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面包屑導航結束 --> <!-- 頁面標題開始 --> <div id="n1l1njb9b" class="title"> <h3><a>論關于ICL8038函數信號發生器的設計及原理圖<small></small></a></h3> </div> <!-- 頁面標題結束 --> <hr class="featurette-divider"> <!-- 中部開始 --> <div id="n1l1njb9b" class="container"> <!-- 正文 --> <div id="n1l1njb9b" class="lead" id="print"> <p> <span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">本設計是以</span><span lang="EN-US" style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> ICL8038 </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">和</span><span lang="EN-US" style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> AT89C2051 </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">為中心規劃的數控及掃頻函數信號發生器。</span><span lang="EN-US" style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> ICL8038 </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">作為函數信號源聯系外圍電路發生占空比和起伏可調的正弦波、</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">方波、三</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">角</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">波</span><span lang="EN-US" style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> ; </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">該</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">函</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">數</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">信</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">號</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">發</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">生</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">器</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">的</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">頻</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">率</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">可</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">調</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">范</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">圍</span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">為</span><span lang="EN-US" style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;">1~100kHz, </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">步進為</span><span lang="EN-US" style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;"> 0.1kHz, </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">波形安穩</span><span lang="EN-US" style="line-height: 13.5pt; text-indent: 21pt; font-family: Tahoma;">, </span><span style="line-height: 13.5pt; text-indent: 21pt; font-family: 宋體;">無顯著失真。</span></p> <p class="MsoNormal" align="left" style="margin: 3.75pt 0cm 3.75pt 18pt; text-indent: 21pt; line-height: 13.5pt;"><span lang="EN-US" style="font-family: Tahoma;">1. </span><span style="font-family: 宋體;">體系設計框圖</span><span lang="EN-US" style="font-family: Tahoma;"><o:p></o:p></span></p> <p class="MsoNormal" align="left" style="margin: 3.75pt 0cm; text-indent: 21pt; line-height: 13.5pt;"><span style="font-family: 宋體;">如圖</span><span lang="EN-US" style="font-family: Tahoma;"> 1 </span><span style="font-family: 宋體;">為體系規劃框圖。本規劃是利用鍵盤設置相應的頻率值</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">依據所設置頻率段挑選相應電容</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">經核算取得相應數字量送數字電位器完成</span><span lang="EN-US" style="font-family: Tahoma;"> D/A</span><span style="font-family: 宋體;">變換</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">一起與參閱電壓</span><span lang="EN-US" style="font-family: Tahoma;"> (</span><span style="font-family: 宋體;">本例為</span><span lang="EN-US" style="font-family: Tahoma;"> 5.5V) </span><span style="font-family: 宋體;">相加后構成數控調壓去操控</span><span lang="EN-US" style="font-family: Tahoma;">ICL8038 </span><span style="font-family: 宋體;">第</span><span lang="EN-US" style="font-family: Tahoma;"> 8 </span><span style="font-family: 宋體;">腳</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">這樣即可由</span><span lang="EN-US" style="font-family: Tahoma;"> ICL8038 </span><span style="font-family: 宋體;">完成對應頻率值的矩形波、</span><span style="font-family: Tahoma;"> </span><span style="font-family: 宋體;">三角波和正弦波。方波起伏經衰減后送單片機可測得信號源頻率并由數碼管顯現。</span><span lang="EN-US" style="font-family: Tahoma;"><o:p></o:p></span></p> <p class="MsoNormal" align="left" style="margin: 3.75pt 0cm; text-indent: 21pt; line-height: 13.5pt;"><span lang="EN-US" style="font-family: Tahoma;">2.</span><span style="font-family: 宋體;">電路原理圖</span><span lang="EN-US" style="font-family: Tahoma;"><o:p></o:p></span></p> <p class="MsoNormal" align="left" style="margin: 3.75pt 0cm; text-indent: 21pt; line-height: 13.5pt;"><span style="font-family: 宋體;">圖</span><span lang="EN-US" style="font-family: Tahoma;"> 2 </span><span style="font-family: 宋體;">為電路原理圖。