摘要
文章对步进式包络跟踪功率放大器(SET-PA)的宏模型进行了建立分析。基于SET-PA的特殊特点,对时间误差补偿进行了研究。使用一种基于最小均方误差(MMSE)的自适应时延估计的方法估计包络跟踪功率放大器(ET-PA)中两路之间的时间差值。数据结果显示,SET-PA的电压档数对包络支路的低通滤波器对功放带来的记忆效应的影响较为敏感。仿真结果显示,使用最小均方误差的方法去补偿ET-PA的时间差,可以使ACPR提高6-7d B,而且带来更快的收敛速度和更低的EVM。
In this paper, a macro model for step envelope tracking power amplifiers （SET-PA） is studied. Based on the specific characteristics of SET-PA, the compensation of the time mismatch is researched. An adaptive time delay estimation method based on minimum mean square error （MMSE） criterion is used to estimate the time delay to compensation time mismatch between two signal paths in ET-PA. The analytical result indicates that the variable voltage levels of SET-PA are sensitive to the memory effect generated by the low-pass filter. The simulation results show that using MMSE method to compensate the time mismatch of ET-PA can improve ACPR performance by 6-7dB compared to the case without compensation. And it performs higher convergence speed while achieving acceptable EVM.
出处
《电子技术（上海）》
2015年第3期26-30,25,共6页
Electronic Technology
关键词
包络跟踪
宏模型
最小均方误差
时间误差补偿
envelope tracking amplifier
macro model
MMSE
time mismatch compensation.
