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Articles de revues sur le sujet « Power amplifiers »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 25 juillet 2025

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1

Wang, Haishuo, Tiancheng Yu, and Zhe Yang. "Design and output spectral peak power optimization of E-band fiber-amplified spontaneous emission spectra." Highlights in Science, Engineering and Technology 72 (December 15, 2023): 624–31. http://dx.doi.org/10.54097/4w1mdt53.

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Fiber optic amplifiers will improve the power of signals propagating in optical fibers, usually using doped ions as amplifiers. The bismuth-doped fiber amplifier can amplify the current E-band signal light, which is less used, and provide a solution to enhance the communication transmission capacity.In this essay, Matlab is used as a research tool, and the bismuth-doped fiber amplifier is selected, and the energy level system is a three-energy levelThe 830 nm-wavelength pumping source amplifies the signal light at 1390 nm. The bismuth-ion velocity and power amplification propagation equations

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Sun, Jiawei. "Different Structures of Audio Power Amplifiers." Highlights in Science, Engineering and Technology 111 (August 19, 2024): 1–6. http://dx.doi.org/10.54097/17szgx18.

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In recent years, the world's technological advancements have been continuously improving, with semiconductor technology developing rapidly. As a result, power amplifier circuits have also seen rapid development and widespread application. There are various types of power amplifier circuits, among which the one specifically designed for amplifying audio is the audio power amplifier. Serving as an electronic amplifier, the audio power amplifier can amplify low-power electronic audio signals to levels capable of driving devices, making its presence noticeable in many audio systems. Understanding

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Shukla, Sachchidanand, Syed Shamroz Arshad, Kavita Thakur, and Geetika Srivastava. "Issues and Challenges in Small-Signal Low-Power Amplifiers: A Review." Indian Journal Of Science And Technology 17, no. 36 (2024): 3787–99. http://dx.doi.org/10.17485/ijst/v17i36.2171.

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Background: Contemporary linear electronic circuit designs frequently include small-signal low-power amplifiers as a fundamental building block. These amplifiers are widely used as LNAs (Low Noise Amplifiers) in the pre-amplifier stages of both low-frequency and high-frequency featured electronic circuits. Objectives: To review the recent advances in the design of small-signal low-power amplifiers based on device configuration of BJTs, JFETs and MOSFETs for low (≤1KHz) and high frequencies (≥1MHz) at smaller input voltage (<1 Volt). Methods: The articles published between 2010 to 2024 are s

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Mei, Shangming, Yihua Hu, Hui Xu, and Huiqing Wen. "The Class D Audio Power Amplifier: A Review." Electronics 11, no. 19 (2022): 3244. http://dx.doi.org/10.3390/electronics11193244.

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Class D power amplifiers, one of the most critical devices for application in sound systems, face severe challenges due to the increasing requirement of smartphones, digital television, digital sound, and other terminals. The audio power amplifier has developed from a transistor amplifier to a field-effect tube amplifier, and digital amplifiers have made significant progress in circuit technology, components, and ideological understanding. The stumbling blocks for a successful power amplifier are low power efficiency and a high distortion rate. Therefore, Class D audio amplifiers are becoming

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Kharis, Muhamad, Dhidik Prastiyanto, and Suryono Suryono. "Perbandingan Efisiensi Daya Penguat Audio Kelas AB dengan Penguat Audio Kelas D untuk Keperluan Sound System Lapangan." Jurnal Teknik Elektro 10, no. 2 (2018): 54–58. http://dx.doi.org/10.15294/jte.v10i2.11183.

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Class AB audio amplifiers are commonly used but the efficiency is 50%. While the efficiency of class D audio amplifiers is 90% but are rarely used. The purpose of this research is to know how much the power efficiency of field sound system between 1000 watts class AB amplifier and 900 watts class D amplifier. This study is a comparative study that compares different variables with the same sample. The results of power efficiency are obtained from the percentage comparison between the output power and the input power of each audio amplifier. The power efficiency of class D audio amplifiers with

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Choi, Hojong. "Development of a Class-C Power Amplifier with Diode Expander Architecture for Point-of-Care Ultrasound Systems." Micromachines 10, no. 10 (2019): 697. http://dx.doi.org/10.3390/mi10100697.

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Point-of-care ultrasound systems are widely used in ambulances and emergency rooms. However, the excessive heat generated from ultrasound transmitters has an impact on the implementation of piezoelectric transducer elements and on battery consumption, thereby affecting the system’s sensitivity and resolution. Non-linear power amplifiers, such as class-C amplifiers, could substitute linear power amplifiers, such as class-A amplifiers, which are currently used in point-of-care ultrasound systems. However, class-C power amplifiers generate less output power, resulting in a reduction of system sen

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Ismail, Khadijah, P. S. Menon, Sahbudin Shaari, Abang Annuar Ehsan, Norhana Arsad, and A. Ashrif A. Bakar. "Link Power Level Improvements in an Amplified 8-Channel CWDM System with Hybrid EDFA-SOA Pre-Amplifier." Applied Mechanics and Materials 799-800 (October 2015): 1361–65. http://dx.doi.org/10.4028/www.scientific.net/amm.799-800.1361.

