無(wú)線通信論文：無(wú)線通信 功率放大器 晶體振蕩器

1、 無(wú)線通信論文：無(wú)線通信 功率放大器 晶體振蕩器【中文摘要】無(wú)線通信是利用電磁波信號(hào)可以在自由空間傳播的特性進(jìn)行信息交換的一種通信方式。近些年無(wú)線通信技術(shù)的發(fā)展,給人們之間的通信帶來(lái)很大的方便,應(yīng)用也越來(lái)越廣泛。本論文主要對(duì)高頻段的無(wú)線收發(fā)電路進(jìn)行研究,文中給出了此設(shè)計(jì)的過(guò)程及最終的實(shí)現(xiàn)電路,并詳細(xì)分析了電路的工作原理。首先本文分別對(duì)調(diào)制解調(diào)器、功率放大器、晶體振蕩器、混頻器和檢波器等進(jìn)行理論分析,根據(jù)原理的分析結(jié)果設(shè)計(jì)出各個(gè)模塊的相應(yīng)電路。然后采用PSPICE對(duì)電路進(jìn)行仿真,根據(jù)仿真結(jié)果對(duì)電路進(jìn)行優(yōu)化,使電路工作在最佳的狀態(tài)。最后根據(jù)理論分析的結(jié)果和設(shè)計(jì)的原理圖,進(jìn)行無(wú)線收發(fā)電路的構(gòu)建。調(diào)制

2、電路采用了ASK調(diào)制方式,電路由高速CMOS門電路來(lái)實(shí)現(xiàn)。本地信號(hào)源一個(gè)CMOS皮爾斯振蕩器,此振蕩電路簡(jiǎn)單、性能穩(wěn)定、電流驅(qū)動(dòng)能力強(qiáng),能夠很好的滿足本設(shè)計(jì)的要求。功率放大器采用的是高效率的C類功率放大器,后級(jí)是一個(gè)巴特沃斯型低通濾波器,濾波后通過(guò)匹配電路和天線連接,最后經(jīng)過(guò)天線發(fā)射調(diào)制信號(hào)。接收電路的前級(jí)功放是由MC1350構(gòu)成,放大后的信號(hào)經(jīng)本地振蕩電路進(jìn)行混頻,輸出的中頻信號(hào)經(jīng)過(guò)檢波電路進(jìn)行檢波,檢波后通過(guò)電壓比較器把模擬信號(hào)轉(zhuǎn)換為數(shù)字信號(hào),至此完成了信號(hào)的解調(diào)。本論文根據(jù)設(shè)計(jì)的實(shí)際電路進(jìn)行了測(cè)試,能夠滿足本設(shè)計(jì)的指標(biāo)要求。此電路思路明確,結(jié)構(gòu)簡(jiǎn)單,易于實(shí)現(xiàn),有一定的實(shí)用價(jià)值?！居⑽恼?/p>

3、】Wireless communication is a kind of communication manner which can exchange information using electromagnetic waves that propagate in free space. In recent years, the development of the wireless communication technology has made the correspondence among people become more convenient, and its applic

4、ation is more and more widely.In this thesis, a study is performed about the High frequency wireless transceiver, has produced this design detailed process and the final realization electric circuit, and the electric circuit principle of work is deeply studied. First of all, this paper gives a theor

5、etical analysis of the modem, power amplifier, crystal oscillator, mixers and detectors and designs the corresponding circuit of each module based on the results of analysis of principles. Then PSPICE is used to simulate the circuit to optimize the circuit, according to the results of simulation mak

6、e the circuit work in the best condition. Finally, a hardware circuit is fabricated by the results of theoretical analysis and designed schematics.The theory of ASK is used in the modulation system, and the circuit is realized by the high speed CMOS gate. A CMOS Pierce oscillator circuit is used for

7、 its excellent frequency stability, simple design, and high drive level, which meets the requirements of design. A high efficiency Class C amplifier is used in design. The latter class is a Butterworth low-pass filter which connects the antenna through the matching circuit after filtering and finall

8、y launches through the antenna. PREAMP is constituted by MC1350 and the amplified signal is mixed by the local oscillator circuit. The output of the IF signal is detected through the detector circuit and then transform the imitative signals into digital signals through a voltage comparator after det

9、ecting, thus completed the signal demodulation.The designed electric circuit is tested, and the result can satisfy the design specification. This electric circuit mentality is clear, simple, easy to realize also has a certain useful value.【關(guān)鍵詞】無(wú)線通信 功率放大器 晶體振蕩器 濾波器 PSPICE【英文關(guān)鍵詞】Wireless Communication

