2.8 A broadband CMOS digital power amplifier with hybrid Class-G Doherty efficiency enhancement

Spectrum-efficient modulations in modern wireless systems often result in large peak-to-average power ratios (PAPRs) for the transmitted signals. Therefore, PA efficiency at deep power back-off (PBO) levels (e.g., -12dB) becomes critical to extend the mobile's battery life. Classic techniques,...

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Bibliographic Details
Published in2015 IEEE International Solid State Circuits Conference (ISSCC) pp. 1 - 3
Main Authors Song Hu, Kousai, Shouhei, Hua Wang
Format Conference Proceeding Journal Article
LanguageEnglish
Published IEEE 01.02.2015
Subjects
Bandwidth
Circuits
CMOS
CMOS integrated circuits
Conferences
Electric power generation
Modulation
Power amplifiers
Radio frequency
Switches
Switching
Tracking
Varactors
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Summary:Spectrum-efficient modulations in modern wireless systems often result in large peak-to-average power ratios (PAPRs) for the transmitted signals. Therefore, PA efficiency at deep power back-off (PBO) levels (e.g., -12dB) becomes critical to extend the mobile's battery life. Classic techniques, i.e., outphasing, envelope tracking, and Doherty PAs, offer marginal efficiency improvement at deep PBO in practice. Dual-mode PAs require switches at the PA output for high-/low-power mode selection [1,2], posing reliability and linearity challenges. Although simple supply switching (Class-G) is effective at deep PBO, it only offers Class-B-like PBO efficiency in each supply mode [3,4]. Multi-level outphasing PA requires multiple supplies and frequent supply switching [5], resulting in substantial DC-DC converter overhead and exacerbated switching noise.
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SourceType-Conference Papers & Proceedings-2
ISBN:1479962236
9781479962235
ISSN:0193-6530
2376-8606
DOI:10.1109/ISSCC.2015.7062917