Design of a high-efficiency and high-power inverted Doherty amplifier

Gunhyun Ahn; Min Su Kim; Hyun Chul Park; Sung Chan Jung; Ju Ho Van; Hanjin Cho; Sung Wook Kwon; Jong Hyuk Jeong; Kyung Hoon Lim; Jae Young Kim; Sung Chan Song; Cheon Seok Park; Youngoo Yang

doi:10.1109/TMTT.2007.896807

Design of a high-efficiency and high-power inverted Doherty amplifier

Gunhyun Ahn, Min Su Kim, Hyun Chul Park, Sung Chan Jung, Ju Ho Van, Hanjin Cho, Sung Wook Kwon, Jong Hyuk Jeong, Kyung Hoon Lim, Jae Young Kim, Sung Chan Song, Cheon Seok Park, Youngoo Yang

Department of Electronic and Electrical Engineering

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

60 Scopus citations

Abstract

In this paper, we present a design method for a compact inverted Doherty power amplifier (IDPA), which has high-efficiency and high-power characteristics. An optimum load matching network and an additional offset line, after the matching network of the carrier amplifier, dynamically modulate the load impedance according to the input power drive, while the conventional Doherty power amplifier uses a quarter-wave line to do it. The operational principles and design guide are provided. For experimental verification, a 50-W Doherty amplifier was designed for the π/4 differential quadrature phase-shift keying application at the 860-MHz band. The measured performance of the IDPA was compared with that of the balanced class-AB amplifier with the same output matching network. At an output power of 50 W, the IDPA performs with 3.16 dB better adjacent channel power ratio (-28 versus -24.84 dBc) and 6.15% higher power-added efficiency (59.02 versus 52.87%) than the class-AB amplifier does.

Original language	English
Pages (from-to)	1105-1110
Number of pages	6
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	55
Issue number	6
DOIs	https://doi.org/10.1109/TMTT.2007.896807
State	Published - Jun 2007

Keywords

π/4 differential quadrature phase-shift keying (DQPSK)
Doherty power amplifier
Inverted Doherty power amplifier (IDFA)
Load modulation
Offset line

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10.1109/TMTT.2007.896807

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title = "Design of a high-efficiency and high-power inverted Doherty amplifier",

abstract = "In this paper, we present a design method for a compact inverted Doherty power amplifier (IDPA), which has high-efficiency and high-power characteristics. An optimum load matching network and an additional offset line, after the matching network of the carrier amplifier, dynamically modulate the load impedance according to the input power drive, while the conventional Doherty power amplifier uses a quarter-wave line to do it. The operational principles and design guide are provided. For experimental verification, a 50-W Doherty amplifier was designed for the π/4 differential quadrature phase-shift keying application at the 860-MHz band. The measured performance of the IDPA was compared with that of the balanced class-AB amplifier with the same output matching network. At an output power of 50 W, the IDPA performs with 3.16 dB better adjacent channel power ratio (-28 versus -24.84 dBc) and 6.15\% higher power-added efficiency (59.02 versus 52.87\%) than the class-AB amplifier does.",

keywords = "π/4 differential quadrature phase-shift keying (DQPSK), Doherty power amplifier, Inverted Doherty power amplifier (IDFA), Load modulation, Offset line",

author = "Gunhyun Ahn and Kim, \{Min Su\} and Park, \{Hyun Chul\} and Jung, \{Sung Chan\} and Van, \{Ju Ho\} and Hanjin Cho and Kwon, \{Sung Wook\} and Jeong, \{Jong Hyuk\} and Lim, \{Kyung Hoon\} and Kim, \{Jae Young\} and Song, \{Sung Chan\} and Park, \{Cheon Seok\} and Youngoo Yang",

year = "2007",

month = jun,

doi = "10.1109/TMTT.2007.896807",

language = "English",

volume = "55",

pages = "1105--1110",

journal = "IEEE Transactions on Microwave Theory and Techniques",

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T1 - Design of a high-efficiency and high-power inverted Doherty amplifier

AU - Ahn, Gunhyun

AU - Kim, Min Su

AU - Park, Hyun Chul

AU - Jung, Sung Chan

AU - Van, Ju Ho

AU - Cho, Hanjin

AU - Kwon, Sung Wook

AU - Jeong, Jong Hyuk

AU - Lim, Kyung Hoon

AU - Kim, Jae Young

AU - Song, Sung Chan

AU - Park, Cheon Seok

AU - Yang, Youngoo

PY - 2007/6

Y1 - 2007/6

N2 - In this paper, we present a design method for a compact inverted Doherty power amplifier (IDPA), which has high-efficiency and high-power characteristics. An optimum load matching network and an additional offset line, after the matching network of the carrier amplifier, dynamically modulate the load impedance according to the input power drive, while the conventional Doherty power amplifier uses a quarter-wave line to do it. The operational principles and design guide are provided. For experimental verification, a 50-W Doherty amplifier was designed for the π/4 differential quadrature phase-shift keying application at the 860-MHz band. The measured performance of the IDPA was compared with that of the balanced class-AB amplifier with the same output matching network. At an output power of 50 W, the IDPA performs with 3.16 dB better adjacent channel power ratio (-28 versus -24.84 dBc) and 6.15% higher power-added efficiency (59.02 versus 52.87%) than the class-AB amplifier does.

AB - In this paper, we present a design method for a compact inverted Doherty power amplifier (IDPA), which has high-efficiency and high-power characteristics. An optimum load matching network and an additional offset line, after the matching network of the carrier amplifier, dynamically modulate the load impedance according to the input power drive, while the conventional Doherty power amplifier uses a quarter-wave line to do it. The operational principles and design guide are provided. For experimental verification, a 50-W Doherty amplifier was designed for the π/4 differential quadrature phase-shift keying application at the 860-MHz band. The measured performance of the IDPA was compared with that of the balanced class-AB amplifier with the same output matching network. At an output power of 50 W, the IDPA performs with 3.16 dB better adjacent channel power ratio (-28 versus -24.84 dBc) and 6.15% higher power-added efficiency (59.02 versus 52.87%) than the class-AB amplifier does.

KW - π/4 differential quadrature phase-shift keying (DQPSK)

KW - Doherty power amplifier

KW - Inverted Doherty power amplifier (IDFA)

KW - Load modulation

KW - Offset line

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DO - 10.1109/TMTT.2007.896807

M3 - Article

AN - SCOPUS:34250191839

SN - 0018-9480

VL - 55

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JO - IEEE Transactions on Microwave Theory and Techniques

JF - IEEE Transactions on Microwave Theory and Techniques

IS - 6

ER -

Design of a high-efficiency and high-power inverted Doherty amplifier

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Keywords

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