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The link power improvement in a coarse wavelength division multiplexing (CWDM) system which is transmitted using a hybrid erbium-doped fiber amplifier (EDFA) and semiconductor optical amplifier (SOA) scheme as a pre-amplifier, is discussed. The network is designed for amplifying 8 CWDM channels ranging from 1471 nm to 1611 nm. The hybrid amplifiers’ gain measurement is obtained from experimental work with gain peak at 22 dB which is observed at 1531 nm. The amplifiers also caused power increment of 5.06 dB in the transmission link before the signal is split individually at the receiving end. B

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Kumar, Sunil, and Arun Kr Chatterjee. "Comparative study of different Sense Amplifiers in 0.18um technology." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 7, no. 3 (2013): 615–19. http://dx.doi.org/10.24297/ijct.v7i3.3440.

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A comparative study of different types of sense amplifiers [1] using 0.18um technology is presented. The sense amplifiers under considerations are used in SRAM and DRAM cells.The sensing delay of different types of sense amplifiersÂ are evaluated with respect to variation of bitline capacitance. Comparative results are also provided for the variation in delay with respect to power supply. Extensive results based on 0.18um CMOS technology using CADENCE Spectre simulation tools are presented for different architectures of sense amplifiers. From these results it has been proven that if the output

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Choi, Ui-Gyu, and Jong-Ryul Yang. "A 120 W Class-E Power Module with an Adaptive Power Combiner for a 6.78 MHz Wireless Power Transfer System." Energies 11, no. 8 (2018): 2083. http://dx.doi.org/10.3390/en11082083.

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In this article, a highly efficient power module is presented with two class-E power amplifiers and an adaptive power combiner for transmitting output powers >100 W at 6.78 MHz in a wireless power transfer system. The losses caused by the combiners and interstage matching circuits or mismatching between the amplifier, and the combiners can significantly reduce the overall efficiency of the power module. To achieve an efficient combination of the output amplifier signals, the adaptive power combiner is proposed based on the consideration of the optimum load impedance characteristics of the p

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Alybin, Vyacheslav, Aleksey Syomochkin, Vladimir Rozhkov, and Sergey Avramenko. "Major Items of Construction Amplifiers of UNF Power for the Auxiliary Systems of Spacecrafts." Infocommunications and Radio Technologies 5, no. 1 (2022): 70–78. http://dx.doi.org/10.29039/2587-9936.2022.05.1.05.

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Prospective designs of microwave power amplifiers for on-board equipment of service systems are considered, in which the problem of minimizing the area occupied by them on a thermally stabilized plate of a spacecraft is solved. Microwave power amplifiers provide good heat dissipation and require a degree of redundancy. Each of the amplifiers included in the redundant microwave power amplifier is made on boards located perpendicular to the heat-stabilized plate and fixed on the plate on one or both sides. The area occupied by a duplicated or triple redundant microwave power amplifier does not e

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Ilyushin, Paul Ya, Daniil E. Shipilo, Irina A. Nikolaeva, Nikolay A. Panov, and Olga G. Kosareva. "Time-domain model for signal transformation in semiconductor optical amplifiers for bit error rate estimation in communication lines." Journal of Optical Technology 91, no. 11 (2024): 744. https://doi.org/10.1364/jot.91.000744.

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Subject of study. The study focuses on a fiber-optic communication line incorporating semiconductor optical amplifiers, specifically spontaneous emission and the nonlinear effects in the amplifiers that lead to digital signal transmission errors. Aim of study. The aim of this study was to develop a model of a fiber-optic communication line with integrated semiconductor optical amplifiers, taking into account distortion sources for both weak and strong signals, namely, spontaneous emission and nonlinear effects in the active medium of the amplifiers. Method. The study was conducted using numeri

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Elkhaldi, Said, Moustapha El Bakkali, Naima Amar Touhami, Taj-eddin Elhamadi, and Hmamou Abdelmounim. "Linearization, EM Simulation, and Realization of a 40 DBM Class-AB Gan Power Amplifier." International Journal of Electrical and Electronics Research 12, no. 4 (2024): 1418–26. https://doi.org/10.37391/ijeer.120436.

