A Low Distortion and High Efficiency Paralleled Power Amplifier without an Isolator in Wide Range of Load Impedances
Summary :
Characteristics of a distortion, gain and efficiency of a power amplifier grow worse extremely by different phases of the load reflection coefficient when load impedances of the power amplifier are far from 50 Ω. It was found that the value of the distortion, gain and efficiency showed the tradeoff behavior when the phase of the reflection coefficient was different in 180 degrees. Therefore we have proposed new two- and four-parallel unit power amplifiers combined in 90 degree and 45 degree different phases each in order to accomplish low distortion and high efficiency in wide range of load impedances without an isolator. We studied the power amplifiers by simulation based on experiments and realized an amplifier in that adjacent channel leakage power of π/4-DQPSK modulation (for Japan's digital cellular system) is less than -45 dBc and efficiency is over 45% in range of load VSWR less than 3.
- Publication
- IEICE TRANSACTIONS on Electronics Vol.E80-C No.6 pp.763-767
- Publication Date
- 1997/06/25
- Publicized
- Online ISSN
- DOI
- Type of Manuscript
- Special Section PAPER (Special Issue on Microwave and Millimeterwave High-power Devices)
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Hikaru IKEDA, Hiroaki KOSUGI, Tomoki UWANO, "A Low Distortion and High Efficiency Paralleled Power Amplifier without an Isolator in Wide Range of Load Impedances" in IEICE TRANSACTIONS on Electronics,
vol. E80-C, no. 6, pp. 763-767, June 1997, doi: .
Abstract: Characteristics of a distortion, gain and efficiency of a power amplifier grow worse extremely by different phases of the load reflection coefficient when load impedances of the power amplifier are far from 50 Ω. It was found that the value of the distortion, gain and efficiency showed the tradeoff behavior when the phase of the reflection coefficient was different in 180 degrees. Therefore we have proposed new two- and four-parallel unit power amplifiers combined in 90 degree and 45 degree different phases each in order to accomplish low distortion and high efficiency in wide range of load impedances without an isolator. We studied the power amplifiers by simulation based on experiments and realized an amplifier in that adjacent channel leakage power of π/4-DQPSK modulation (for Japan's digital cellular system) is less than -45 dBc and efficiency is over 45% in range of load VSWR less than 3.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e80-c_6_763/_p
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@ARTICLE{e80-c_6_763,
author={Hikaru IKEDA, Hiroaki KOSUGI, Tomoki UWANO, },
journal={IEICE TRANSACTIONS on Electronics},
title={A Low Distortion and High Efficiency Paralleled Power Amplifier without an Isolator in Wide Range of Load Impedances},
year={1997},
volume={E80-C},
number={6},
pages={763-767},
abstract={Characteristics of a distortion, gain and efficiency of a power amplifier grow worse extremely by different phases of the load reflection coefficient when load impedances of the power amplifier are far from 50 Ω. It was found that the value of the distortion, gain and efficiency showed the tradeoff behavior when the phase of the reflection coefficient was different in 180 degrees. Therefore we have proposed new two- and four-parallel unit power amplifiers combined in 90 degree and 45 degree different phases each in order to accomplish low distortion and high efficiency in wide range of load impedances without an isolator. We studied the power amplifiers by simulation based on experiments and realized an amplifier in that adjacent channel leakage power of π/4-DQPSK modulation (for Japan's digital cellular system) is less than -45 dBc and efficiency is over 45% in range of load VSWR less than 3.},
keywords={},
doi={},
ISSN={},
month={June},}
Copy
TY - JOUR
TI - A Low Distortion and High Efficiency Paralleled Power Amplifier without an Isolator in Wide Range of Load Impedances
T2 - IEICE TRANSACTIONS on Electronics
SP - 763
EP - 767
AU - Hikaru IKEDA
AU - Hiroaki KOSUGI
AU - Tomoki UWANO
PY - 1997
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E80-C
IS - 6
JA - IEICE TRANSACTIONS on Electronics
Y1 - June 1997
AB - Characteristics of a distortion, gain and efficiency of a power amplifier grow worse extremely by different phases of the load reflection coefficient when load impedances of the power amplifier are far from 50 Ω. It was found that the value of the distortion, gain and efficiency showed the tradeoff behavior when the phase of the reflection coefficient was different in 180 degrees. Therefore we have proposed new two- and four-parallel unit power amplifiers combined in 90 degree and 45 degree different phases each in order to accomplish low distortion and high efficiency in wide range of load impedances without an isolator. We studied the power amplifiers by simulation based on experiments and realized an amplifier in that adjacent channel leakage power of π/4-DQPSK modulation (for Japan's digital cellular system) is less than -45 dBc and efficiency is over 45% in range of load VSWR less than 3.
ER -
English
