scholarly journals Highly efficient 3-stage Doherty power amplifier using gate bias adaption

2010 ◽  
Vol 3 (1) ◽  
pp. 47-58 ◽  
Author(s):  
Ildu Kim ◽  
Junghwan Moon ◽  
Jungjoon Kim ◽  
Seunghoon Jee ◽  
Junghwan Son ◽  
...  
Keyword(s):  
Output Power ◽  
Power Amplifier ◽  
Peak Power ◽  
Average Power ◽  
Maximum Efficiency ◽  
System Specification ◽  
Average Output ◽  
Highly Efficient ◽  
Doherty Power Amplifier ◽  
Power Region

This paper demonstrates a highly efficient 3-stage Doherty power amplifier (PA) employing an envelope tracking (ET) technique. The ‘3-stage’ Doherty PA is the most efficient architecture for a high peak-to-average power ratio (PAPR) signal among the various Doherty PAs. However, because of the lower peaking biases than those of the ‘N-way’ Doherty PA, the proper load modulation is hard to be achieved. To get proper modulation, the peaking PAs' gate biases have been adaptively controlled using the ET technique, and the peak power and maximum efficiency characteristic along the backed-off output power region is successfully achieved. By ADS and Matlab simulations, the overall behavior of the 3-stage Doherty PA employing the ET technique has been fully analyzed. To maximize the overall efficiency of the proposed 3-stage Doherty PA, the unit PA has been designed using class F−1 PA. For verification, the amplifier is implemented using 5 W and 10 W PEP LDMOSFETs for the 802.16e mobile world interoperability for microwave access (WiMAX) at 1 GHz with a 8.5 dB PAPR. The measured drain efficiency of the proposed 3-stage Doherty PA is 55.5% at an average output power of 37 dBm, which is a 7.54 dB backed-off output power. The digital feedback predistortion (DFBPD) algorithm has been used to linearize the proposed PA considering the ET technique. After linearization, the −33.15 dB of relative constellation error (RCE) performance is achieved, satisfying the system specification. These results show that the 3-stage Doherty employing the ET technique and saturated PA is the most suitable PA for the highly efficient and linear transmitter.

A 2.5GHZ-2.7GHz Unsymmetrical Doherty Power Amplifier with Digital Predistortion for LTE-Advanced Applications

2013 ◽  
Vol 760-762 ◽  
pp. 546-550 ◽  
Author(s):  
Wen Sheng Pan ◽  
Chuan Hui Ma ◽  
Shi Hai Shao ◽  
You Xi Tang
Keyword(s):  
Output Power ◽  
Power Amplifier ◽  
Power Efficiency ◽  
Continuous Wave ◽  
Digital Predistortion ◽  
Average Output ◽  
Lte Advanced ◽  
Saturation Power ◽  
Doherty Power Amplifier ◽  
Better Than

An unsymmetrical GaN based Doherty power amplifier (DPA) operating from 2.5GHz to 2.7GHz is presented in this paper. To achieve a good tradeoff among the output power, efficiency and bandwidth, the ladder-type multisection output matching networks are optimized for the carrier amplifier and the peaking amplifier, respectively. Measured with continuous wave (CW) signal, the broadband DPA provides more than 49dBm saturation power in the operating band. The drain efficiency is greater than 44% over 7dB back-off power. For a LTE-Advanced signal with 100MHz bandwidth, the drain efficiency is higher than 42% at an average output power of 41dBm, along with an adjacent channel leakage ratio (ACLR) of better than-49.9dBc after digital predistortion (DPD).