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This research article presents the comprehensive design and analysis of a 2.45 GHz RF power amplifier operating at 40 dBm using GaN technology. The amplifier is built around the CGH40010F transistor and employs a Linearization with Nonlinear Components Method (LINC) for enhanced linearity. The study outlines the design methodology, including the selection of the CGH40010F transistor and the application of the LINC technique. It investigates the amplifier's performance characteristics, including power output, linearity, and efficiency at the 2.45 GHz frequency. The findings reveal a robust Clas

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13

Mbonane, Sandile H., and Viranjay M. Srivastava. "Comparative Parametric Analysis of Class-B Power Amplifier Using BJT, Single-Gate MOSFET, and Double-Gate MOSFET." Materials Science Forum 1053 (February 17, 2022): 137–42. http://dx.doi.org/10.4028/p-57edxh.

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This paper presents system performance indices for a class-B power amplifier using Double-Gate (DG) Metal Oxide Semiconductor Field Effect Transistor (MOSFET). It also presents a comparative analysis of three power amplifiers using different switching devices, i.e. Bipolar Junction Transistor (BJT), MOSFET, and DG MOSFET. The MOSFET used in this research work is based on Silicon for n-MOSFET and SiO2 has been used as oxide layer. These power amplifiers are also being designed and simulated to test the speed and time (taken for each of these power amplifiers) to get the output signal when an in

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Murtianta, Budihardja, and Erlina Sari. "Penguat Jembatan dengan Untai Pembalik Fase." Elektrika 14, no. 2 (2022): 58. http://dx.doi.org/10.26623/elektrika.v14i2.5329.

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The maximum output voltage of the audio amplifier is limited to the magnitude of the power supply voltage of the power transistor or the operational amplifier on the final amplifier. This limits the maximum power of the audio amplifier output. The way to enlarge the output power of the audio amplifier without increasing the voltage is the bridge method or bridged modes. With this method a bridge amplifier will be generated. This Bridge Amplifier is also known as Bridge-Tied Load (BTL) or Bridged Transformerless. The principle of Bridge Amplifiers is to use a pair of final amplifiers whose outp

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Xu, Lisong, Hongwen Li, Pengzhi Li, and Chuan Ge. "The Application of Classical Control in the Design and Analysis of Power Amplifiers for Driving Piezoelectric Stack Actuators." Electronics 10, no. 6 (2021): 720. http://dx.doi.org/10.3390/electronics10060720.

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This study proposes a new method to design an analog circuit based on the control model of the circuit, and the method is applied in the design of the power amplifiers for driving piezoelectric stack actuators. Focusing on the stability of the circuit, two power amplifiers for driving piezoelectric stack actuators are analyzed deeply. The power amplifier using high-voltage operational amplifiers has a simple circuit structure, and the bandwidth and the ripple of the power amplifier are about 43 kHz and 16 mV, respectively. As for the power amplifier using general operational amplifiers, it pos

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Gangadharan, Shaina, Ruqaiya Khanam, and Veeraiyah Thangasamy. "A Study of RF Power Amplifiers for 5G and Future Generation Mobile Communication: Can FinFET Replace CMOS?" International Journal of Experimental Research and Review 46 (December 30, 2024): 222–39. https://doi.org/10.52756/ijerr.2024.v46.018.

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A low-power strategy that can manage analogue, digital, and RF functionalities on a similar chip is crucial for wireless systems. Various difficulties restrict the widespread adoption of CMOS power amplifiers despite the fact that they provide highly integrated, low-cost wireless communication. Some of the main issues with CMOS power amplifiers include non-linearity, low breakdown voltage, a lack of high-voltage capacitors, and incorrect RF models. The RF signal is amplified without distortions using a linear power amplifier (LPA), which is less effective whenever driven by constant voltage. I

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Park, Min-Sang, Gwon-Seok Sun, and Jin-Young Kim. "A Study on the Automatic Calibration Function of RF Amplifiers Using Artificial Neural Networks." Korea Industrial Technology Convergence Society 28, no. 2 (2023): 41–49. http://dx.doi.org/10.29279/jitr.2023.28.2.41.

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In this study, power amplifiers are designed and manufactured based on the frequency specifications by customers. After learning appropriate compensation values according to the function and performance degradation factors of the manufactured power amplifier using an artificial neural network, the power amplifier itself can maintain an optimal performance when its function and performance degrade. The artificial neural networks are applied to power amplifiers using the STM32F series of microcontrollers, which are being widely used for industrial purposes in recent years. Hence, after manufactu

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Rapp, Lutz. "Amplifiers in Multi–Band Scenarios — Output Power Requirements, Control and Performance Characteristics." Journal of Lightwave Technology 42, no. 6 (2023): 1991–99. https://doi.org/10.1109/JLT.2023.3331084.

