scholarly journals A Review of Efficiency Improvement Techniques in Modern Communication Systems

2021 ◽  
Vol 23 (07) ◽  
pp. 656-658
Author(s):  
Peddi Saurabh ◽  
◽  
Poornima Asuti ◽  
Prof. Deepika P ◽  
◽  
...  
Keyword(s):  
Power Amplifier ◽  
Communication Systems ◽  
Research Trends ◽  
Efficiency Improvement ◽  
Operational Principle ◽  
Doherty Power Amplifier ◽  
Doherty Amplifier

This paper discusses Doherty Power Amplifier(DPA) and its evolution over the years. The basic operational principle of the Doherty amplifier and its defective behavior that has been originated by transistor characteristics will be presented. The different research trends, all aimed to improve the advantages of the Doherty scheme and to solve its inherent drawbacks, are discussed.

scholarly journals High efficiency Doherty power amplifier based on asymmetrical matching network

2021 ◽  
Vol 23 (2) ◽  
pp. 910
Author(s):  
Mussa Mabrok ◽  
Zahriladha Zakaria ◽  
Tole Sutikno
Keyword(s):  
Output Power ◽  
Power Amplifier ◽  
Communication Systems ◽  
High Efficiency ◽  
Design Strategy ◽  
Matching Network ◽  
High Data ◽  
Fifth Generation ◽  
Data Rates ◽  
Doherty Power Amplifier

Doherty power amplifier (DPA) with high efficiency at the output power back off is highly demanded for modern wireless communication systems to achieve high data rates and reduce the power consumption and operation costs. This paper presents a new design strategy for enhancing DPA’s back-off efficiency. New design strategy called asymmetrical matching network is used to achieve asymmetric operation, which helps to compensate for the low power delivered by the peaking stage in the conventional DPA. The simulation results showed an enhancement in the back-off efficiency, where the proposed design is able toachieve 46-52% drain efficiency at 8 dB output power back-off while maintains high efficiency of 73-80 % at saturation over the designed bandwidth of 3.4-3.6 GHz. The proposed design is suitable for high efficiency sub-6 GHz fifth-generation wireless applications.<br /><div> </div>

A planner Doherty power amplifier with harmonic suppression with open and short ended stubs

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Saeedeh Lotfi ◽  
Saeed Roshani ◽  
Sobhan Roshani ◽  
Maryam Shirzadian Gilan
Keyword(s):  
Power Amplifier ◽  
Power Divider ◽  
Harmonic Suppression ◽  
Power Added Efficiency ◽  
Main Amplifier ◽  
Inverse Topology ◽  
Doherty Power Amplifier ◽  
Amplifier Design ◽  
Doherty Amplifier ◽  
Class F

Abstract This paper presents a new Doherty power amplifier (DPA) with harmonics suppression. A Wilkinson power divider (WPD) with open-ended and short-ended stubs is designed to suppress unwanted signals. To design the power divider in the circuit of the DPA, even and odd mode analyses are utilized. The proposed design operates at range of 1.2–1.6 GHz. The linearity of the suggested DPA is increased about 6 dBm, in comparison with the main amplifier. The designed Doherty amplifier has a power added efficiency (PAE), drain efficiency (DE) and Gain about 60, 61% and 19 dB, respectively. The designed WPD suppresses 2nd up to 14th harmonics with more than 20 dB suppression level, which is useful for suppressing unwanted harmonics in DPA design. ATF-34143 transistors (pHEMT technology) are used for this DPA amplifier design. The main amplifier has class-F topology and class-F inverse topology is used for auxiliary amplifier.

scholarly journals Application of New Matching Technique in Doherty Amplifier

2013 ◽  
Vol 278-280 ◽  
pp. 1091-1094
Author(s):  
Jun Chen ◽  
Guo Qing Shen ◽  
Kai Xiong Su
Keyword(s):  
Low Power ◽  
Power Amplifier ◽  
Computer Software ◽  
High Linearity ◽  
Matching Technique ◽  
Power Operation ◽  
Doherty Power Amplifier ◽  
Doherty Amplifier

According to the shortage of the traditional offset line in Doherty power amplifier, a new offset line technique is proposed to match carrier amplifier with the load and to improve the performance of the Doherty amplifier. By simulation of the computer software, a higher efficiency is obtained using the new offset line comparing the two kinds of offset lines. The new offset line matching technique could be applied in the system with high linearity and low power operation.

scholarly journals Design of a broadband high-efficiency Doherty power amplifier for 5G communication systems

2019 ◽  
Vol 16 (14) ◽  
pp. 20190371-20190371 ◽  
Author(s):  
Zhiwei Zhang ◽  
Zhiqun Cheng ◽  
Guohua Liu ◽  
Zhendong Zhang ◽  
Yong Cai
Keyword(s):  
Power Amplifier ◽  
Communication Systems ◽  
High Efficiency ◽  
Doherty Power Amplifier ◽  
5G Communication

Design of a Tri-Band Doherty Amplifier Based on Generalized Impedance Inverter

2019 ◽  
Vol 28 (10) ◽  
pp. 1950170 ◽  
Author(s):  
Weimin Shi ◽  
Songbai He
Keyword(s):  
Power Amplifier ◽  
Power Amplifiers ◽  
Average Power ◽  
Measurement Results ◽  
Adjacent Channel ◽  
Before And After ◽  
Working Frequency ◽  
Doherty Power Amplifier ◽  
Doherty Amplifier ◽  
Multi Band

This paper introduces a methodology for implementing multi-band Doherty power amplifiers. Traditionally, a 90∘ impedance inverter line is required in Doherty architecture. In this contribution, a generalized impedance inverter line is utilized to construct multi-band Doherty power amplifiers. A tri-band Doherty power amplifier operating at 1.15, 1.85 and 2.55[Formula: see text]GHz is designed to validate the proposed method. Measurement results show the fabricated Doherty power amplifier achieves 6[Formula: see text]dB output back-off drain efficiencies of 62.3%, 49.3% and 50.5% at 1.15, 1.85 and 2.55[Formula: see text]GHz, respectively. The peaking output power of the fabricated tri-band Doherty power amplifier is 43.2, 43.7 and 43.8[Formula: see text]dBm with drain efficiencies of 64.5%, 62.2% and 64.5% at three working frequency points, respectively. Furthermore, when the designed Doherty power amplifier is driven by a 20[Formula: see text]MHz wideband LTE signal with peak-to-average-power ratio of 6.4[Formula: see text]dB, adjacent channel power ratios of [Formula: see text]29.4 and [Formula: see text]57.1[Formula: see text]dBc are achieved before and after digital pre-distortion at 1.85[Formula: see text]GHz.

Inverted asymmetric Doherty power amplifier driven by two-stage symmetric Doherty amplifier

2010 ◽  
Vol 46 (17) ◽  
pp. 1208 ◽  
Author(s):  
S.H. Chun ◽  
D.H. Jang ◽  
J.Y. Kim ◽  
J.H. Kim
Keyword(s):  
Power Amplifier ◽  
Two Stage ◽  
Doherty Power Amplifier ◽  
Doherty Amplifier
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