其間</span><span lang="EN-US" style="font-family: Tahoma;"> AT89C2051 </span><span style="font-family: 宋體;">是</span><span lang="EN-US" style="font-family: Tahoma;"> 8 </span><span style="font-family: 宋體;">位單片機</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">其間</span><span lang="EN-US" style="font-family: Tahoma;">: P1.4~P1.7</span><span style="font-family: 宋體;">、</span><span lang="EN-US" style="font-family: Tahoma;"> P1.2</span><span style="font-family: 宋體;">、</span><span lang="EN-US" style="font-family: Tahoma;"> P1.3</span><span style="font-family: 宋體;">、</span><span lang="EN-US" style="font-family: Tahoma;"> P3.0</span><span style="font-family: 宋體;">、</span><span lang="EN-US" style="font-family: Tahoma;"> P3.1 </span><span style="font-family: 宋體;">作為數碼顯現</span><span lang="EN-US" style="font-family: Tahoma;">; P3.3</span><span style="font-family: 宋體;">、</span><span lang="EN-US" style="font-family: Tahoma;"> P3.5 </span><span style="font-family: 宋體;">、</span><span lang="EN-US" style="font-family: Tahoma;"> P3.7 </span><span style="font-family: 宋體;">作為鍵盤輸入口</span><span lang="EN-US" style="font-family: Tahoma;">; P3.4 </span><span style="font-family: 宋體;">作</span><span lang="EN-US" style="font-family: Tahoma;"><o:p></o:p></span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US"><img src="/upload/images/201407/14067882260284.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><img src="/upload/images/201407/14067882381196.jpg" alt="" /></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">為計數口</span><span lang="EN-US">, </span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">用于測量信號源頻率</span><span lang="EN-US">;P3.0~P3.2 </span><span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">作為數字電位器的</span><span lang="EN-US">SPI</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">總線</span><span lang="EN-US">; P1.1</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">、</span><span lang="EN-US"> P1.0 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">可根據需要擴展繼電器或模擬開關選擇</span><span lang="EN-US"> ICL8038</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">第</span><span lang="EN-US"> 10</span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">腳</span><span lang="EN-US"> ( CAP )</span><span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">與第</span><span lang="EN-US">11</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">腳間的電容</span><span lang="EN-US">C</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">。</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">MCP41010 </span><span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">是</span><span lang="EN-US"> 8 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">位字長的數字電位器</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">采用三總線</span><span lang="EN-US"> SPI </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">接口。</span><span lang="EN-US">/CS: </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">片選信號</span><span lang="EN-US">, </span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">低電平有效</span><span lang="EN-US">; SCK:</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">時鐘信號輸入端</span><span lang="EN-US">; SI: </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">串行數據輸入端</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">用于寄存器的選擇及數據輸入。</span><span lang="EN-US">MCP41010 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">可作為數字電位器</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">也可以作為</span><span lang="EN-US"> D/A</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">轉換器</span><span lang="EN-US">, </span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">本設計是將</span><span lang="EN-US"> MCP41010 </span><span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">接成</span><span lang="EN-US"> 8 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">位字長的</span><span lang="EN-US"> D/A</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">轉換器</span><span lang="EN-US">, MCP41010 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">根據輸入的串行數據</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">對基準電壓進行分壓后由中間抽頭輸出模擬電壓</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">即</span><img src="/upload/images/201407/14067883366969.jpg" alt="" /></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">( </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">式</span> <span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">中</span><img src="/upload/images/201407/14067883471716.jpg" alt="" /></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">)</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">函數發生電路</span><span lang="EN-US"> ICL8038, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">圖</span><span lang="EN-US"> 2</span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">所示是一個占空比和一個頻率連續可調的函數發生電路。