A compact fully differential Doherty power amplifier

Shichang Chen; Quan Xue

doi:10.1109/IEEE-IWS.2013.6616784

A compact fully differential Doherty power amplifier

Shichang Chen^*
, Quan Xue

^*Corresponding author for this work

State Key Laboratory of Terahertz and Millimeter Waves (City University of Hong Kong)

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

1 Citation (Scopus)

Abstract

In this paper, a compact triple-transistor fully differential Doherty power amplifier (DPA) is investigated. Three active devices are combined in a very judicious way to amplify the differential signal in a way like what a typical Doherty amplifier does. Particularly, two out-of-phase carrier PAs are applied to operate in the low-power region for high efficiency. On the other hand, only one peaking PA is used in the high-power region, which shares its output evenly with the two carriers. The reduction of transistor number from four for a classic differential DPA to three greatly cuts down the realization cost and compacts the overall circuit. Theoretical analysis is given for deep understanding of the operation principle. To demonstrate the proposed technique, a prototype is implemented based on Cree's CGH40010 GaN HEMTs. Experimental result shows that 73% and 63% drain efficiencies are achieved at peak power and 6-dB back-off point, respectively. © 2013 IEEE.

Original language	English
Title of host publication	2013 IEEE International Wireless Symposium, IWS 2013
DOIs	https://doi.org/10.1109/IEEE-IWS.2013.6616784
Publication status	Published - 2013
Event	2013 IEEE International Wireless Symposium, IWS 2013 - Beijing, China Duration: 14 Apr 2013 → 18 Apr 2013

Conference

Conference	2013 IEEE International Wireless Symposium, IWS 2013
Place	China
City	Beijing
Period	14/04/13 → 18/04/13

Research Keywords

180° hybrid
Differential power amplifier
Doherty amplifier
load modulation network
power-added efficiency (PAE)

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@inproceedings{874a84d864234ea182171da9e8a02487,

title = "A compact fully differential Doherty power amplifier",

abstract = "In this paper, a compact triple-transistor fully differential Doherty power amplifier (DPA) is investigated. Three active devices are combined in a very judicious way to amplify the differential signal in a way like what a typical Doherty amplifier does. Particularly, two out-of-phase carrier PAs are applied to operate in the low-power region for high efficiency. On the other hand, only one peaking PA is used in the high-power region, which shares its output evenly with the two carriers. The reduction of transistor number from four for a classic differential DPA to three greatly cuts down the realization cost and compacts the overall circuit. Theoretical analysis is given for deep understanding of the operation principle. To demonstrate the proposed technique, a prototype is implemented based on Cree's CGH40010 GaN HEMTs. Experimental result shows that 73\% and 63\% drain efficiencies are achieved at peak power and 6-dB back-off point, respectively. {\textcopyright} 2013 IEEE.",

keywords = "180° hybrid, Differential power amplifier, Doherty amplifier, load modulation network, power-added efficiency (PAE)",

author = "Shichang Chen and Quan Xue",

year = "2013",

doi = "10.1109/IEEE-IWS.2013.6616784",

language = "English",

isbn = "9781467321419",

booktitle = "2013 IEEE International Wireless Symposium, IWS 2013",

note = "2013 IEEE International Wireless Symposium, IWS 2013 ; Conference date: 14-04-2013 Through 18-04-2013",

}

TY - GEN

T1 - A compact fully differential Doherty power amplifier

AU - Chen, Shichang

AU - Xue, Quan

PY - 2013

Y1 - 2013

N2 - In this paper, a compact triple-transistor fully differential Doherty power amplifier (DPA) is investigated. Three active devices are combined in a very judicious way to amplify the differential signal in a way like what a typical Doherty amplifier does. Particularly, two out-of-phase carrier PAs are applied to operate in the low-power region for high efficiency. On the other hand, only one peaking PA is used in the high-power region, which shares its output evenly with the two carriers. The reduction of transistor number from four for a classic differential DPA to three greatly cuts down the realization cost and compacts the overall circuit. Theoretical analysis is given for deep understanding of the operation principle. To demonstrate the proposed technique, a prototype is implemented based on Cree's CGH40010 GaN HEMTs. Experimental result shows that 73% and 63% drain efficiencies are achieved at peak power and 6-dB back-off point, respectively. © 2013 IEEE.

AB - In this paper, a compact triple-transistor fully differential Doherty power amplifier (DPA) is investigated. Three active devices are combined in a very judicious way to amplify the differential signal in a way like what a typical Doherty amplifier does. Particularly, two out-of-phase carrier PAs are applied to operate in the low-power region for high efficiency. On the other hand, only one peaking PA is used in the high-power region, which shares its output evenly with the two carriers. The reduction of transistor number from four for a classic differential DPA to three greatly cuts down the realization cost and compacts the overall circuit. Theoretical analysis is given for deep understanding of the operation principle. To demonstrate the proposed technique, a prototype is implemented based on Cree's CGH40010 GaN HEMTs. Experimental result shows that 73% and 63% drain efficiencies are achieved at peak power and 6-dB back-off point, respectively. © 2013 IEEE.

KW - 180° hybrid

KW - Differential power amplifier

KW - Doherty amplifier

KW - load modulation network

KW - power-added efficiency (PAE)

UR - https://www.scopus.com/pages/publications/84886862231

UR - https://www.scopus.com/pages/publications/84886862231#tab=impact

U2 - 10.1109/IEEE-IWS.2013.6616784

DO - 10.1109/IEEE-IWS.2013.6616784

M3 - RGC 32 - Refereed conference paper (with host publication)

SN - 9781467321419

BT - 2013 IEEE International Wireless Symposium, IWS 2013

T2 - 2013 IEEE International Wireless Symposium, IWS 2013

Y2 - 14 April 2013 through 18 April 2013

ER -

A compact fully differential Doherty power amplifier

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