Design of a Load Modulated Balanced Amplifier with a Two-Stage Control Power Amplifier

IF 1.6 3区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Journal of electromagnetic engineering and science Pub Date : 2023-05-31 DOI:10.26866/jees.2023.3.r.170
Sagini E. Mochumbe, Youngoo Yang
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Abstract

While an ideal Doherty power amplifier has a linear response, the load modulated balanced amplifier (LMBA) has a compressive response under ideal conditions. This inherent nonlinear characteristic is due to the lower power contribution of the single auxiliary device as the balanced amplifier transistors approach compression. This article presents an LMBA with a two-stage control signal amplifier in place of the single auxiliary device. The idea is to preserve a high and constant gain across the high- and low-power regions by tuning the two-stage gain control signal to match the balanced amplifier gain. An optimal load trajectory can be found for a high-efficiency design by appropriately terminating the second harmonic while ensuring an optimal impedance match in all devices. At the same time, by setting an optimal output power from the auxiliary device, sufficient power is provided to linearize the response of the main power amplifier beyond the output back-off power boundary. As proof of concept, a prototype is designed and implemented. The experimental measurements demonstrate a drain efficiency of 59%–64% at maximum output power and 46%–52% at 7.5 dB output back-off power over the target frequency range of 3.3–3.8 GHz.
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具有两级控制功率放大器的负载调制平衡放大器的设计
理想的多尔蒂功率放大器具有线性响应,而负载调制平衡放大器(LMBA)在理想条件下具有压缩响应。这种固有的非线性特性是由于当平衡放大器晶体管接近压缩时,单个辅助器件的功率贡献较低。本文介绍了一种用两级控制信号放大器代替单辅助装置的LMBA。这个想法是通过调整两级增益控制信号来匹配平衡放大器增益,从而在高功率和低功率区域保持高增益和恒定增益。通过适当地终止二次谐波,同时确保所有器件的最佳阻抗匹配,可以找到高效设计的最佳负载轨迹。同时,通过设置辅助器件的最佳输出功率,提供足够的功率来线性化主功率放大器的响应,使其超出输出回退功率边界。作为概念验证,设计并实现了原型。实验测量表明,在3.3-3.8 GHz目标频率范围内,最大输出功率时漏极效率为59% ~ 64%,输出回退功率为7.5 dB时漏极效率为46% ~ 52%。
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来源期刊
Journal of electromagnetic engineering and science
Journal of electromagnetic engineering and science ENGINEERING, ELECTRICAL & ELECTRONIC-
CiteScore
2.90
自引率
17.40%
发文量
82
审稿时长
10 weeks
期刊介绍: The Journal of Electromagnetic Engineering and Science (JEES) is an official English-language journal of the Korean Institute of Electromagnetic and Science (KIEES). This journal was launched in 2001 and has been published quarterly since 2003. It is currently registered with the National Research Foundation of Korea and also indexed in Scopus, CrossRef and EBSCO, DOI/Crossref, Google Scholar and Web of Science Core Collection as Emerging Sources Citation Index(ESCI) Journal. The objective of JEES is to publish academic as well as industrial research results and discoveries in electromagnetic engineering and science. The particular scope of the journal includes electromagnetic field theory and its applications: High frequency components, circuits, and systems, Antennas, smart phones, and radars, Electromagnetic wave environments, Relevant industrial developments.
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