【正文】 ement and signal output of two parts, the voltage measurements of analog amplifier module, cooperate, A/D conversion module, display module, Through the sunplus microcontroller, within the permitted error display measuring voltage. With Digital signals directly to the Digital Frequency synthesizer (as some biosynthesis, referred to as DDFS) as the core of DDS or, on DDS chip inside AT89S52 control, using standard output waveform, programming, preset, step Frequency voltage output reached Frequency adjustable step. Through measuring and testing the basic topic pleted and all play a part of the requirements and have their own innovation. This system works based on the FPGA with some outer circuits, which include signal processing, A/D converter, D/A convention, input/output and source modules. This system is designed by the principle of module and VHDL program. So it has the advantages of expansibility and replantation. This system has the functions of measuring and supplying alternate current. When the outer input signal is measured, it is send to the A/D circuit through the signal processing module. Then through the A/D converter, the signal is send to the core of the FPGA module to calculate the virtual value of the voltage. Then the function of milli voltage meter is realized and the result can be displayed on the LCD. When outputting the source, with the help of the FPGA39。 本文是簡易數(shù)字交流毫伏表的一個新型設計方法的嘗試。經測試，交流電壓測量的誤差控制在177。本系統(tǒng)具有交流電壓測量和交流電壓輸出兩大 功能。通過調試與測量完成了題目的基本部分和全部發(fā)揮部分的要求并有 自己的創(chuàng)新。 參考文獻 ................................................................. 23 濰坊學院?？飘厴I(yè)設計（論文） I 簡易數(shù)字交流毫伏表設計 摘要 本系統(tǒng)分電壓測量和信號產生輸出兩大部分，電壓測量部分以模擬電路為主，配合放大模塊、 A/D轉化模塊、顯示模塊；通過凌陽單片機進行數(shù)據處理，在誤差允許范圍內顯示測量電壓值。濰坊學院?？飘厴I(yè)設計（論文） I 目錄 摘要 ...................................................................... I Abstract ................................................. 錯誤 !未定義書簽。 第一章 引言 .............................................................. 1 第二章 系統(tǒng)設計思想 ...................................................... 2 測量方案 .......................................................... 2 輸出部分中各模塊的方案選擇 ...................................... 2 最終整體方案設計 ................................................. 2 總體設計方案 ..................................................... 3 第三章 系統(tǒng)的硬件設計 .................................................... 5 系統(tǒng)硬件的主要組成部分與理論分析計 算 ........................... 5 系統(tǒng)硬件部分 ................................................ 5 理論分析與公式計算 ......................................... 5 系統(tǒng)各模塊單元的理論分析與實際電路設計 ......................... 5 測量部分 .................................................... 5 輸出部分 .................................................... 8 毫伏表的基本電路部分 ...................................... 14 穩(wěn)壓電源部分電路設計 ...................................... 14 第四章 系統(tǒng)的軟件設計 ................................................... 16 主流程圖 ......................................................... 16 濰坊學院?？飘厴I(yè)設計（論文） II 軟件子流程圖 ..................................................... 17 測量部分 ................................................... 17 輸出部分軟件流程圖 ........................................ 18 第五章 調試（系統(tǒng)測試）過程 ............................................ 19 測試儀器與設備 ................................................... 19 測試過程 ......................................................... 19 分模塊調試： ............................................... 19 整機系統(tǒng)調試： ............................................. 19 結果分析 ......................................................... 19 總結 ..................................................................... 21 結束語 ................................................... 錯誤 !未定義書簽。信號產生以 直接數(shù)字式頻率合成器 (Direct Digital Frequ