摘要
传统的单路并联式模拟预失真电路,其可调性不高,对功率放大器的三阶交调改善量也非常有限。为了解决上述问题,提出了一种能用开路短截线进行适当相位补偿的S波段模拟预失真电路。该模拟预失真电路使用肖特基二极管产生三阶交调信号,通过改变开路短截线的长度,来调整基波信号与三阶交调信号的相位差,使它的特性跟功率放大器的特性相反,从而抵消功放的三阶交调信号。实验结果表明,在3.5 GHz的AB类功放的1 dB压缩点处,加模拟预失真电路后,三阶交调量改善了约34 dB。
The traditional single parallel analog pre-distortion circuit has low adjustability and it is limited to improve the third-order intermodulation (IMD3) of the power amplifier. In order to solve the above problems, this paper presents an S-band analog predistortion circuit, which can effectively compensate the phase distortion using the open stub. The analog predistortion circuit can adjust the phase difference between the fundamental signal and the IMD3 signal generated by the Schottky diode. Consequently, the characteristics of the analog predistortion circuit are opposite to that of the power amplitier, thus the IMD3 signal of the power amplifier can be reduced. Experimental results show that using the analog predistortion circuit, the IMD3 has been reduced over 34 dB at the 1 dB of the 3.5 GHz class AB power amplifier.
作者
金豪权
许高明
黄季甫
张杰
JIN Hao-quan;XU Gao-ming;HUANG Ji-fu;ZHANG Jie(Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo 315211, China)
出处
《微波学报》
CSCD
北大核心
2018年第3期88-91,共4页
Journal of Microwaves
基金
国家自然科学基金(61501272,61571251,61631012)
宁波市自然科学基金(2016A610064)
作者简介
金豪权 男,1993年生,硕士。主要研究方向:微波功放非线性矫正技术研究,模拟预失真电路。E-mail:15757855416@163.com;许高明(通信作者)男,1985年生,博士,讲师。主要研究方向:高效射频功放、射频收发信机设计、数字和模拟预失真线性化技术。E-mail:xugaoming@nbu.edu.cn;黄季甫 男,教授。主要研究方向:微波毫米波无线通信、射频与通信电路设计。E-mail:huangjifu@nbu.edu.cn