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arXiv · 2511.12137

A 24-GHz CMOS Transformer-Based Three-Tline Series Doherty Power Amplifier Achieving 39% PAE

Zheng Wang·Yifu Li·Yuchao Mei·Xinyu Sui·Qingbin Li·Xu Luo·Rui Wang·Dongxin Ni·Jian Pang
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Abstract

This paper presents a transformer-based three- transmission-line (Tline) series Doherty power amplifier (PA) implemented in 65-nm CMOS, targeting broadband K/Ka-band applications. By integrating an impedance-scaling network into the output matching structure, the design enables effective load modulation and reduced impedance transformation ratio (ITR) at power back-off when employing stacked cascode transistors. The PA demonstrates a -3-dB small-signal gain bandwidth from 22 to 32.5 GHz, a saturated output power (Psat) of 21.6 dBm, and a peak power-added efficiency (PAE) of 39%. At 6dB back-off, the PAE remains above 24%, validating its suitability for high- efficiency mm-wave phased-array transmitters in next-generation wireless systems.

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Zheng Wang, Yifu Li, Yuchao Mei, Xinyu Sui, Qingbin Li, Xu Luo, Rui Wang, Dongxin Ni, Jian Pang. 2025-11-15. A 24-GHz CMOS Transformer-Based Three-Tline Series Doherty Power Amplifier Achieving 39% PAE. https://arxiv.org/abs/2511.12137

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