Design of Unsymmetrical Doherty Power Amplifier for 460MHz LTE-Advanced Applications

2013 ◽  
Vol 347-350 ◽  
pp. 1768-1772
Author(s):  
Chuan Hui Ma ◽  
Wen Sheng Pan ◽  
You Xi Tang ◽  
Chao Jin Qing
Keyword(s):  
Output Power ◽  
Power Amplifier ◽  
Continuous Wave ◽  
Average Output ◽  
Term Evolution ◽  
Lte Advanced ◽  
Adjacent Channel ◽  
Before And After ◽  
Doherty Power Amplifier

An unsymmetrical Doherty power amplifier (DPA) at 460MHz is presented in this paper. The carrier and peaking amplifier of the DPA, which base on two equal-sized devices, are matched with different networks to mitigate the performance degradation caused by the limited load modulation. Measured with continuous wave (CW), the unsymmetrical DPA saturates at an output power of 49.2dBm and achieves a drain efficiency of 51% at 6dB back-off. Using a one-carrier long term evolution advanced (LTE-Advanced) signal with 20MHz bandwidth, the unsymmetrical DPA exhibits a drain efficiency of 48.7% at an average output power of 42.1dBm, along with adjacent channel leakage ratio (ACLR) of-34.1dBc and-53.3dBc before and after digital pre-distortion (DPD), respectively.

scholarly journals Design and simulate a doherty power amplifier using GaAs technology for telecommunication applications

2019 ◽  
Vol 15 (2) ◽  
pp. 845
Author(s):  
Ehsan Barmala
Keyword(s):  
Output Power ◽  
Power Amplifier ◽  
Power Amplifiers ◽  
High Efficiency ◽  
Maximum Output Power ◽  
Input Power ◽  
Power Divider ◽  
Maximum Efficiency ◽  
Maximum Output ◽  
Doherty Power Amplifier

<span>In this paper, a Doherty power amplifier was designed and simulated at 2.4 GHz central frequency which has high efficiency. A Doherty power amplifier is a way to increase the efficiency in the power amplifiers. OMMIC ED02AH technology and PHEMT transistors, which is made of gallium arsenide, have been used in this simulation. The Doherty power amplifier unique feature is its simple structure which is consisting of two parallel power amplifiers and transmission lines. In order to integrate the circuit, the Doherty power transmission amplifier lines were implemented using an inductor and capacitive components. Also, the Wilkinson power divider is used on the chip input. To improve the efficiency, the auxiliary amplifier dimensions is selected enlarge and the further input power is allocated it by the power divider. A parallel R-C circuit has been used at the input of transistors to improve their stability. Simulation results show that the Doherty power amplifier has 17.2 dB output power gain, 23 dBm maximum output power, and its output power P<sub>1dB</sub> =22.6dBm at compression point -1 dB, also, its maximum efficiency is 55.5%.</span>

scholarly journals Picosecond Yb-doped tapered fiber laser system with 1.26 MW peak power and 200 W average output power

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Andrey Petrov ◽  
Maxim Odnoblyudov ◽  
Regina Gumenyuk ◽  
Lidiya Minyonok ◽  
Andrey Chumachenko ◽  
...  
Keyword(s):  
Output Power ◽  
Power Amplifier ◽  
Average Output Power ◽  
Peak Power ◽  
Beam Quality ◽  
Laser System ◽  
Practical Implementation ◽  
Average Output ◽  
Tapered Fiber ◽  
Polarization Maintaining

Abstract We demonstrate a compact picosecond master-oscillator power-amplifier (MOPA) system based on an Yb-doped polarization-maintaining double-clad tapered fiber (T-DCF) delivering pulses with over 1.26 MW peak power and average output power up to 200 W preserving near diffraction limited beam quality. The unique properties of an active tapered fiber enable to amplify the seed pulses directly with no need for applying of additional stretching technique. This simplified laser system can find the practical implementation in industrial micromachining.

