A Compact Single Transformer Footprint Hybrid Current-Voltage Digital Doherty Power Amplifier
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Date
2022Type
- Conference Paper
ETH Bibliography
yes
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Abstract
This paper presents a fully integrated single footprint hybrid current-voltage mode digital Doherty power amplifier (PA). A prototype PA is implemented in a 45nm CMOS SOI process. The proposed PA design provides enhanced linearity through adaptive biasing-based AM-PM distortion mitigation of the current mode digital PA and AM-PM cancelation through hybrid current/voltage mode Doherty-based power combining. It achieves 21.7dBm peak output power (Psat) at 1.2GHz and 37.6% drain efficiency (DE) at 1.4GHz. The proposed digital Doherty PA demonstrates 1.2×/1.22×PBO efficiency enhancement, compared to the ideal class-B at 3/6 dB PBO at 1.2GHz. The measured error vector magnitude (EVM) of 64-QAM/20MHz is −23dB with 22.8% average DE without DPD. This is the first demonstration of hybrid current-voltage mode Doherty power combining on a single footprint transformer over a broad bandwidth (BW). Show more
Publication status
publishedExternal links
Book title
IEEE Symposium on Radio Frequency Integrated Circuits (RFIC)Pages / Article No.
Publisher
IEEEEvent
Subject
AM-PM compensation; CMOS; digital power amplifier (DPA); Doherty; hybrid; linearity; load modulation; phase distortion; polar modulation; power back-off (PBO)Organisational unit
09757 - Wang, Hua / Wang, Hua
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ETH Bibliography
yes
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