射频模拟预失真器的研究与设计  

Research and Design of Analog RF Predistortor

作　　者：向永波[1] 王光明[1] 

机构地区：[1]空军工程大学,陕西三原713800

出　　处：《半导体技术》2009年第11期1148-1151,共4页Semiconductor Technology

摘　　要：利用小信号BJT放大器的非线性特性设计了一个有源模拟预失真器。通过调整小信号放大器的偏置状态和对失真信号的提取控制,使功放的三阶互调失真得到了明显的改善。双音实测数据表明,该预失真器使一个GSM基站功放在5 dB功率回退点附近的三阶互调失真改善了18 dB左右,与传统的射频预失真器相比,该预失真器对功放三阶互调失真的改善度提高了10 dB左右。An analog active predictortor was designed using the non-linear characteristic of a small signal BJT amplifier.The IMD3 performance of a power amplifier was greatly improved by tuning the bias of the small signal amplifier along with distilling and controlling the distorted signal.Two-tone test shows the IMD3 performance of a GSM base station power amplifier is improved around 18 dB after 5 dB back-off power point.It has a 10 dB enhancement of the IMD3 performance compared with traditional RF predistortors.

关 键 词：有源预失真 射频 三阶互调 功放 

分 类 号：TN406[电子电信—微电子学与固体电子学]