</span><span lang="EN-US">ICL8038</span><span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">是一種函數發生器集成塊</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">通過外圍電路的設計</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">可以產生高精密度的正弦波、方波、三角波信號</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">選擇不同參數的外電阻和電容</span> <span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">等</span> <span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">器</span> <span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">件</span><span lang="EN-US"> , </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">可</span> <span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">以</span> <span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">獲</span> <span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">得</span> <span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">頻</span> <span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">率</span> <span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">在</span><span lang="EN-US">0.01Hz~300kHz</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">范圍內的信號。通過調節</span><span lang="EN-US"> RW2 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">可使占空比在</span><span lang="EN-US"> 2%~98%</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">可調。第</span><span lang="EN-US"> 10 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">腳</span><span lang="EN-US">( CAP) </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">與第</span><span lang="EN-US">11 </span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">腳間的電容</span><span lang="EN-US"> C</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">起到很重要的作用</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">它的大小決定了輸出信號頻率的大小</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">當</span><span lang="EN-US"> C </span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">確定后</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">調節</span><span lang="EN-US">ICL8038 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">第</span><span lang="EN-US"> 8 </span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">腳的電壓可改變信號源的輸出頻率。從</span><span lang="EN-US"> ICL8038 </span><span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">引腳</span><span lang="EN-US"> 9(</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">要接上拉電阻</span><span lang="EN-US">)</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">輸出的波形經衰減后送單片機</span><span lang="EN-US">P3.4</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">進行頻率測量。</span></p> <p class="MsoNormal" align="left" style="margin: 3.75pt 0cm; text-indent: 21pt; line-height: 13.5pt;"><span style="font-family: 宋體;">正弦函數信號由三角波函數信號經過非線性改換而取得。利用二極管的非線性特性</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">能夠將三角波信號的上升和降低斜率逐次迫臨正弦波的斜率。</span><span lang="EN-US" style="font-family: Tahoma;"> ICL8038 </span><span style="font-family: 宋體;">中的非線性網絡是由</span><span lang="EN-US" style="font-family: Tahoma;"> 4 </span><span style="font-family: 宋體;">級擊穿點的非線性迫臨網絡構成。一般說來</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">迫臨點越多得到的正弦波作用越好</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">失真度也越小</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">在本芯片中</span><span lang="EN-US" style="font-family: Tahoma;"> N= 4, </span><span style="font-family: 宋體;">失真度能夠小于</span><span lang="EN-US" style="font-family: Tahoma;"> 1</span><span style="font-family: 宋體;">。在實測中得到正弦信號的失真度可達</span><span lang="EN-US" style="font-family: Tahoma;"> 0.5 </span><span style="font-family: 宋體;">左右。其精度作用適當滿足。為了進一步減小正弦波的失真度</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">可選用圖</span><span lang="EN-US" style="font-family: Tahoma;"> 2 </span><span style="font-family: 宋體;">所示電路中兩個電位器</span><span lang="EN-US" style="font-family: Tahoma;"> RW3 </span><span style="font-family: 宋體;">和</span><span lang="EN-US" style="font-family: Tahoma;"> RW4 </span><span style="font-family: 宋體;">所構成的電路</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">調整它們可使正弦波失真度減小。當然</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">假如矩形波的占空比不是</span><span lang="EN-US" style="font-family: Tahoma;"> 50% , </span><span style="font-family: 宋體;">矩形波不再是方波</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">引腳</span><span lang="EN-US" style="font-family: Tahoma;"> 2 </span><span style="font-family: 宋體;">輸出也就不再是正弦波了。