Efficiency Optimized Distributed Transformers for Broadband Monolithic Millimeter-Wave Integrated Power Amplifier Circuits

Efficiency Optimized Distributed Transformers for Broadband Monolithic Millimeter-Wave Integrated Power Amplifier Circuits
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用于宽带单片毫米波集成功率放大器电路的效率优化分布式变压器

DOI:
10.1109/tmtt.2017.2729514
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发表时间:
2017
影响因子:
4.3
通讯作者:
Massler
Massler
中科院分区:
工程技术1区
文献类型:
--
作者:
Leuther;Kallfass;Wagner;Massler

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本文修正了基于磁变压器的功率合成器/分配器阻抗变换网络的效率优化方程(例如,分布式有源Transformer)。它评估了它们在高毫米波频率下的可用性,其中Transformer的分布式行为及其损耗变得相关。正如所证明的,标准的优化方程不会导致最优结果。为了使分布式变压器的优化,提出了一种扩展的集总等效电路模型,并用于推导新的优化方程。新的方程使磁变压器的设计具有最大的效率。为了证明在毫米波频率下利用优化的分布式磁Transformer网络可以实现的性能,170-260 GHz)/H波段(即,220-325 GHz)功率放大器的性能。该放大器在260 GHz时的输出功率约为6.2 dBm,是在该频率范围内工作的mHEMT功率放大器的最新技术。然而,它的相对3 dB带宽为29%,超过了迄今为止所有报道的mHEMT PA。
This paper revises the efficiency optimization equations for magnetic-transformer-based power combiner/divider impedance transformation networks (e.g., distributed active transformer). It evaluates their usability for high millimeter-wave frequencies, where the distributed behavior of a transformer and its loss become relevant. As is demonstrated, the standard optimization equations do not lead to an optimum result. To enable the optimization of distributed transformers, an extended lumped equivalent circuit model is proposed and used for the derivation of new optimization equations. The novel equations enable the design of magnetic transformers with maximum efficiency. To demonstrate the performance that can be achieved with optimized distributed magnetic transformer networks at millimeter-wave frequencies, measurement results of an R-band (i.e., 170-260 GHz)/H-band (i.e., 220-325 GHz) power amplifier (PA) are presented. With an output power of approximately 6.2 dBm at 260 GHz, the amplifier is among the state of the art for mHEMT PAs operating in this frequency range. With its relative 3-dB bandwidth of 29%, however, it surpasses all those reported mHEMT PAs to date.
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