Linear Doherty power amplifier design based on adaptive input signal power control

IF 5.8 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Engineering Science and Technology-An International Journal-Jestech Pub Date : 2025-12-01 Epub Date: 2025-12-05 DOI:10.1016/j.jestch.2025.102247

Zhiqing Liu , Ye Zhong , Zhijiang Dai

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引用次数: 0

Abstract

In modern wireless communication systems, the trade-off between efficiency and linearity in Doherty power amplifiers (DPAs) remains a critical challenge. To address this, a novel Schottky diode-based input matching network is presented for peaking power amplifiers (PAs) which leverages a dual optimization mechanism: (1) adaptive gate DC bias adjustment via Schottky rectification, enabling Class B operation in high-power regions to enhance DPA linearity; and (2) nonlinear impedance modulation to suppress premature peaking PA activation in low-power regions, thereby improving back-off efficiency. Based on this structure, an asymmetric DPA is designed and manufactured, with continuous wave test results showing that saturation efficiency is higher than 50%, saturated output power reaches more than 43.4 dBm, and the back-off efficiency of 9 dB is 41.2%–55.6% in the operating band of 0.75–1.25 GHz. The adjacent channel power ratio (ACPR) of the PA is tested using a 20 MHz quadrature amplitude modulation (QAM) signal with a PAPR of 9 dB, and the test results show that, in the band of 1.0–1.3 GHz, the ACPR is −38.1 to −34.0 dBc and average efficiency is from 34.2%–45.5% at an average output power of 36 dBm, which verifies that the designed DPA has good linearity performance.

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基于自适应输入信号功率控制的线性多尔蒂功率放大器设计

在现代无线通信系统中，Doherty功率放大器（dpa）的效率和线性度之间的权衡仍然是一个关键的挑战。为了解决这个问题，提出了一种新的基于肖特基二极管的峰值功率放大器（pa）输入匹配网络，该网络利用双重优化机制：(1)通过肖特基整流自适应栅极直流偏置调整，使B类工作在高功率区域，提高DPA线性度；(2)非线性阻抗调制，抑制低功率区域PA的过早峰值激活，从而提高退退效率。基于该结构设计并制造了非对称DPA，连续波测试结果表明，在0.75 ~ 1.25 GHz工作频段，饱和效率高于50%，饱和输出功率大于43.4 dBm， 9db的回退效率为41.2% ~ 55.6%。采用PAPR为9 dB的20 MHz正交调幅（QAM）信号对该放大器的邻道功率比（ACPR）进行了测试，测试结果表明，在1.0 ~ 1.3 GHz频段，平均输出功率为36 dBm时，ACPR为−38.1 ~−34.0 dBc，平均效率为34.2% ~ 45.5%，验证了所设计的DPA具有良好的线性性能。

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来源期刊

Engineering Science and Technology-An International Journal-Jestech Materials Science-Electronic, Optical and Magnetic Materials

CiteScore

11.20

自引率

3.50%

发文量

153

审稿时长

22 days

期刊介绍： Engineering Science and Technology, an International Journal (JESTECH) (formerly Technology), a peer-reviewed quarterly engineering journal, publishes both theoretical and experimental high quality papers of permanent interest, not previously published in journals, in the field of engineering and applied science which aims to promote the theory and practice of technology and engineering. In addition to peer-reviewed original research papers, the Editorial Board welcomes original research reports, state-of-the-art reviews and communications in the broadly defined field of engineering science and technology. The scope of JESTECH includes a wide spectrum of subjects including: -Electrical/Electronics and Computer Engineering (Biomedical Engineering and Instrumentation; Coding, Cryptography, and Information Protection; Communications, Networks, Mobile Computing and Distributed Systems; Compilers and Operating Systems; Computer Architecture, Parallel Processing, and Dependability; Computer Vision and Robotics; Control Theory; Electromagnetic Waves, Microwave Techniques and Antennas; Embedded Systems; Integrated Circuits, VLSI Design, Testing, and CAD; Microelectromechanical Systems; Microelectronics, and Electronic Devices and Circuits; Power, Energy and Energy Conversion Systems; Signal, Image, and Speech Processing) -Mechanical and Civil Engineering (Automotive Technologies; Biomechanics; Construction Materials; Design and Manufacturing; Dynamics and Control; Energy Generation, Utilization, Conversion, and Storage; Fluid Mechanics and Hydraulics; Heat and Mass Transfer; Micro-Nano Sciences; Renewable and Sustainable Energy Technologies; Robotics and Mechatronics; Solid Mechanics and Structure; Thermal Sciences) -Metallurgical and Materials Engineering (Advanced Materials Science; Biomaterials; Ceramic and Inorgnanic Materials; Electronic-Magnetic Materials; Energy and Environment; Materials Characterizastion; Metallurgy; Polymers and Nanocomposites)