10、 Amplifier Crystal Oscillator Filter PSPICE【目錄】高頻無(wú)線收發(fā)電路的研究與設(shè)計(jì) 摘要 4-5 Abstract 5 第1章 緒論 10-13 1.1. 無(wú)線收發(fā)電路的概念 10 1.2. 課題的研究意義 10-121.2.1. 無(wú)線電傳輸?shù)陌l(fā)展歷史 10-111.2.2. 無(wú)線電的應(yīng)用 111.2.3. 無(wú)線通信中收發(fā)電路的研究意義 11-12 1.3. 論文章節(jié)安排 12-13 第2章 無(wú)線收發(fā)電路的基本組成及其工作原理 13-20 2.1. 通信系統(tǒng)的基本結(jié)構(gòu) 13-142.1.1 通信系統(tǒng)的結(jié)構(gòu)框圖 13 2.1.2 無(wú)線通信的分類 13-14

11、 2.2. 無(wú)線收發(fā)電路的調(diào)制與解調(diào) 14-16 2.2.1 調(diào)制與解調(diào)的基本概念 14-15 2.2.2 本設(shè)計(jì)的調(diào)制與解調(diào) 15-16 2.3. 無(wú)線收發(fā)電路的基本組成 16-20 2.3.1. 無(wú)線發(fā)射電路的結(jié)構(gòu) 16-172.3.2. 無(wú)線接收電路的基本結(jié)構(gòu)及其原理 17-20 第3章 無(wú)線發(fā)射電路的設(shè)計(jì) 20-46 3.1. 功率放大器的設(shè)計(jì) 20-253.1.1 功率放大器基礎(chǔ) 20-21 3.1.2 功率放大器的主要技術(shù)指標(biāo) 21 3.1.3 影響放大器輸出功率的主要因素 21-22 3.1.4 提高放大器輸出功率的方法 22 3.1.5 工作狀態(tài)的選擇問(wèn)題 22-23 3.1.

12、6 類放大器的工作原理 23-24 3.1.7 小功率放大器的設(shè)計(jì) 24-25 3.2. 濾波電路的設(shè)計(jì) 25-28 3.2.1. 濾波器的基本概念 25-263.2.2. 巴特沃斯型低通濾波器的介紹 26-273.2.3. 巴特沃斯型低通濾波器歸一化的設(shè)計(jì)方法 273.2.4. 巴特沃斯型低通濾波器歸一化的設(shè)計(jì)步驟 27-28 3.3. 振蕩器的設(shè)計(jì) 28-433.3.1. 放大器和振蕩器的關(guān)系 29-303.3.2. 震蕩的建立與穩(wěn)定 30-313.3.3. 振幅平衡條件和相位平衡條件 31-323.3.4. 振蕩器的基本分析方法 32-343.3.5. LC正弦波振蕩器 34-353.3

13、.5.1. LC三點(diǎn)式振蕩器相位平衡條件的判斷 34-353.3.6. 電容式三點(diǎn)式振蕩器 35-373.3.7. 石英晶體振蕩器 37-433.3.7.1. 石英晶體上的標(biāo)稱的頻率和實(shí)際的振蕩頻率 393.3.7.2. 一個(gè)并聯(lián)晶體振蕩器的設(shè)計(jì) 39-403.3.7.3. 一種用CMOS倒相器構(gòu)成的簡(jiǎn)易的振蕩器 40-423.3.7.4. 反相器74HCU04與74HC04在晶體振蕩器中的微小差別 423.3.7.5. CL1和CL2電容的設(shè)置 423.3.7.6. 反相器晶體振蕩的頻率 423.3.7.7. 振蕩頻率微調(diào)的方法 42-43 3.4. 調(diào)制電路設(shè)計(jì) 43-46 第4章 無(wú)線接

14、收電路設(shè)計(jì) 46-58 4.1. 接收機(jī)的主要功能規(guī)格 46-474.1.1. 靈敏度 464.1.2. 噪聲因素與噪聲度 46-474.1.3. 選擇性 474.1.4. 動(dòng)態(tài)范圍 47 4.2. 接收電路高頻放大器的設(shè)計(jì) 47-50 4.3. 混頻電路設(shè)計(jì) 50-584.3.1. 混頻器的原理 50-514.3.2. 混頻器的設(shè)計(jì) 51-524.3.3. 檢波電路和模數(shù)轉(zhuǎn)變電路的設(shè)計(jì) 52-564.3.3.1. 二極管檢波的工作原理 534.3.3.2. 二極管大信號(hào)檢波的主要參數(shù) 53-554.3.3.3. 檢波器參數(shù)的選擇 554.3.3.4. 檢波器的設(shè)計(jì) 55-564.3.4. 模數(shù)轉(zhuǎn)換