【正文】 , binary frequency shift keying (2FSK), binary phase shift keying (2PSK) and differential binary phase shift key Control (2DPSK) and other basic types, the main subject of the digital frequency modulation, also known as frequency shift keying (FSK). PROTEL software while taking advantage of the simulation of the FSK system, which through the use of visual simulation to demodulate modulation means to achieve the purpose.Key words: Digital munication,FSK signal,protel simulation 黃 河 科 技 學(xué) 院 畢 業(yè) 設(shè) 計 說 明 書 第 III 頁 目 錄1 緒 論...........................................................................................................................1 課題背景及目的 ..............................................................................................1 國內(nèi)外研究狀況 .............................................................................................1 課題研究方法 .................................................................................................2 論文構(gòu)成及研究內(nèi)容 ......................................................................................22 FSK 調(diào)制器的技術(shù)分析 ............................................................................................3 2FSK 信號的時域表達(dá)式 .............................................................................3 2FSK 信號的波形 .............................................................................3 2FSK 信號的功率譜密度 ....................................................................4 FSK 調(diào)制器的模型分析 ...............................................................................4 2FSK 調(diào)制系統(tǒng)設(shè)計 ............................................................................4 偽隨機序列產(chǎn)生原理及作用 ...............................................................5 M 序列的性質(zhì) ......................................................................................7 FSK 信號的解調(diào) ..............................................................................................8 包絡(luò)檢波法 ..........................................................................................8 相干檢測法 ..........................................................................................9 過零檢測法 ..........................................................................................9 差分檢測法 ........................................................................................103 PROTEL99 軟件的簡要介紹 ...............................................................................11 PROTEL 99SE 軟件的組成和特點 ..............................................................11 PROTEL 99SE 軟件的組成 ...............................................................11 PROTEL 99SE 軟件的主要特點 .......................................................12 PROTEL 99SE 軟件在仿真方面的特點 ......................................................12 用 PROTEL 99SE 軟件進(jìn)行電路設(shè)計的基本步驟 .....................................134 FSK 調(diào)制器的電路設(shè)計與分析 ..............................................................................16 計算模型及主要分析思路 ...........................................................................16黃 河 科 技 學(xué) 院 畢 業(yè) 設(shè) 計 說 明 書 第 IV 頁 方波產(chǎn)生電路方案論證 .....................................................................16 方案比較 ............................................................................................16 分頻器電路設(shè)計 ...........................................................................................18 M 序列發(fā)生器電路設(shè)計 ...............................................................................18 調(diào)制器電路設(shè)計 ............................................................................................19 2FSK 調(diào)制系統(tǒng)總電路原理圖 ......................................................................19 基于 PROTEL99 平臺的仿真 ..........................................................................20 PCB 板的制作 .............................................................................................21總 結(jié)............................................................................................................................22致 謝............................................................................................................................23參考文獻(xiàn).............