1  電壓比較器的設計（模數轉換）...........................................10
      4.2  鎖相環（PLL）的頻率倍增................................................10
      4.3  十六進制計數器的設計..................................................11
      4.4  A/D和D/A的運用.......................................................12
          4.4.1  A/D的使用.......................................................12
          4.4.2  D/A的使用.......................................................13
      4.5  人機對話的設計........................................................13
      4.6.  電源的計.............................................................14
第5章     電路的硬件制作、調試、測試.............................................16
      5.1  硬件電路設計說明......................................................16
      5.2  調試說明..............................................................16
      5.3  測試說明..............................................................17
第6章     軟件設計...............................................................18
      6.1  軟件流程圖............................................................18
第7章     結束語.................................................................21
致謝.............................................................................22
參考文獻.........................................................................23
附錄A   完整電路圖...............................................................24

摘     要

 本文提出了一種音頻信號發生器的設計方法，音頻信號發生器采用單片計算機控制掃頻，數字模擬相結合，正弦波輸出，失真小，穩定性好，頻率范圍覆蓋整個音頻頻域，特別適合檢聽揚聲器純音。對數掃頻和手動調頻兩種工作方式，掃頻起點、終點及掃頻時間可任意設定，手動調頻有粗調和微調，可以精確調節頻率。采用128×64點陣液晶塊顯示，同時顯示頻率和電壓值。帶有同步輸出端。

關鍵詞：  單片機 壓控振蕩器 液晶塊顯示 功率放大器

Abstract
 A procedure is about a way of how to design  a kind of Audio sweep Generator, the device is a novel audio sweep generator, controlled by MCU(Micro Controller Unit), combined with digital and analog circuits. The characteristics of this generator are as follows: Strong stability, sine wave output, tone of any loudspeaker. There are two kinds of working ways of logarithm sweep and manual frequency modulation. Besides, the start point , end point and sweep time can be set at random, and the frequency can be regulated accurately according to manual frequency modulation including rude frequency modulation and fine frequency modulation. The values of signal frequency and voltage are displayed synchronously on the LCD screen of 128*64 dot matrix. And there is a synchronous output.
Keywords：MCU;  VOC;  LCD;  AMP