A 5.5-GHZ sige HBT Doherty amplifier using diode linearizer and lumped-element hybrid coupler

Haiwen Liu; Toshihiko Yoshimasu

doi:10.1002/mop.23432

A 5.5-GHZ sige HBT Doherty amplifier using diode linearizer and lumped-element hybrid coupler

Haiwen Liu^*, Toshihiko Yoshimasu

^*Corresponding author for this work

Graduate School of Information, Production and Systems

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

3 Citations (Scopus)

Abstract

A 5.5-GHz Doherty amplifier using commercial 0.35-μm SiGe HBT technology is proposed in this article. To improve the linearity, a predistortion using diode linearizer is adopted for biasing the peak amplifier. Moreover, to realize in fully on-chip with circuit reduction, a 90° 3-dB hybrid coupler and quarter-wave transmission lines are implemented by lumped-elements. In this design, 819 μm² HBTs are used for carried and peak amplifiers, respectively, and 26 μm² HBT is used for linearizer. Results verify that the power gain, P_1dB, and power added efficiency (PAE) of the proposed Doherty amplifier at 5.5 GHz are 8.4 dB, 31 dBm, and 30%, respectively. Also, the adjacent channel power ratio (ACPR) and the output signal's spectrum mask are given using the 54Mcps 64QAM modulated signal at 10 MHz offset.

Original language	English
Pages (from-to)	1554-1558
Number of pages	5
Journal	Microwave and Optical Technology Letters
Volume	50
Issue number	6
DOIs	https://doi.org/10.1002/mop.23432
Publication status	Published - 2008 Jun 1

Keywords

Diode linearizer
Doherty amplifier
Lumped-element coupler
SiGe HBT

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1002/mop.23432

Cite this

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title = "A 5.5-GHZ sige HBT Doherty amplifier using diode linearizer and lumped-element hybrid coupler",

abstract = "A 5.5-GHz Doherty amplifier using commercial 0.35-μm SiGe HBT technology is proposed in this article. To improve the linearity, a predistortion using diode linearizer is adopted for biasing the peak amplifier. Moreover, to realize in fully on-chip with circuit reduction, a 90° 3-dB hybrid coupler and quarter-wave transmission lines are implemented by lumped-elements. In this design, 819 μm2 HBTs are used for carried and peak amplifiers, respectively, and 26 μm2 HBT is used for linearizer. Results verify that the power gain, P1dB, and power added efficiency (PAE) of the proposed Doherty amplifier at 5.5 GHz are 8.4 dB, 31 dBm, and 30%, respectively. Also, the adjacent channel power ratio (ACPR) and the output signal's spectrum mask are given using the 54Mcps 64QAM modulated signal at 10 MHz offset.",

keywords = "Diode linearizer, Doherty amplifier, Lumped-element coupler, SiGe HBT",

author = "Haiwen Liu and Toshihiko Yoshimasu",

year = "2008",

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T1 - A 5.5-GHZ sige HBT Doherty amplifier using diode linearizer and lumped-element hybrid coupler

AU - Liu, Haiwen

AU - Yoshimasu, Toshihiko

PY - 2008/6/1

Y1 - 2008/6/1

N2 - A 5.5-GHz Doherty amplifier using commercial 0.35-μm SiGe HBT technology is proposed in this article. To improve the linearity, a predistortion using diode linearizer is adopted for biasing the peak amplifier. Moreover, to realize in fully on-chip with circuit reduction, a 90° 3-dB hybrid coupler and quarter-wave transmission lines are implemented by lumped-elements. In this design, 819 μm2 HBTs are used for carried and peak amplifiers, respectively, and 26 μm2 HBT is used for linearizer. Results verify that the power gain, P1dB, and power added efficiency (PAE) of the proposed Doherty amplifier at 5.5 GHz are 8.4 dB, 31 dBm, and 30%, respectively. Also, the adjacent channel power ratio (ACPR) and the output signal's spectrum mask are given using the 54Mcps 64QAM modulated signal at 10 MHz offset.

AB - A 5.5-GHz Doherty amplifier using commercial 0.35-μm SiGe HBT technology is proposed in this article. To improve the linearity, a predistortion using diode linearizer is adopted for biasing the peak amplifier. Moreover, to realize in fully on-chip with circuit reduction, a 90° 3-dB hybrid coupler and quarter-wave transmission lines are implemented by lumped-elements. In this design, 819 μm2 HBTs are used for carried and peak amplifiers, respectively, and 26 μm2 HBT is used for linearizer. Results verify that the power gain, P1dB, and power added efficiency (PAE) of the proposed Doherty amplifier at 5.5 GHz are 8.4 dB, 31 dBm, and 30%, respectively. Also, the adjacent channel power ratio (ACPR) and the output signal's spectrum mask are given using the 54Mcps 64QAM modulated signal at 10 MHz offset.

KW - Diode linearizer

KW - Doherty amplifier

KW - Lumped-element coupler

KW - SiGe HBT

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A 5.5-GHZ sige HBT Doherty amplifier using diode linearizer and lumped-element hybrid coupler

Abstract

Keywords

ASJC Scopus subject areas

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