Journal of Zhejiang University

ENGINEERING Information Technology & Electronic Engineering 2026 Vol.27 No.8 P.1-11

http://doi.org/10.1631/ENG.ITEE.2026.0058

Power amplifier linearization architecture with complementary filtering for broadband signal transmission

Author(s): Huihui FEI, Yucheng YU, Peng CHEN, Chao YU
Affiliation(s): 1. State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China more
Corresponding email(s): chao.yu@seu.edu.cn
Key Words: Broadband linearization, Digital predistortion, Multimode filter, Power amplifier (PA)

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Huihui FEI, Yucheng YU, Peng CHEN, Chao YU. Power amplifier linearization architecture with complementary filtering for broadband signal transmission[J]. Journal of Zhejiang University Science C, 2026, 27(8): 1-11.

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author="Huihui FEI, Yucheng YU, Peng CHEN, Chao YU",
journal="Journal of Zhejiang University Science C",
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pages="1-11",
year="2026",
publisher="Zhejiang University Press & Springer",
doi="10.1631/ENG.ITEE.2026.0058"
}

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%A Peng CHEN
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%I Zhejiang University Press & Springer
%DOI 10.1631/ENG.ITEE.2026.0058

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T1 - Power amplifier linearization architecture with complementary filtering for broadband signal transmission
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A1 - Peng CHEN
A1 - Chao YU
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%@ 1869-1951
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/ENG.ITEE.2026.0058

Abstract
Chinese Summary
Academic Network
Reviewer Comment

Abstract: This paper proposes a power amplifier (PA) linearization architecture with complementary filtering to realize high-linearity broadband signal transmission. The architecture fully leverages the advantages of analog and digital filtering techniques, ensuring high harmonic suppression within a compact size and reducing the demand for digital resources. A miniaturized triple-mode bandpass filter (BPF) with a wide stopband is integrated, which effectively suppresses the harmonic components of the PA output. Meanwhile, digital filtering is employed to mitigate intermodulation distortion (IMD) that cannot be effectively suppressed by the integrated analog filter, thus forming a complementary filtering digital predistortion (CF-DPD). As the CF-DPD herein focuses only on addressing the residual distortion left by analog filtering, it naturally reduces the system’s sampling rate requirements. Experimental results demonstrate that the proposed filtering power amplifier with integrated feedback port (FPA-FB) delivers 38.7–40.5 dBm output power, 8.4–11.9 dB gain, and a peak power-added efficiency (PAE) of 42.6%–52.1%. The prototype occupies an overall size of 67 mm×32 mm, corresponding to 1.1λ_g×0.5λ_g, indicating a compact implementation. Moreover, when transmitting a 400-MHz 5G new radio (NR) signal, the system achieves a normalized mean square error (NMSE) of -32.2 dB and an adjacent channel leakage ratio (ACLR) of -45.1/-47.2 dBc at a reduced sampling rate of 850 mega samples per second (MSPS).

面向宽带信号传输的互补滤波功率放大器线性化架构

费慧慧¹，郁煜铖²，陈鹏¹，余超^1,3
¹东南大学毫米波国家重点实验室，中国南京市，210096
²香港理工大学电机及电子工程学系，中国香港，999077
³紫金山实验室，中国南京市，211111
摘要：为实现高线性宽带信号传输，提出一种互补滤波功率放大器（PA）线性化架构。该架构充分利用模拟和数字滤波技术的优势，在保证紧凑尺寸的同时实现高谐波抑制，并显著降低数字资源消耗。通过集成一个具有宽阻带的小型化三模带通滤波器，能够有效抑制PA输出的谐波分量。同时，引入数字滤波来消除模拟滤波器无法完全抑制的互调失真，从而构建互补滤波数字预失真（CF-DPD）。由于该CF-DPD仅需处理模拟滤波后的残留失真，因此降低了系统对采样率的要求。实验结果表明，所提出的采用集成反馈端口的滤波功率放大器可实现38.7–40.5 dBm的输出功率，8.4–11.9 dB的增益，以及42.6%–52.1%的峰值功率附加效率。该原型尺寸为67 mm×32 mm（1.1λ_g×0.5λ_g），具有良好的紧凑性。此外，在传输400 MHz 5G新无线电信号时，系统在每秒850兆个样本的低采样率下，实现了−32.2 dB的归一化均方误差和−45.1/−47.2 dBc的邻道泄漏比。

关键词：宽带线性化；数字预失真；多模滤波器；功率放大器

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