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Parallel data transmission in several wavelength bands over a single optical fiber imposes divergent requirements on the employed optical amplifiers. The focus of the investigations is on the maximum output power and the maximum gain each of the amplifiers needs to be designed for. The results for a C+L–band system reveal that the maximum output power provided by a long–wavelength band (L–band) amplifier is limited and any further increase of the total power launched into a fiber span needs to be realized by higher total powers in the conventional band (C–band). Based o

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Tiwari, Nitendra kumar. "Low Power Reduction Techniques Implementation and Analysis in Sense Amplifier Circuit Configurations." Journal of Futuristic Sciences and Applications 5, no. 2 (2022): 31–37. http://dx.doi.org/10.51976/jfsa.522205.

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MTCMOS (Multi-Threshold CMOS), sleepy stack, sleepy keeper, and footer stack are examples of low power saving techniques incorporated into the core gpdk 90nm technology papers used in the proposed study using Cadence. The main focus of these tests is the power consumption of various sense amplifier circuits. The simulation results show that the charge-transfer sense amplifier uses much less energy than voltage and current sense amplifiers. The present mode detecting amplifier’s power consumption can be decreased by up to 98 percent by using MTCMOS technology.

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Choi, Hojong. "Power Amplifier Design for Ultrasound Applications." Micromachines 14, no. 7 (2023): 1342. http://dx.doi.org/10.3390/mi14071342.

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A design analysis of the power amplifiers developed for ultrasound applications was conducted because ultrasound applications require different types of power amplifiers, which are one of the most critical electronic components in ultrasound systems. To generate acoustic signals using transducers, which are among the most important mechanical devices in ultrasound systems, an appropriate output voltage, current, or power signal must be produced by a power amplifier. Therefore, an appropriate design analysis of the power amplifier must be conducted to obtain the optimal performance from a trans

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Sachchidanand, Shukla, Shamroz Arshad Syed, Thakur Kavita, and Srivastava Geetika. "Issues and Challenges in Small-Signal Low-Power Amplifiers: A Review." Indian Journal of Science and Technology 17, no. 36 (2024): 3787–99. https://doi.org/10.17485/IJST/v17i36.2171.

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Abstract <strong>Background:</strong> Contemporary linear electronic circuit designs frequently include small-signal low-power amplifiers as a fundamental building block. These amplifiers are widely used as LNAs (Low Noise Amplifiers) in the pre-amplifier stages of both low-frequency and high-frequency featured electronic circuits.<strong> Objectives:</strong> To review the recent advances in the design of small-signal low-power amplifiers based on device configuration of BJTs, JFETs and MOSFETs for low (≤1KHz) and high frequencies (≥1MHz) at smaller input voltage (<1 V

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Yan, Jonmei J., Paul Draxler, Calogero D. Presti, Donald F. Kimball, and Peter M. Asbeck. "Digital predistortion of envelope-tracking power amplifiers under average power back-off and long-term average power efficiency for base-station applications." International Journal of Microwave and Wireless Technologies 5, no. 2 (2013): 171–77. http://dx.doi.org/10.1017/s1759078713000147.

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In many base-station applications, the load/usage fluctuates over time periods of hours to days, thereby varying the required transmit power by as much as 10 dB. It is desirable to maintain high efficiency and linearity in the power amplifier under these back-off conditions in order to achieve high long-term efficiency. This paper demonstrates a scalable digital predistortion (DPD) approach that can be applied under different power back-off levels in envelope-tracking (ET) amplifiers and quantifies the associated efficiency. Efficiency comparisons are made with other amplifier configurations s

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Zhou, Yiping, Xudong Li, Chaojie Wei, et al. "5 kHz, 4.2mJ, 900 ps end-pumped Nd:YVO₄ MOPA laser system." Optics Express 30, no. 16 (2022): 29833. http://dx.doi.org/10.1364/oe.468386.

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A 5 kHz sub-nanosecond master oscillator power amplifier (MOPA) laser system was reported in this paper. The master oscillator was an electro-optically Q-switched Nd:YVO4 laser directly pumped at 879 nm, yielding a pulse energy of 520 µJ and a pulse width of 900 ps at 5 kHz. With two Nd:YVO4 amplifiers directly pumped at 914 nm, the pulse energy was further scaled up. Under the absorbed pump energy of 11.0 mJ, the pulse energy was amplified to 4.2 mJ, corresponding to a peak power of 4.7 MW. The optical-to-optical efficiency of the amplifiers reached 33.5%.

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Chiou, Hwann-Kaeo, Hsin-Chieh Lin та Da-Chiang Chang. "High-Efficiency and Cost-Effective 10 W Broadband Continuous Class-J Mode Quasi-MMIC Power Amplifier Design Utilizing 0.25 μm GaN/SiC and GaAs IPD Technology for 5G NR n77 and n78 Bands". Electronics 12, № 16 (2023): 3494. http://dx.doi.org/10.3390/electronics12163494.

