射频功率放大器前馈线性化技术研究  

Study of Feedforward Linearization Technology for RF Power Amplifier

作　　者：丘春辉[1] 陈向东[1] 沈冰[1] 

机构地区：[1]西南交通大学信息科学与技术学院,四川成都610031

出　　处：《微电子学与计算机》2008年第11期133-136,共4页Microelectronics & Computer

基　　金：国家自然科学基金项目(60572026);四川省学术与技术带头人培养基金重点项目(Q024131103010018);西南交通大学科技发展基金项目(2006A05)

摘　　要：首先提出主放大器的反射信号是造成前馈环路中幅值失配和相位失配的重要原因之一,并分析该反射信号对前馈两个环路中误差信号的幅值和相位的影响以及对策,并推导出误差信号的幅值、相位变化量与反射信号所引起的幅值、相位失配的计算公式.最后针对该反射信号,设计了一个前馈电路,有效降低了非线性失真.This paper indicates that one of the important causes of amplitude-mismatch and phase-mismatch based on the traditional feedforward circuit is the main PA＇s echo.The effect on the amplitude and phase of bi-loops＇ feedforward circuit＇s error signal brought by the echo and some measures have been analyzed,thus the expressions of variations in amplitude and phase of the error signal against amplitude-mismatch and phase-mismatch have been proposed later.At last, a feedforward circuit against the echo has been designed to decrease the nonlinearization distortion effectively.

关 键 词：交调失真 前馈系统 幅值失配 相位失配 

分 类 号：TN722[电子电信—电路与系统]