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1. CN103457541 - Method for widening bandwidth of Doherty power amplifier and Doherty power amplifier improved with method

Office China
Application Number 201310414727.X
Application Date 12.09.2013
Publication Number 103457541
Publication Date 18.12.2013
Grant Number 103457541
Grant Date 28.09.2016
Publication Kind B
IPC
H03F 1/07
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
1Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
02Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
04in discharge-tube amplifiers
06to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators
07Doherty-type amplifiers
H03F 1/42
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
1Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
42Modifications of amplifiers to extend the bandwidth
Applicants University of Electronic Science and Technology of China
Inventors He Songbai
Hou Xianyun
Wang Xianfei
Wang Peng
Tong Renbin
Ma Li
You Fei
Agents liu keqi
Title
(EN) Method for widening bandwidth of Doherty power amplifier and Doherty power amplifier improved with method
(ZH) 一种拓宽Doherty功率放大器带宽的方法及用该方法改进的Doherty功率放大器
Abstract
(EN)
The invention provides a method for widening the bandwidth of a Doherty power amplifier and the Doherty power amplifier improved with the method. The Doherty power amplifier comprises a bandwidth power distributor module, a bandwidth input matching network module, a main power amplifier, a peak value power amplifier, a bandwidth output matching network module, a compensation line module and an impedance converter module, wherein the compensation line module comprises a compensation line of a main power amplifier branch and a compensation line of the peak value power amplifier branch, the compensation line of the main power amplifier branch converts load impedance into an optimal load impedance point in a lower power state; the compensation line of the peak value power amplifier branch enables the output impendence of the peak value power amplifier to present infinity and prevents the power of the main amplifier from being leaked to the peak value power amplification branch in a low power state. According to the invention, the bandwidth of the Doherty power amplifier can be widened and the returning efficiency of the Doherty power amplifier can be improved, load conditioning can be better achieved, the Doherty power amplifier can be applied to a multi-module base station and software radio, and energy conservation and cost reduction are facilitated.

(ZH)
本发明提供一种拓宽Doherty功率放大器带宽的方法及用该方法改进的Doherty功率放大器,包括:宽带功率分配器模块、宽带输入匹配网络模块、主功放和峰值功放、宽带输出匹配网络模块、补偿线模块、阻抗变换器模块,补偿线模块包括主功放支路的补偿线和峰值功放的补偿线,主功放支路的补偿线在低功率状态下将负载阻抗变换到最优负载阻抗点,峰值功放支路的补偿线在低功率状态下,使峰值功放的输出阻抗呈现无穷大,防止主功放的功率泄漏到峰值功放支路。本发明可以扩展Doherty功率放大器的带宽以及回退效率,能够更好的实现负载调制,可应用于多模基站和软件无线电,有利于节约能源和削减成本。