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This paper presents two power amplifiers designed for 5G NR n77 and n78 bands. These power amplifiers were fabricated using WINTM Semiconductors’ 0.25 μm GaN/SiC technology and GaAs IPD technology. To achieve a reduction in costs, GaAs IPD technology was incorporated in the design, leading to the realization of a quasi-monolithic microwave integrated circuit design. To ensure high power, high efficiency, and broadband operation, a continuous Class-J mode output matching network was utilized. The power amplifier with split chip-on-board wire-bond assembly had a power gain of 21.7 dB, a 3 dB pow

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You, Kiheum, and Hojong Choi. "Wide Bandwidth Class-S Power Amplifiers for Ultrasonic Devices." Sensors 20, no. 1 (2020): 290. http://dx.doi.org/10.3390/s20010290.

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Wide bandwidth ultrasonic devices are a necessity in high-resolution ultrasonic systems. Therefore, constant output voltages need to be produced across the wide bandwidths of a power amplifier. We present the first design of a wide bandwidth class-S power amplifier for ultrasonic devices. The −6 dB bandwidth of the developed class-S power amplifier was measured at 125.07% at 20 MHz, thus, offering a wide bandwidth for ultrasonic devices. Pulse-echo measurement is a performance measurement method used to evaluate the performance of ultrasonic transducers, components, or systems. The pulse-echo

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SUDO, SHOICHI. "PROGRESS IN OPTICAL FIBER AMPLIFIERS." International Journal of High Speed Electronics and Systems 07, no. 01 (1996): 1–35. http://dx.doi.org/10.1142/s0129156496000025.

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Recent progress in fiber amplifier technology is reviewed. Broad band and high power are currently the key goals in the field of fiber amplifiers in conjunction with amplified system development. Broad-band EDFAs using fluoride-based hosts and high-power EDFAs with powerful pump lasers are described in detail. Recent progress and other requirements for optical amplifiers i.e. high gain, low noise, and high reliability, are all reviewed. The limitations in relation to achievable gain are described as well as the highest gain ever achieved. A method for its reduction are described. In relation t

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Dong, Ruibing, Yiheng Song, and Yang Xing. "A 110 GHz Feedback Amplifier Design Based on Quasi-Linear Analysis." Electronics 12, no. 17 (2023): 3725. http://dx.doi.org/10.3390/electronics12173725.

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The power gain and output power of millimeter-wave (mm-Wave) and terahertz (THz) amplifiers are critical performance metrics, particularly when the operating frequencies of amplifiers are near to the maximum oscillator frequency (fmax) of the transistor. This paper presents the design of a 110 GHz amplifier based on the quasi-linear method. The power gain can be boosted to maximum achievable gain (Gmax) using a linear, lossless, reciprocal feedback network, though this leads to a simultaneous decrease in output power. Based on quasi-linear analysis, for an amplifier with Gmax gain, when the K-

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Jurnal, Redaksi Tim. "PERANCANGAN RANGKAIAN PENGUAT DAYA DENGAN TRANSISTOR." Sutet 7, no. 2 (2018): 88–92. http://dx.doi.org/10.33322/sutet.v7i2.81.

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The power amplifier circuit is a circuit used to amplify or magnify input signals. The use of a transistor as an amplifier is that the current on the base is used to control the larger current given to the collector through the transistor. The small current change on the controlling base is what is called a large change in the current flowing from the collector to the emitter. The advantages of the amplifier transistors can not only amplify the signal, but these transistors can also be used as current amplifiers, voltage amplifiers and power amplifiers.

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Choi, Hojong. "Prelinearized Class-B Power Amplifier for Piezoelectric Transducers and Portable Ultrasound Systems." Sensors 19, no. 2 (2019): 287. http://dx.doi.org/10.3390/s19020287.

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Portable ultrasound systems typically suffer from unwanted heat and limited battery life, resulting in reduced system performance or the applicable number of piezoelectric transducer elements. This can be a bottleneck in widely used portable ultrasound systems. Class-A power amplifiers are typically used in portable ultrasound systems. However, unwanted heat dissipation needs to be reduced by using large cooling fans and heat pipe structures. To reduce unwanted heat, class-B power amplifiers may be a possible solution. However, the non-linearity of class-B power amplifiers could limit their in

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Sajedin, Maryam, I. T. E. Elfergani, Jonathan Rodriguez, Raed Abd-Alhameed, and Monica Fernandez Barciela. "A Survey on RF and Microwave Doherty Power Amplifier for Mobile Handset Applications." Electronics 8, no. 6 (2019): 717. http://dx.doi.org/10.3390/electronics8060717.

