面向无限射频带宽的伪doherty负载调制平衡放大器的信号流分析与设计

IF 4.1 1区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Microwave Theory and Techniques Pub Date : 2024-11-21 DOI:10.1109/TMTT.2024.3497894

Pingzhu Gong;Jiachen Guo;Niteesh Bharadwaj Vangipurapu;Kenle Chen

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引用次数: 0

摘要

本文报道了首个用于新兴4G/5G通信和多频段操作的十年带宽伪doherty负载调制平衡放大器（PD-LMBA）。通过使用基于s矩阵的信号流方法重新审视负载调制平衡放大器（LMBA）理论，考虑到所有组件的频率依赖特性，开发了宽带LMBA操作的广义理论。此外，通过分析LMBA的信号流特性，确定了频率不可知的相位对准条件是保证宽带固有负载调制的关键条件。这种独特的设计方法首次实现了宽带平衡放大器（BA，作为调峰）和控制放大器（CA，作为载波）的独立优化，从而从根本上解决了宽带负载调制功率放大器（pa）设计的长期限制。为了证明提出的概念，使用GaN技术设计和开发了超宽带rf输入PD-LMBA，覆盖频率范围为0.2至2 GHz。实验结果表明，峰值输出功率效率为51% ~ 72%，10db输出功率回退（OBO）效率为44% ~ 62%。

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Signal-Flow-Based Analysis and Design of Pseudo-Doherty Load-Modulated Balanced Amplifier Toward Unlimited RF Bandwidth

This article reports a first-ever decade-bandwidth pseudo-Doherty load-modulated balanced amplifier (PD-LMBA), designed for emerging 4G/5G communications and multiband operations. By revisiting the load-modulated balanced amplifier (LMBA) theory using an S-matrix-based signal-flow approach, a generalized theory for wideband LMBA operation is developed, taking into account the frequency-dependent nature of all components. In addition, by analyzing the signal-flow behavior of LMBA, a frequency-agnostic phase-alignment condition is identified as critical for ensuring intrinsic broadband load modulation. This unique design methodology enables, for the first time, the independent optimization of broadband balanced amplifier (BA, as the peaking) and control amplifier (CA, as the carrier), thus fundamentally addressing the longstanding limits imposed on the design of wideband load-modulated power amplifiers (PAs). To prove the proposed concept, an ultrawideband RF-input PD-LMBA is designed and developed using GaN technology covering the frequency range from 0.2 to 2 GHz. Experimental results demonstrate an efficiency of 51%–72% for peak output power and 44%–62% for 10-dB output power back-off (OBO), respectively.

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来源期刊

IEEE Transactions on Microwave Theory and Techniques 工程技术-工程：电子与电气

CiteScore

8.60

自引率

18.60%

发文量

486

审稿时长

6 months

期刊介绍： The IEEE Transactions on Microwave Theory and Techniques focuses on that part of engineering and theory associated with microwave/millimeter-wave components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, and industrial, activities. Microwave theory and techniques relates to electromagnetic waves usually in the frequency region between a few MHz and a THz; other spectral regions and wave types are included within the scope of the Society whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design.