基于第三代移动通信的高效率线性功放的研制电路与系统专业论文.docxVIP

优秀毕业论文 精品参考文献资料 AbstractWCDMA Abstract WCDMA is one of four the whole world 3G standards that International Telecommunication Union approves．WCDMA relies on its bigger system capacity， more excellent implication mass，hi出er frequency spectrum efficiency，quicker data rate，stronger anti—fading ability,much better resisting．It will become the best mutipleaccess scheme of IMT·2000／I刀MTS．The linearity requirement of the base station power amplifier becomes tighter because of spectrum emission．On consider of the cost and rejection of heat of base station,the efficiency is also a critical factor when linearity is enough． TIlis paper firstly analyses the urdmeadty characteristic of power amplifier and linear technologys especial feedforward technique in theory．At the salIle time,it introduces a novelty feedforward technology which well make up the lower efficiency of traditional feedforward technology．According to the RF specifications in 3GPP for WCDMA transmitter power amplifier,all adaptive feedforward amplifier system is completed including EDA simulation,circuits layout and main mechanical structure design． Test results show that under 2-tone test in 5MHz tone spacing,the power amplifier system achieves near upon一50dBc．Though there is a tittle worse in linearity of the feedforward system,it theoretically satisfies the 3GPP requirement for WCDMA base-station transistor．The efficiency of the whole feedforward system is quite improved compared to that of traditional fceAfarward system． Keywords：power amplifier,linearity technique，feedforward，IMD3，adaptive control II 独创性声明本人声明所呈交的学位论文是本人在导师指导下进行的研究工 独创性声明 本人声明所呈交的学位论文是本人在导师指导下进行的研究工 作及取得的研究成果。据我所知，除了文中特别加以标注和致谢的地 方外，论文中不包含其他人已经发表或撰写过的研究成果，也不包含 为获得电子科技大学或其它教育机构的学位或证书而使用过的材料。 与我一同工作的同志对本研究所做的任何贡献均已在论文中作了明 确的说明并表示谢意。 签名：—— 日期： 年 月 日 关于论文使用授权的说明 本学位论文作者完全了解电子科技大学有关保留、使用学位论文 的规定，有权保留并向国家有关部门或机构送交论文的复印件和磁 盘，允许论文被查阅和借阅。本人授权电子科技大学可以将学位论文 的全部或部分内容编入有关数据库进行检索，可以采用影印、缩印或 扫描等复制手段保存、汇编学位论文。 (必威体育官网网址的学位论文在解密后应遵守此规定) 签名：—— 导师签名： 日期： 年 月 日