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This survey addresses the cutting-edge load modulation microwave and radio frequency power amplifiers for next-generation wireless communication standards. The basic operational principle of the Doherty amplifier and its defective behavior that has been originated by transistor characteristics will be presented. Moreover, advance design architectures for enhancing the Doherty power amplifier’s performance in terms of higher efficiency and wider bandwidth characteristics, as well as the compact design techniques of Doherty amplifier that meets the requirements of legacy 5G handset applications,

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Kwak, Joon Young, and Sung-Yun Park. "Compact Continuous Time Common-Mode Feedback Circuit for Low-Power, Area-Constrained Neural Recording Amplifiers." Electronics 10, no. 2 (2021): 145. http://dx.doi.org/10.3390/electronics10020145.

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A continuous-time common-mode feedback (CMFB) circuit for low-power, area-constrained neural recording amplifiers is proposed. The proposed CMFB circuit is compact; it can be realized by simply replacing passive components with transistors in a low-noise folded cascode operational transconductance amplifier (FC-OTA) that is one of the most widely adopted OTAs for neural recording amplifiers. The proposed CMFB also consumes no additional power, i.e., no separate CMFB amplifier is required, thus, it fits well to low-power, area-constrained multichannel neural recording amplifiers. The proposed C

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Kwak, Joon Young, and Sung-Yun Park. "Compact Continuous Time Common-Mode Feedback Circuit for Low-Power, Area-Constrained Neural Recording Amplifiers." Electronics 10, no. 2 (2021): 145. http://dx.doi.org/10.3390/electronics10020145.

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A continuous-time common-mode feedback (CMFB) circuit for low-power, area-constrained neural recording amplifiers is proposed. The proposed CMFB circuit is compact; it can be realized by simply replacing passive components with transistors in a low-noise folded cascode operational transconductance amplifier (FC-OTA) that is one of the most widely adopted OTAs for neural recording amplifiers. The proposed CMFB also consumes no additional power, i.e., no separate CMFB amplifier is required, thus, it fits well to low-power, area-constrained multichannel neural recording amplifiers. The proposed C

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Ivanyushkin, Roman Yu, and Kirill O. Razin. "ENERGY EFFICIENCY OF THE POWER AMPLIFIER ACCORDING TO W. DOHERTY’S SCHEME WITH AUTOMATIC POWER ADJUSTMENT." SYNCHROINFO JOURNAL 9, no. 1 (2023): 25–29. http://dx.doi.org/10.36724/2664-066x-2023-9-1-25-29.

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At present, in relation to the power amplifiers of digital television broadcast transmitters, the scheme proposed by engineer William Dougherty for the construction of broadcast transmitters with amplitude modulation is widely used. W. Dougherty’s method, today is practically the only solution for improving the energy efficiency of OFDM signal power amplifiers, as applied to terrestrial digital television transmitters, when the wide band of the envelope of such a signal does not allow the construction of a transmitter based on a polar architecture. Transmitters for digital terrestrial televisi

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Nadir, Z., and F. Touati. "Class-E Amplifier Design Improvements for GSM Frequencies." Journal of Engineering Research [TJER] 7, no. 2 (2011): 74. http://dx.doi.org/10.24200/tjer.vol8iss1pp74-82.

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Efficient power amplifiers are essential in portable battery-operated systems such as mobile phones. Also, the power amplifier (PA) is the most power-consuming building block in the transmitter of a portable system. This paper investigates how the efficiency of the power amplifier (which is beneficial for multiple applications in communcation sector) can be improved by increasing the efficiency of switching mode class E power amplifiers for frequencies of 900 MHz and 1800 MHz. The paper tackles modeling, design improvements and verification through simulation for higher efficiencies. This is t

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Jang, Jejin, Jaehyuk Choi, Donghun Lee, and Hyungsoo Mok. "Design Procedure of Cascaded Multilevel Inverter for High-Power Amplifier in SONAR System." Energies 17, no. 7 (2024): 1581. http://dx.doi.org/10.3390/en17071581.

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In recent years, there has been a trend toward expanding the operating frequency range and increasing the output power of Sound Navigation and Ranging (SONAR) systems to enhance their acoustic detection capabilities. However, due to this increase in operational power, the electrical capacity of amplifiers for SONAR system operation also increases, necessitating High-Power Amplifiers. When configured with a single amplifier, as in conventional methods, the volume of amplifiers increases due to volumetric increases in heat dissipation, components, and windings. These issues are detrimental to SO

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Oki, Daiki, Satoru Kawauchi, Cong Bing Li, et al. "A Power-Efficient Noise Canceling Technique Using Signal-Suppression Feed-Forward for Wideband LNAs." Key Engineering Materials 643 (May 2015): 109–16. http://dx.doi.org/10.4028/www.scientific.net/kem.643.109.

