Fully Integrated GaAs MMIC Bandpass Filtering Power Amplifier Chip With Compact Couple-Line-Based Matching Network

作者：Xiaopan Chen, Yongle Wu, Zhuoyin Chen, Moushu Yang, Shuchen Zhen, Weimin Wang · 发表于：IEEE Microwave and Wireless Technology Letters · 年份：2025 · DOI：10.1109/lmwt.2025.3578722 · 被引用次数：5 · 研究领域：Advanced Power Amplifier Design、Microwave Engineering and Waveguides、Radio Frequency Integrated Circuit Design

This letter presents a novel bandpass filtering power amplifier (FPA) structure featuring a dc-block input matching network (IMN), which utilizes a filtering impedance transformer consisting of two cascaded coupled-lines, a short-circuit coupled-line (SCCL), and a parallel resonator (PR). The SCCL generates transmission zeros (TZs) near the passband, enabling sharp roll-off characteristics. The PR enhances filtering response while occupying minimal circuit area. For verification, a monolithic microwave-integrated circuit (MMIC) FPA using 0.25-$\mu $m GaAs process was designed and fabricated, implementing serpentine routing for a highly compact layout. The measurement results demonstrate 30-dB out-of-band rejection, 27-dBm output power, and 46%–55% drain efficiency (DE) in 9–11 GHz. The adjacent channel power ratio (ACPR) is lower than −48.4 dBc with digital predistortion (DPD) using a 60-MHz 64-QAM 5G-NR signal.