Linearization of a 3.7 GHz multi-carrier GaN HEMT Doherty power amplifier using digital predistortion method

Jonghyuk Jeong; Juho Van; Jaeyong Cho; Min Su Kim; Hanjin Cho; Kyung Hoon Lim; Sung Wook Kwon; Kyonggon Choi; Hyung Chul Kim; Sungcheol Yoo; Cheon Seok Park; Youngoo Yang

doi:10.1002/mop.24984

Linearization of a 3.7 GHz multi-carrier GaN HEMT Doherty power amplifier using digital predistortion method

Jonghyuk Jeong, Juho Van, Jaeyong Cho, Min Su Kim, Hanjin Cho, Kyung Hoon Lim, Sung Wook Kwon, Kyonggon Choi, Hyung Chul Kim, Sungcheol Yoo, Cheon Seok Park, Youngoo Yang

Department of Electronic and Electrical Engineering

Sungkyunkwan University

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

In this article, a 3.7 GHz band Doherty amplifier based on GaN HEMTs, which is linearized using a digital predistortion method, is implemented for 4th generation wireless communication systems. The forward and reverse models of the Doherty amplifier for the predistortion consist of simple polynomials whose coefficients are extracted using a conventional least mean square error algorithm. Using a two carrier signal based on IEEE802.16e, whose PAR is 9.44 dB, an ACLR improvement of 10.74 dB is achieved to give an ACLR level of 41.74 dBc at an offset of 4.79 MHz. The overall efficiency of the Doherty power amplifier is 13.74%, which represents a 2.44% improvement compared with that of a balanced class-AB power amplifier at an average output power of 36 dBm.

Original language	English
Pages (from-to)	634-638
Number of pages	5
Journal	Microwave and Optical Technology Letters
Volume	52
Issue number	3
DOIs	https://doi.org/10.1002/mop.24984
State	Published - Mar 2010

Keywords

Digital predistortion
Doherty amplifier
GaN HEMT
Linearization
Power amplifier

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10.1002/mop.24984

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title = "Linearization of a 3.7 GHz multi-carrier GaN HEMT Doherty power amplifier using digital predistortion method",

abstract = "In this article, a 3.7 GHz band Doherty amplifier based on GaN HEMTs, which is linearized using a digital predistortion method, is implemented for 4th generation wireless communication systems. The forward and reverse models of the Doherty amplifier for the predistortion consist of simple polynomials whose coefficients are extracted using a conventional least mean square error algorithm. Using a two carrier signal based on IEEE802.16e, whose PAR is 9.44 dB, an ACLR improvement of 10.74 dB is achieved to give an ACLR level of 41.74 dBc at an offset of 4.79 MHz. The overall efficiency of the Doherty power amplifier is 13.74\%, which represents a 2.44\% improvement compared with that of a balanced class-AB power amplifier at an average output power of 36 dBm.",

keywords = "Digital predistortion, Doherty amplifier, GaN HEMT, Linearization, Power amplifier",

author = "Jonghyuk Jeong and Juho Van and Jaeyong Cho and Kim, \{Min Su\} and Hanjin Cho and Lim, \{Kyung Hoon\} and Kwon, \{Sung Wook\} and Kyonggon Choi and Kim, \{Hyung Chul\} and Sungcheol Yoo and Park, \{Cheon Seok\} and Youngoo Yang",

year = "2010",

month = mar,

doi = "10.1002/mop.24984",

language = "English",

volume = "52",

pages = "634--638",

journal = "Microwave and Optical Technology Letters",

issn = "0895-2477",

publisher = "John Wiley \& Sons Inc.",

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TY - JOUR

T1 - Linearization of a 3.7 GHz multi-carrier GaN HEMT Doherty power amplifier using digital predistortion method

AU - Jeong, Jonghyuk

AU - Van, Juho

AU - Cho, Jaeyong

AU - Kim, Min Su

AU - Cho, Hanjin

AU - Lim, Kyung Hoon

AU - Kwon, Sung Wook

AU - Choi, Kyonggon

AU - Kim, Hyung Chul

AU - Yoo, Sungcheol

AU - Park, Cheon Seok

AU - Yang, Youngoo

PY - 2010/3

Y1 - 2010/3

N2 - In this article, a 3.7 GHz band Doherty amplifier based on GaN HEMTs, which is linearized using a digital predistortion method, is implemented for 4th generation wireless communication systems. The forward and reverse models of the Doherty amplifier for the predistortion consist of simple polynomials whose coefficients are extracted using a conventional least mean square error algorithm. Using a two carrier signal based on IEEE802.16e, whose PAR is 9.44 dB, an ACLR improvement of 10.74 dB is achieved to give an ACLR level of 41.74 dBc at an offset of 4.79 MHz. The overall efficiency of the Doherty power amplifier is 13.74%, which represents a 2.44% improvement compared with that of a balanced class-AB power amplifier at an average output power of 36 dBm.

AB - In this article, a 3.7 GHz band Doherty amplifier based on GaN HEMTs, which is linearized using a digital predistortion method, is implemented for 4th generation wireless communication systems. The forward and reverse models of the Doherty amplifier for the predistortion consist of simple polynomials whose coefficients are extracted using a conventional least mean square error algorithm. Using a two carrier signal based on IEEE802.16e, whose PAR is 9.44 dB, an ACLR improvement of 10.74 dB is achieved to give an ACLR level of 41.74 dBc at an offset of 4.79 MHz. The overall efficiency of the Doherty power amplifier is 13.74%, which represents a 2.44% improvement compared with that of a balanced class-AB power amplifier at an average output power of 36 dBm.

KW - Digital predistortion

KW - Doherty amplifier

KW - GaN HEMT

KW - Linearization

KW - Power amplifier

UR - https://www.scopus.com/pages/publications/74849095806

U2 - 10.1002/mop.24984

DO - 10.1002/mop.24984

M3 - Article

AN - SCOPUS:74849095806

SN - 0895-2477

VL - 52

SP - 634

EP - 638

JO - Microwave and Optical Technology Letters

JF - Microwave and Optical Technology Letters

IS - 3

ER -

Linearization of a 3.7 GHz multi-carrier GaN HEMT Doherty power amplifier using digital predistortion method

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Keywords

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