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This paper presents a power-efficient noise-canceling technique based on the feed-forward amplifiers, considering a fundamental tradeoff between noise figure (NF) and power consumption in the design of wide-band amplifiers. By suppressing the input signal of the noise cancellation amplifier, the nonlinear effect on the amplifier can be reduced, as well as the power consumption can be smaller. Furthermore, as a lower gain of the noise-canceling sub-amplifier can be achieved simultaneously, further reduction of the power consumption becomes possible. The verification of the proposed technique is

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Apeksha Garg. "Effect of Green Logistics on Designing of Single Bit Cache Memory Architecture." Communications on Applied Nonlinear Analysis 32, no. 3s (2024): 663–80. https://doi.org/10.52783/cana.v32.2725.

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The international economy's fast expansion has made logistics more crucial in addressing shifting societal demands and has also worsened sustainability and environmental issues. With an emphasis on entering and leaving logistics, this study examines the long-term effects of green logistics practices. The paper creates a theoretical framework for examining the effects of green logistical practices on single-bit cache memory architectures' economic, social, and environmental performance. This paper proposes and implements a design analysis of a single-bit static random access memory voltage diff

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Hasegawa, Naoki, and Naoki Shinohara. "Sidelobe reduction with a GaN active array antenna." Wireless Power Transfer 4, no. 2 (2017): 113–19. http://dx.doi.org/10.1017/wpt.2017.8.

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This work proposes a tunable sidelobe reduction method based on a GaN active-antenna technique, in which the output radio frequency power is controlled by the DC drain voltage of the amplifiers. In this study, a 1 × 4 array of active antenna with GaN amplifiers is designed and fabricated. GaN amplifiers capable of up to 10 W-class power output are fabricated and arranged for a four-way active-array antenna. The fabricated single-stage GaN amplifier offers a maximum power-added efficiency of 59.6% and a maximum output power of 39.3 dBm. The maximum output power is decreased to 36.5 dBm upon dec

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Lara, Anuj P., Samudra Roy, and Govind P. Agrawal. "Modeling of High-Power Graded-Index Fiber Amplifiers." Photonics 11, no. 8 (2024): 737. http://dx.doi.org/10.3390/photonics11080737.

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Graded-index fibers have been used in recent years to make high-power fiber lasers and amplifiers. Such fibers exhibit self-imaging, a phenomenon in which any optical beam periodically reproduces its original shape in undoped fibers (no gain). In this work, we employed analytic and numerical techniques to study how self-imaging affects the evolution of a signal beam inside a nonlinear graded-index fiber amplifier, doped with a rare-earth element and pumped optically to provide gain all along its length. We also exploited the variational technique to reduce the computing time and to provide phy

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Mabrok, Mussa, Zahriladha Zakaria, and Nasrullah Saifullah. "Design of Wide-band Power Amplifier based on Power Combiner Technique with Low Intermodulation Distortion." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 5 (2018): 3504. http://dx.doi.org/10.11591/ijece.v8i5.pp3504-3511.

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RF power amplifiers are one of challenging blocks in designing radio frequency transceivers, this is due to non-linearity behavior of power amplifiers that leads to inter-modulation distortion. This paper presents the design of wide-band power amplifier which combined with parallel coupled line band pass filter at the input and output of power amplifier to allow the only required frequency band to pass through the power amplifier. Class-A topology and ATF-511P8 transistor are used in this design. Advanced Design System software used as a simulation tool to simulate the designed wide-band power

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Mussa, Mabrok, Zakaria Zahriladha, and Saifullah Nasrullah. "Design of Wide-band Power Amplifier Based on Power Combiner Technique with Low Intermodulation Distortion." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 5 (2018): 3504–11. https://doi.org/10.11591/ijece.v8i5.pp3504-3511.

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RF power amplifiers are one of challenging blocks in designing radio frequency transceivers, this is due to non-linearity behavior of power amplifiers that leads to inter-modulation distortion. This paper presents the design of wide-band power amplifier which combined with parallel coupled line band pass filter at the input and output of power amplifier to allow the only required frequency band to pass through the power amplifier. Class-A topology and ATF-511P8 transistor are used in this design. Advanced Design System software used as a simulation tool to simulate the designed wide-band power

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Andrews, John R. "Interferometric power amplifiers." Optics Letters 14, no. 1 (1989): 33. http://dx.doi.org/10.1364/ol.14.000033.

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Farmer, Thomas J., Ali Darwish, Benjamin Huebschman, Edward Viveiros, and Mona E. Zaghloul. "High power density SiGe millimeter-wave power amplifiers." International Journal of Microwave and Wireless Technologies 3, no. 6 (2011): 615–20. http://dx.doi.org/10.1017/s1759078711000638.

