本文選題：寬帶射頻前端 + VHF　； 參考：《電子科技大學》2015年碩士論文

【摘要】：當今,無線通信系統(tǒng)朝著低功耗、小型化、多功能方向飛速發(fā)展,射頻前端作為連接廣闊自由空間和基帶信號處理之間的橋梁,對其的設計指標要求也越來越高,不僅要求其具有高動態(tài)范圍及高靈敏度等特點,而且要求其具有更寬的帶寬。鑒于此,本論文密切結合項目研究課題,對無線通信系統(tǒng)射頻前端電路模塊的寬帶化處理方案進行了深入的研究,并在此基礎上完成VHF頻段通信機寬帶射頻前端系統(tǒng)的研制任務,論文的內容主要包括以下幾個方面:1、結合VHF無線信道對射頻前端系統(tǒng)參數(shù)進行了設計。介紹了VHF無線信道干擾理論,對干擾信號的來源及分類進行了簡單的闡述,從理論上分析了其對有用信號的影響,在此基礎上簡單地介紹了對射頻端對干擾信號的抑制措施,最后,對收發(fā)信機系統(tǒng)相關參數(shù)進行了簡單介紹,基于實測信道環(huán)境完成VHF頻段通信機射頻前端系統(tǒng)的參數(shù)設計。2、介紹了寬帶射頻前端主要結構,確定VHF頻段寬帶通信機射頻前端系統(tǒng)設計方案,對系統(tǒng)設計步驟進行了簡單介紹,基于成本和小型化要求完成收發(fā)系統(tǒng)模塊指標的分配和芯片的選型,運用ADS仿真軟件分別對收發(fā)信機射頻前端系統(tǒng)性能進行驗證,驗證結果基本滿足要求。3、介紹了PLL鎖相環(huán)路工作的基本原理,推導鎖相環(huán)路中各個模塊的相位噪聲對其合成信號相噪的影響,在此基礎上,基于CG38完成壓控振蕩器的設計,基于MC145193完成寬帶射頻前端系統(tǒng)鎖相環(huán)本振源的設計,測試結果顯示,本振源的雜散得到了很好的抑制,相位噪聲也滿足設計要求,與此同時,在介紹一段短傳輸線等效模型的基礎上完成等功率分配器的方案設計。4、對射頻前端放大器的寬帶化處理方案進行了論述,在基礎上完成低噪聲放大器、功率放大器電路的設計,同時對寬帶射頻前端濾波器(包括帶通濾波器與低通濾波器)、基帶I/Q匹配電路、基帶I/Q偏置電路、零中頻抗直流偏移、DC-DC變換電源及調制解調器等模塊電路進行了方案的設計與調試,完成整個VHF頻段寬帶通信機射頻前端系統(tǒng)的設計與調試,測試結果顯示,所有指標都基本達到了系統(tǒng)設計要求。
[Abstract]:Nowadays, wireless communication system is developing rapidly in the direction of low power consumption, miniaturization and multifunction. As a bridge between wide free space and baseband signal processing, RF front-end is required more and more. It is required not only to have high dynamic range and high sensitivity, but also to have wider bandwidth. In view of this, this paper closely combines the project research topic, carries on the thorough research to the wireless communication system RF front-end circuit module wideband processing scheme. On this basis, the research task of broadband RF front-end system of VHF band communication machine is completed. The main contents of this paper include the following aspects: 1. The parameters of RF front-end system are designed based on VHF wireless channel. In this paper, the theory of VHF radio channel interference is introduced, and the source and classification of interference signal are briefly described. The influence of interference signal on useful signal is analyzed theoretically. On the basis of this, the measures of suppressing interference signal at RF terminal are briefly introduced. Finally, the related parameters of transceiver system are briefly introduced. The design of RF front-end system of VHF frequency band communication machine is completed based on the measured channel environment. The main structure of broadband RF front-end is introduced. The design scheme of RF front-end system of VHF broadband communication machine is determined. The design steps of the system are simply introduced. Based on the cost and miniaturization requirements, the allocation of the module index and the selection of the chip are completed. The performance of RF front-end system of transceiver is verified by using ADS simulation software, and the verification results basically meet the requirement of .3.The basic principle of PLL phase-locked loop is introduced. The effect of the phase noise of each module in the PLL on the phase noise of the synthesized signal is deduced. On this basis, the design of the VCO based on CG38 and the design of the local oscillator of the phase-locked loop (PLL) of the wide-band RF front-end system based on MC145193 are completed. The test results show that the stray of the local oscillator is well suppressed, and the phase noise can meet the design requirements, at the same time, On the basis of introducing the equivalent model of a short transmission line, the scheme design of equal power divider is completed. The broadband processing scheme of RF front-end amplifier is discussed. On the basis of this, the low noise amplifier and power amplifier circuit are designed. At the same time, wideband RF front-end filters (including band-pass filters and low-pass filters, baseband I / Q matching circuits, baseband I / Q bias circuits, The design and debugging of the zero-intermediate frequency anti-DC offset DC-DC converter power supply and modem are carried out. The design and debugging of the RF front-end system of the whole VHF broadband communication machine are completed. The test results show that, All the indexes basically meet the system design requirements.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN92

【參考文獻】

相關碩士學位論文 前1條

1 馮立松;UWB系統(tǒng)零中頻超寬帶接收機設計[D];中國科學技術大學;2010年

，

本文編號：1824528