A Novel Dual-Band Concurrent Asymmetric Doherty Power Amplifier for Wireless Communications

2019 ◽  
Vol 28 (14) ◽  
pp. 1950235 ◽  
Author(s):  
Shaban Rezaei Borjlu ◽  
Massoud Dousti
Keyword(s):  
Output Power ◽  
Power Amplifier ◽  
Mobile Communications ◽  
Bandpass Filter ◽  
Dual Band ◽  
Power Gain ◽  
Average Output ◽  
Measurement Results ◽  
Saturated Output Power ◽  
Doherty Power Amplifier

In this paper, a different dual-band asymmetric Doherty power amplifier (ADPA) with a novel dual-band bandpass filter (DBBPF) with quad-section stepped impedance resonators (SIRs) is presented. This specific DBBPF rejects the annoying frequencies of the second and third harmonics in the dual-band and contributes considerably to performance improvement of ADPA. This structure is confirmed with the design, simulation, implementation and testing of a 10 W GaN-based ADPA for global system for mobile communications (GSM) and worldwide interoperability for microwave access (WiMAX) applications at 1.84 and 3.5[Formula: see text]GHz, respectively. In the measurement results, the ADPA defines a drain efficiency (DE) of 63.7% with an output power of 35[Formula: see text]dBm and power gain is 14.2[Formula: see text]dB, and a DE of 47.5% with an output power of 34.5[Formula: see text]dBm and power gain is 10.4[Formula: see text]dB at the 9[Formula: see text]dB output power back-off (OBO) from the saturated output power in the two frequency bands. Linearity effects, applying 10[Formula: see text]MHz 16 QAM signal and a 5[Formula: see text]MHz WiMAX signal, display an adjacent channel leakage ratio of [Formula: see text] and [Formula: see text][Formula: see text]dBc with the average output power of 36.8/36[Formula: see text]dBm at 1.84/3.5[Formula: see text]GHz, respectively.

scholarly journals Doherty Power Amplifier for LTE-Advanced Systems

Technologies ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 60 ◽  
Author(s):  
Abdulkhaleq ◽  
Yahya ◽  
Al-Yasir ◽  
Parchin ◽  
McEwan ◽  
...  
Keyword(s):  
Power Amplifier ◽  
Phase Measurement ◽  
Average Power ◽  
High Electron Mobility Transistors ◽  
Substrate Material ◽  
High Electron ◽  
Average Output ◽  
Load Impedance ◽  
Optimum Load ◽  
Doherty Power Amplifier

The design and implementation of an asymmetrical Doherty power amplifier are discussed, where two Cree GaN High Electron Mobility Transistors (HEMTs) devices are used for designing an asymmetrical Doherty power amplifier to achieve saturated power of 48 dBm and optimal back-off efficiency of 8 dB in the frequency band of 3.3–3.5 GHz. Rogers RO4350B material is used as a substrate material, a back-off of 8 dB was achieved with an average gain of 10 dB. Load-pull data are an important tool for determining the optimum load impedance that the transistor needs to see. Additionally, the measured efficiency was 50% when the designed amplifier was tested by a modulated signal of 8 dB peak-to-average-power ratio when the average output power was 40 dBm. At the same time, the linearity of the designed amplifier was measured and found 31.8 dB which can be improved using a digital pre-distorter. The gain phase measurement can be used as an indicator for compensating the phase difference between the two cells.

scholarly journals A Power Amplifier with Large High-Efficiency Range for 5G Communication

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5581
Author(s):  
Zhiwei Zhang ◽  
Zhiqun Cheng ◽  
Guohua Liu
Keyword(s):  
Output Power ◽  
Design Process ◽  
Power Amplifier ◽  
High Efficiency ◽  
New Method ◽  
Saturated Output Power ◽  
Doherty Power Amplifier ◽  
5G Communication

This paper presents a new method to design a Doherty power amplifier (DPA) with a large, high-efficiency range for 5G communication. This is through analyzing the drain-to-source capacitance (CDS) of DPAs, and adopting appropriate impedance of the peak device. A closed design process is proposed, to design the extended efficiency range DPA based on derived theories. For validation, a DPA with large efficiency range was designed and fabricated by using two equal devices. The measured results showed that the saturated output power was between 43.4 dBm and 43.7 dBm in the target band. Around 70% saturated drain efficiency is obtained with a gain of greater than 11 dB. Moreover, the obtained drain efficiency is larger than 50% at the 10 dB power back-off, when operating at 3.5 GHz. These superior performances illustrate that the implemented DPA can be applied well in 5G communication.

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