A Broadband Switched-Transformer Digital Power Amplifier for Deep Back-Off Efficiency Enhancement

Yun Yin; Tong Li; Liang XiongYicheng LiHao MinNa YanHongtao Xu

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A Broadband Switched-Transformer Digital Power Amplifier for Deep Back-Off Efficiency Enhancement

机译：A Broadband Switched-Transformer Digital Power Amplifier for Deep Back-Off Efficiency Enhancement

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摘要

This article presents a switched-transformer-based polar Doherty digital power amplifier (DPA) for deep back-off efficiency enhancement. A single-transformer-footprint parallel-combining transformer (PCT) power combiner is introduced for 1.3–3.5-GHz wide frequency coverage, dynamic load modulation at 0-/6-/12-/18-dB power back-off (PBO) levels, and an ultra-compact die size. Implemented in 40-nm CMOS, the DPA is powered by a 1.1-V supply and only occupies 0.7 inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" tex-math notation="LaTeX"$times $ /tex-math/inline-formula 1.15 mmsup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"2/sup chip area. It achieves 21.4-dBm peak power with the power added efficiencies (PAEs) of 31.3%, 27.7%, 16.6%, and 7.7% for 0-/6-/12-/18-dB PBOs at 1.5 GHz. With 20-MHz 64QAM long term evolution (LTE) signal, the DPA achieves inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" tex-math notation="LaTeX"${P}_{{text {avg}}}$ /tex-math/inline-formula of 15.2 dBm and the average PAE of 25.3% with ?32.5-dB error vector magnitude (EVM) at 1.5 GHz. Moreover, for 20-MHz 64 QAM WLAN signal, inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" tex-math notation="LaTeX"${P}_{{text {avg}}}$ /tex-math/inline-formula of 14.7 dBm with the average PAE of 20.1% is obtained with ? 25-dB EVM at 2.4 GHz.

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来源
《IEEE Journal of Solid-State Circuits》 |2020年第11期|2997-3008|共12页
作者
Yun Yin; Tong Li; Liang XiongYicheng LiHao MinNa YanHongtao Xu;
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作者单位

State Key Laboratory of ASIC and System, Fudan University, Shanghai, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类基本电子电路;
关键词
Switches; Modulation; Impedance; Power combiners; Power generation; Coils; Switching circuits;

A Broadband Switched-Transformer Digital Power Amplifier for Deep Back-Off Efficiency Enhancement

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