Asymmetrical outphasing: Exploiting conjugate continuous modes of operation

Paolo Enrico de Falco; James Birchall; Souheil Ben Smida; Kevin Morris; Konstantinos Mimis; Gavin Watkins

doi:10.1109/PAWR.2017.7875562

Asymmetrical outphasing: Exploiting conjugate continuous modes of operation

Paolo Enrico de Falco, James Birchall, Souheil Ben Smida, Kevin Morris, Konstantinos Mimis, Gavin Watkins

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

5 Citations (Scopus)

63 Downloads (Pure)

Abstract

In conventional techniques for efficiency enhancement of outphasing systems, identical power amplifiers are employed for each branch while the output combining network is optimised using reactive compensating elements. In this work a methodology is presented for asymmetrical branch amplifier design based on the conjugate load modulation trajectories seen by each PA branch. Closed form equations and simulations are presented, demonstrating that conjugate modes of operation PAs can be used for the upper and lower amplifier branches in outphasing systems to achieve ideal maximum efficiency over the outphasing backoff range. As a proof of concept, Class B and Class J PAs were built using the Cree CGH40010 GaN HEMT. The Class J PA exhibited over 15% improvement in drain efficiency at 4dB back-off compared to the Class B PA when both were measured with the lower branch outphasing load trajectory.

Original language	English
Title of host publication	2017 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR)
Publisher	IEEE
Pages	18-21
Number of pages	4
ISBN (Electronic)	9781509034581
DOIs	https://doi.org/10.1109/PAWR.2017.7875562
Publication status	Published - 13 Mar 2017

Keywords

Power amplifier
Outphasing
Continuous mode
Class B/J

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10.1109/PAWR.2017.7875562

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Cite this

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title = "Asymmetrical outphasing: Exploiting conjugate continuous modes of operation",

abstract = "In conventional techniques for efficiency enhancement of outphasing systems, identical power amplifiers are employed for each branch while the output combining network is optimised using reactive compensating elements. In this work a methodology is presented for asymmetrical branch amplifier design based on the conjugate load modulation trajectories seen by each PA branch. Closed form equations and simulations are presented, demonstrating that conjugate modes of operation PAs can be used for the upper and lower amplifier branches in outphasing systems to achieve ideal maximum efficiency over the outphasing backoff range. As a proof of concept, Class B and Class J PAs were built using the Cree CGH40010 GaN HEMT. The Class J PA exhibited over 15% improvement in drain efficiency at 4dB back-off compared to the Class B PA when both were measured with the lower branch outphasing load trajectory.",

keywords = "Power amplifier, Outphasing, Continuous mode, Class B/J",

author = "{de Falco}, {Paolo Enrico} and James Birchall and {Ben Smida}, Souheil and Kevin Morris and Konstantinos Mimis and Gavin Watkins",

year = "2017",

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doi = "10.1109/PAWR.2017.7875562",

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T1 - Asymmetrical outphasing

T2 - Exploiting conjugate continuous modes of operation

AU - de Falco, Paolo Enrico

AU - Birchall, James

AU - Ben Smida, Souheil

AU - Morris, Kevin

AU - Mimis, Konstantinos

AU - Watkins, Gavin

PY - 2017/3/13

Y1 - 2017/3/13

N2 - In conventional techniques for efficiency enhancement of outphasing systems, identical power amplifiers are employed for each branch while the output combining network is optimised using reactive compensating elements. In this work a methodology is presented for asymmetrical branch amplifier design based on the conjugate load modulation trajectories seen by each PA branch. Closed form equations and simulations are presented, demonstrating that conjugate modes of operation PAs can be used for the upper and lower amplifier branches in outphasing systems to achieve ideal maximum efficiency over the outphasing backoff range. As a proof of concept, Class B and Class J PAs were built using the Cree CGH40010 GaN HEMT. The Class J PA exhibited over 15% improvement in drain efficiency at 4dB back-off compared to the Class B PA when both were measured with the lower branch outphasing load trajectory.

AB - In conventional techniques for efficiency enhancement of outphasing systems, identical power amplifiers are employed for each branch while the output combining network is optimised using reactive compensating elements. In this work a methodology is presented for asymmetrical branch amplifier design based on the conjugate load modulation trajectories seen by each PA branch. Closed form equations and simulations are presented, demonstrating that conjugate modes of operation PAs can be used for the upper and lower amplifier branches in outphasing systems to achieve ideal maximum efficiency over the outphasing backoff range. As a proof of concept, Class B and Class J PAs were built using the Cree CGH40010 GaN HEMT. The Class J PA exhibited over 15% improvement in drain efficiency at 4dB back-off compared to the Class B PA when both were measured with the lower branch outphasing load trajectory.

KW - Power amplifier

KW - Outphasing

KW - Continuous mode

KW - Class B/J

U2 - 10.1109/PAWR.2017.7875562

DO - 10.1109/PAWR.2017.7875562

M3 - Conference contribution

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BT - 2017 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR)

PB - IEEE

ER -

Asymmetrical outphasing: Exploiting conjugate continuous modes of operation

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Keywords

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