This work presents the equivalent electrical circuit (EEC) analysis of the 2-way Doherty Power Amplifier (DPA). For this purpose, the sub-amplifiers used in the 2-way DPA are modeled using real voltage sources instead of ideal sources. For the first time, the general voltage and current equations for each node of the EEC are determined using circuit theory with transmission line concepts. The analysis results explain some of the empirical practices carried out in other works to tune the 2-way DPA response, such as offset lines or asymmetrical bias voltages, etc. This analysis allows us to examine the impact that the auxiliary sub-amplifier bias voltage has on the efficiency of the 2-way DPA, suggesting the use of the phase-to-amplitude distortion (AM-PM) of the auxiliary sub-amplifier to eliminate the compensation lines that are commonly implemented arbitrarily in the 2-way DPA, whose objective is to synchronize the output signals of the subamplifiers. The experimental data of a 20 W (43 dBm) 2-way DPA designed and fabricated for a central frequency of 1.875 GHz with GaN transistors validate the proposed idea, resulting in a compact design and a significantly reduced design time.

中文翻译：

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设计没有偏移补偿线的Doherty功率放大器

这项工作介绍了2路Doherty功率放大器（DPA）的等效电路（EEC）分析。为此，使用有功电压源而不是理想电源对2路DPA中使用的子放大器进行建模。首次使用带有传输线概念的电路理论确定了EEC每个节点的一般电压和电流方程。分析结果解释了在其他工作中为调整2路DPA响应而进行的一些经验实践，例如偏置线或不对称偏置电压等。该分析使我们能够检查辅助子放大器偏置电压的影响。具有2路DPA的效率，建议使用辅助子放大器的相位至幅度失真（AM-PM）来消除通常在2路DPA中任意实施的补偿线，其目的是使子放大器的输出信号同步。使用GaN晶体管为1.875 GHz中心频率设计和制造的20 W（43 dBm）2路DPA的实验数据验证了所提出的想法，从而实现了紧凑的设计并显着减少了设计时间。