A 28GHz packaged chireix transmitter with direct on-antenna outphasing load modulation achieving 56%/38% PA efficiency at Peak/6dB back-off output power
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Date
2018Type
- Conference Paper
ETH Bibliography
no
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Abstract
This paper presents a packaged 28GHz Chireix outphasing transmitter (TX) for power amplifier (PA) efficiency enhancement at peak and back-off output power (PBO). It utilizes a high-efficiency dual-feed loop antenna (DLA)-based non-isolating power combiner to realize direct on-antenna power combining and more importantly, outphasing active load modulation. The proposed Chireix TX contains two phase-shifted sub-TXs simultaneously driving a DLA on package. The TX chips are implemented in a 45nm CMOS SOI process and integrated with the DLA by flip-chip packaging. The measurements demonstrate a 56% PA drain efficiency (η D ) at saturated power (Psat), with 38% η D at 6dB PBO, achieving 1.36× efficiency enhancement over ideal Class-B operation. The high efficiency of this Chireix TX enables up to 34%/10.5dBm PA average efficiency/output power (η ave /P ave ) while amplifying 15Gb/s 64-QAM signal at 28GHz with EVM/ACLR better than -27.5dBc/-28dBc in a wireless radiation testing environment. Show more
Publication status
publishedExternal links
Book title
2018 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)Pages / Article No.
Publisher
IEEEEvent
Subject
5G communication; Antenna feeds; Chireix; CMOS; Milimetre-wave; Outphasing; Power amplifier; Transmitter; Wireless communicationOrganisational unit
09757 - Wang, Hua / Wang, Hua
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ETH Bibliography
no
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