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Comparison of S-Band Analog and Dual-Input Digital Doherty Power Amplifiers

机译：S波段模拟和双输入数字Doherty功率放大器的比较

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摘要

This work aims at assessing the performance improvement offered by a dual-input digitally driven Doherty power amplifier (DPA) with respect to the single-input topology. To this aim, an analog DPA is designed and characterized. The equivalent digital version, which only differs by the absence of the input power divider, is also realized and analyzed. This ensures a fair comparison of the two topologies. Power-dependent input signal splitting between the main and auxiliary branches as well as adaptive phase alignment are adopted in the digital version to compensate for the back-off efficiency degradation as well as other shortcomings typically shown by traditional analog DPAs. For the first time, the performance figures of merit of the equivalent analog and digital DPAs are compared one-to-one systematically. The comparison over the 3.1-3.7 GHz range shows a superior efficiency performance of the digital DPA over the analog one, both at saturation and in back-off. Furthermore, the dual-input control also ensures higher gain and saturated output power.
机译：这项工作旨在评估双输入数字驱动Doherty功率放大器（DPA）在单输入拓扑方面的性能改进。为了这个目的，设计和表征了模拟DPA。还实现并分析了等效数字版本，仅由于缺少输入功率分配器而有所不同。这样可以确保对这两种拓扑进行公平的比较。在数字版本中，主要和辅助分支之间的功率相关输入信号分配以及自适应相位对准被采用，以补偿退避效率的下降以及传统模拟DPA通常表现出的其他缺点。首次系统性地比较了等效模拟和数字DPA的性能指标。在3.1-3.7 GHz范围内的比较表明，无论在饱和还是在退避方面，数字DPA的效率均优于模拟DPA。此外，双输入控制还确保了更高的增益和饱和输出功率。

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