In this paper, a systematic design of a dual-band power amplifier (PA) is presented. Using the inherent impedance matching flexibility of a Class J operating mode, we can start by relaxing the performance sensitivity and design requirements of the matching networks. Then, a novel dual-band matching network topology is devised to simultaneously present adequate source and load impedances at the fundamental and harmonic components of both targeted operating frequencies. The dual-band matching network is designed in two stages. First, a complex-to-real impedance transformation network, with harmonic control capability, is used to transform the complex impedance for class J operation to real impedance that is common to both operation frequencies. Then, a real-to-real trans-impedance transformer is synthesized using dual-band filter theory. This technique was successfully applied to design a dual-band 45W GaN Class J PA operating at 0.8GHz and 1.9GHz. The measurement results of the fabricated PA shows peak efficiencies of 74.4% at the lower band and 57.6% at the upper band.
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机译：本文提出了双频功率放大器（PA）的系统设计。利用J类工作模式固有的阻抗匹配灵活性，我们可以从放松对匹配网络的性能敏感性和设计要求开始。然后，设计了一种新颖的双频匹配网络拓扑，以在两个目标工作频率的基波和谐波分量上同时提供足够的源阻抗和负载阻抗。双频带匹配网络分为两个阶段。首先，使用具有谐波控制功能的复数到实际阻抗转换网络，将用于J类操作的复数阻抗转换为两个工作频率共有的实际阻抗。然后，利用双频滤波器理论合成了一个真实的跨阻抗变压器。该技术已成功应用于设计工作在0.8GHz和1.9GHz的双频段45W GaN Class J PA。制成的PA的测量结果显示，在较低频段的峰值效率为74.4％，在较高频段的峰值效率为57.6％。
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