A 39 GHz Doherty-Like Power Amplifier With 22dBm Output Power and 21% Power-Added Efficiency at 6dB Power Back-Off

Chen, L; Chen, L; Sun, D; Sun, Y; Pan, Y; Zhu, X

A 39 GHz Doherty-Like Power Amplifier With 22dBm Output Power and 21% Power-Added Efficiency at 6dB Power Back-Off

Chen, L Chen, L Sun, D Sun, Y Pan, Y Zhu, X

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Publisher:: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Publication Type:: Journal Article
Citation:: IEEE Journal on Emerging and Selected Topics in Circuits and Systems, 2024, 14, (1), pp. 88-99
Issue Date:: 2024-03-01

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Field	Value	Language
dc.contributor.author	Chen, L
dc.contributor.author	Chen, L
dc.contributor.author	Sun, D
dc.contributor.author	Sun, Y
dc.contributor.author	Pan, Y
dc.contributor.author	Zhu, X https://orcid.org/0000-0002-5814-394X
dc.date.accessioned	2024-10-09T01:55:37Z
dc.date.available	2024-10-09T01:55:37Z
dc.date.issued	2024-03-01
dc.identifier.citation	IEEE Journal on Emerging and Selected Topics in Circuits and Systems, 2024, 14, (1), pp. 88-99
dc.identifier.issn	2156-3357
dc.identifier.issn	2156-3365
dc.identifier.uri	http://hdl.handle.net/10453/181303
dc.description.abstract	The design of a Doherty-like power amplifier for millimetre-wave (mm-wave) applications is presented in this work. The designed power amplifier employs a novel symmetrical load-modulated balanced amplifier (S-LMBA) architecture. This design is advantageous in minimizing the undesired impedance interaction often encountered in the classic LMBA approach. Such interactions are typically due to the use of a non-50~\Omega load at the isolation port of the output quadrature coupler. Moreover, magnitude and phase control networks are carefully designed to generate the specific magnitude and phase information for the designed S-LMBA. To demonstrate the proposed ideas, the S-LMBA is fabricated in a 45-nm CMOS SOI technology. At 39 GHz, a 22.1 dBm saturated output power (\text{P}_{\mathrm {sat}} ) with a maximum power-added efficiency (PAE) of 25.7% is achieved. In addition, 1.68 times drain efficiency enhancement is obtained over an ideal Class-B operation, when the designed S-LMBA is operated at 6 dB power back-off. An average output power of 13.1 dBm with a PAE of 14.4% at an error vector magnitude (EVM_{\mathrm {rms}} ) above -22.5 dB and adjacent channel power ratio (ACPR) of -23 dBc is also achieved, when a 200 MHz single carrier 64-quadrature-amplitude-modulation (QAM) signal is used. Including all testing pads, the footprint of the designed S-LMBA is only 1.56 mm2.
dc.language	English
dc.publisher	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
dc.relation.ispartof	IEEE Journal on Emerging and Selected Topics in Circuits and Systems
dc.relation.isbasedon	10.1109/JETCAS.2024.3351075
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	4008 Electrical engineering
dc.title	A 39 GHz Doherty-Like Power Amplifier With 22dBm Output Power and 21% Power-Added Efficiency at 6dB Power Back-Off
dc.type	Journal Article
utslib.citation.volume	14
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	University of Technology Sydney/Strength - GBDTC - Global Big Data Technologies
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
pubs.organisational-group	University of Technology Sydney/UTS Groups
pubs.organisational-group	University of Technology Sydney/UTS Groups/Global Big Data Technologies Centre (GBDTC)
utslib.copyright.status	closed_access	*
dc.date.updated	2024-10-09T01:55:35Z
pubs.issue	1
pubs.publication-status	Published
pubs.volume	14
utslib.citation.issue	1

Abstract:

The design of a Doherty-like power amplifier for millimetre-wave (mm-wave) applications is presented in this work. The designed power amplifier employs a novel symmetrical load-modulated balanced amplifier (S-LMBA) architecture. This design is advantageous in minimizing the undesired impedance interaction often encountered in the classic LMBA approach. Such interactions are typically due to the use of a non-50~\Omega load at the isolation port of the output quadrature coupler. Moreover, magnitude and phase control networks are carefully designed to generate the specific magnitude and phase information for the designed S-LMBA. To demonstrate the proposed ideas, the S-LMBA is fabricated in a 45-nm CMOS SOI technology. At 39 GHz, a 22.1 dBm saturated output power (\text{P}_{\mathrm {sat}} ) with a maximum power-added efficiency (PAE) of 25.7% is achieved. In addition, 1.68 times drain efficiency enhancement is obtained over an ideal Class-B operation, when the designed S-LMBA is operated at 6 dB power back-off. An average output power of 13.1 dBm with a PAE of 14.4% at an error vector magnitude (EVM_{\mathrm {rms}} ) above -22.5 dB and adjacent channel power ratio (ACPR) of -23 dBc is also achieved, when a 200 MHz single carrier 64-quadrature-amplitude-modulation (QAM) signal is used. Including all testing pads, the footprint of the designed S-LMBA is only 1.56 mm2.

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http://hdl.handle.net/10453/181303