Novel Dual-Band Matching Network for Effective Design of Concurrent Dual-Band Power Amplifiers
Novel Dual-Band Matching Network for Effective Design of Concurrent Dual-Band Power Amplifiers
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DOI：
10.1109/tcsi.2013.2268132
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发表时间：
2014-01-01
影响因子：
5.1
通讯作者：
Boumaiza, Slim
中科院分区：
文献类型：
--
作者：
Fu, Xin;Bespalko, Dylan T.;Boumaiza, Slim
在本文中，提出了一种系统的方法来合成一种新的双频匹配网络，并应用于设计一个双频功率放大器（PA）能够保持高功率效率在两个任意的，广泛的间隔频率。拟议的网络包括两个不同的阶段。第一种方法将两个工作频率下的目标复阻抗转换为真实的复阻抗。第二级是双频带滤波器，确保前一个真实的阻抗与终端阻抗匹配。在两个级之间加入一条附加的传输线，以调整二次和三次谐波处的阻抗，而不改变基频处的阻抗。谐波终止控制在提高射频晶体管的效率方面非常有效，特别是在利用J类设计空间时。提出的双频匹配网络的合成方法，应用于设计一个双频PA使用封装的45 W氮化镓（GaN）晶体管。PA原型在800 MHz和1.9 GHz的工作频率下保持约68%的峰值功率效率。此外，一个基于沃尔泰拉的数字预失真技术被成功地应用到线性化的PA响应周围的两个工作频率。
In this paper, a systematic approach to the synthesis of a novel dual-band matching network is proposed and applied to design a dual-band power amplifier (PA) capable of maintaining high power efficiency at two arbitrary, widely spaced frequencies. The proposed network incorporates two different stages. The first one transforms the targeted complex impedances, at the two operating frequencies, to a real one. The second stage is a dual band filter that ensures the matching of the former real impedance to the termination impedance. An additional transmission line is incorporated between the two stages to adjust the impedances at the second and third harmonics without altering the impedances seen at the fundamental frequencies. The harmonic termination control is very effective in enhancing the efficiency of radio frequency transistors, especially when exploiting the Class J design space. The proposed dual-band matching network synthesis methodology was applied to design a dual band PA using a packaged 45 W Gallium Nitride (GaN) transistor. The PA prototype maintained a peak power efficiency of about 68% at operating frequencies of 800 MHz and 1.9 GHz. In addition, a Volterra based digital pre-distortion technique was successfully applied to linearize the PA response around the two operating frequencies.