【作者】 张广军； 李铭祥；

【Author】 ZHANG Guang-jun LI Ming-xiang School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China

【机构】 上海大学通信与信息工程学院；

【摘要】 移动通信系统对线性功率放大器的要求越来越高。本文分析并设计了一应用在UMTS频段(2.11~2.17GHz)的低噪声高线性放大器,用来放大WCDMA前馈线性功放中的失真信号。采用负反馈技术使最小噪声性能和输入输出匹配同时实现,达到较小的输入输出驻波比,并应用低频低阻抗偏置终端来提高IIP3, 减小放大器的互调失真,两种技术的适当结合来满足前馈功放系统的要求。更多还原

【Abstract】 The linear power amplifier plays a more and more important role in mobile system. In this paper, a low noise high linearity amplifier which works in UMTS frequencies is analyzed and designed, it is used to amplify the distorted signal in WCDMA feed-forward linear power amplifier system. Negative feedback technology is applied to make the optimum noise character and the matching of input and output ports appear simultaneously, so to attain less input and output VSWRs. Low impedance bias termination is used for IIP3 enhancement, to reduce the intermodulation distortion. The proper combination of the two technologies can satisfy the system of feed-forward linear power amplifier.更多还原