</span><span lang="EN-US" style="font-family: Tahoma;"><o:p></o:p></span></p> <p class="MsoNormal" align="left" style="margin: 3.75pt 0cm; text-indent: 21pt; line-height: 13.5pt;"><span style="font-family: 宋體;">經試驗發現</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">在電路設計中接</span><span lang="EN-US" style="font-family: Tahoma;"> 10 </span><span style="font-family: 宋體;">腳和</span><span lang="EN-US" style="font-family: Tahoma;"> 11 </span><span style="font-family: 宋體;">腳的電容值和功能是全部電路的要害器材</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">電容值的斷定也就斷定電路能發生的頻率規模</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">電容功能的好壞直接影響信號頻率的安穩性、波形的失真度</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">因為該芯片是經過恒流源對</span><span lang="EN-US" style="font-family: Tahoma;"> C</span><span style="font-family: 宋體;">充放電來發生振動的</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">故振動頻率的安穩性就遭到外接電容及恒流源電流的影響</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">若要使輸出頻率安穩</span><span lang="EN-US" style="font-family: Tahoma;">, </span><span style="font-family: 宋體;">有必要選用以下措施</span><span lang="EN-US" style="font-family: Tahoma;">:</span><span style="font-family: 宋體;">外接電阻、電容的溫度特性要好</span><span lang="EN-US" style="font-family: Tahoma;">; </span><span style="font-family: 宋體;">外部電源應安穩</span><span lang="EN-US" style="font-family: Tahoma;">; </span><span style="font-family: 宋體;">電容應選用漏電小、質量好的非極化電容器。</span><span lang="EN-US" style="font-family: Tahoma;"><o:p></o:p></span></p> <p class="MsoNormal" style="margin-left:18.0pt;text-indent:21.0pt;mso-char-indent-count: 2.0;mso-list:l0 level1 lfo1;tab-stops:list 18.0pt"><!--[if !supportLists]--><span lang="EN-US">1.<span style="font-size: 7pt; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">實驗結果</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US"><img src="/upload/images/201407/14067882502298.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">4.</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">軟件流程圖</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">圖</span><span lang="EN-US"> 3 </span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">為軟件流程圖。</span><span lang="EN-US">T0 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">設為計數器</span><span lang="EN-US">,T1 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">設為定時器</span><span lang="EN-US">(</span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">初值為</span><span lang="EN-US"> 5ms)</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">。</span><span lang="EN-US">5ms </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">啟動主循環</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">主要用于鍵盤掃描及掃描顯示</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">圖</span><span lang="EN-US"> 2 </span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">中</span><span lang="EN-US"> K0 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">作為控制鍵</span><span lang="EN-US">, K1 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">作為調整鍵</span><span lang="EN-US">, K2 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">作為增加鍵</span><span lang="EN-US">; </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">上電時程序進入頻率設置模式</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">按一下</span><span lang="EN-US"> K0 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">鍵程序進入數控模式</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">按二下</span><span lang="EN-US"> K0 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">鍵程序進入掃頻模式</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">按三下</span><span lang="EN-US"> K0 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">鍵程序進入頻率設置模式</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">周而復始。在頻率設置模式</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">由</span><span lang="EN-US"> K1 </span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">鍵和</span><span lang="EN-US"> K2 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">鍵完成頻率設置。</span></p> <p><span lang="EN-US" style="font-size:10.5pt;mso-bidi-font-size:10.0pt;font-family: "Times New Roman";mso-fareast-font-family:宋體;mso-font-kerning:1.0pt;mso-ansi-language: EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA"><img src="/upload/images/201407/14067882704579.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal" align="center" style="margin-top:4.5pt;margin-right:0cm; margin-bottom:7.5pt;margin-left:0cm;text-align:center;line-height:13.5pt; 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background-position: initial; background-repeat: initial;">伯特利數控一直以盡心、盡力、盡意的態度把握每一臺</span><b><span style="font-family: Arial; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> </span></b><b><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;font-family:宋體;mso-bidi-font-family:宋體;mso-font-kerning:0pt"><a ><span lang="EN-US">加工中心</span></a></span></b><b><span style="font-family: 宋體; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;">、</span></b><b><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;font-family:宋體;mso-bidi-font-family:宋體;mso-font-kerning:0pt"><a ><span lang="EN-US">鉆攻中心</span></a></span></b><span style="font-family: 宋體; background-image: initial; background-attachment: initial; 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