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This paper presents measured results for two-stage and three-stage high-voltage/high-power (HiVP) amplifiers implemented in a commercial 0.12 μm silicon germanium (SiGe) heterojunction bipolar transistor (HBT) bipolar Complementary Metal Oxide Semiconductor (BiCMOS) process at millimeter wave. The HiVP configuration provides a new tool for millimeter-wave silicon designers to achieve large output voltage swings, high output power density, customizable bias, and a way to minimize, if not eliminate, matching circuitry at millimeter-wave frequencies. The two-stage amplifier has achieved a PSAT =

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Muhamed, Mais, Fariz Abboud, and Mohamad Alhariri. "Broadband Performance of a 6W Pushpull Power Amplifier on the VHF-UHF Band." International Journal of Electronics, Communications, and Measurement Engineering 11, no. 1 (2022): 1–8. http://dx.doi.org/10.4018/ijecme.294892.

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In this paper, a broadband 100-700 MHz power amplifier was designed. The results of simulation are compared with the measurements,The shunt feedback of power amplifier module provides the linear and broadband frequency amplification. The push-pull topology with ferrite balun provides enhanced efficiency and high power generation along In this work a commercially available LDMOS transistor (D2003UK) is used, The amplifier can deliver 6W to a 50 ohm load and has 14dB gain.Broadband high power amplifiers are considered as key components in next generation software defined radio communication syst

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Lee, Dongho. "Second Harmonic Frequency Adjustment Strategy for Class-E Amplifier Design." International Journal of Electrical and Electronics Research 11, no. 3 (2023): 658–61. http://dx.doi.org/10.37391/ijeer.110303.

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Class-E amplifiers are a type of switching amplifiers with an efficiency that approaches 100%. The harmonic frequency is very important in the design of Class-E amplifiers. In this study, the second harmonic frequency is considered in the design of a Class-E amplifier. The Class-E amplifier has been fabricated on FR4 and has demonstrated a power-added efficiency (PAE) of 74.5% at 1.01 GHz. This result shows that the termination of the second-harmonic output is essential for switching amplifiers.

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Akinin, V. E., O. V. Borisov, K. A. Ivanov, Yu V. Kolkovskiy, V. M. Minnebaev, and Al V. Redka. "AIR-COOLED 350 W X-BAND SOLID-STATE POWER AMPLIFIER." Electronic engineering Series 2 Semiconductor devices 258, no. 3 (2020): 43–52. http://dx.doi.org/10.36845/2073-8250-2020-258-3-43-52.

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In this paper we present the results of the design and production of an air-cooled X-band solid-state power amplifier based on AlGaN/GaN/SiC Schottky FET. The power amplifier includes: preliminary power amplifier, output power amplifiers, set of secondary power supplies, digital control unit, monitoring system for the power amplifier performance, set of microwave power waveguide combiners.

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Sandhya, Kalla. "Design and High Performance Evaluation of a Low Power Bit-Line SRAM PMOS Biased Sense Amplifier." INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, no. 06 (2024): 1–5. http://dx.doi.org/10.55041/ijsrem36033.

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Sense amplifiers developed into very big circuits due to their significant role in Memory design. The sense amplifier plays a significant role in terms of its recital, Functionality and reliability of the memory circuits. Fast access time and low power Dissipation are achieved with newly developed circuits of sense amplifiers for low voltage supply. Static RAM is the sense amplifiers at the ends of the two Complementary bit lines that amplify the small voltages to a normal logic level. Static RAM (SRAM) is a type of random access memory that retains data bits in its Memory as long as power is

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Guan, Biao, Fengping Yan, Wenguo Han, et al. "High-Power, Narrow-Linewidth, Continuous-Wave, Thulium-Doped Fiber Laser Based on MOPA." Photonics 10, no. 4 (2023): 347. http://dx.doi.org/10.3390/photonics10040347.

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A high-power, narrow-linewidth, continuous-wave, thulium-doped fiber laser (TDFL) based on a master-oscillator power-amplifier (MOPA) was experimentally demonstrated. The main oscillator (seed source) yielded 0.64 W of narrow-linewidth laser output at a central wavelength of 1940.32 nm and a 3 dB spectral bandwidth of 0.05 nm. The output narrow-linewidth laser from the main oscillator was amplified by two-stage, cladding-pumped, thulium-doped, all-fiber amplifiers. The main amplifier yielded 26 W of narrow-linewidth laser at a central wavelength of 1940.33 nm. The slope efficiency of the main

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K. Abass, A. "Optical Fiber Amplifiers: Optimization and PerformanceEvaluation." DJES 12, no. 1 (2019): 66–72. http://dx.doi.org/10.24237/djes.2019.12108.

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This work demonstrates the simulation of two different types of optical fiber amplifiers (OFA) utilizing OptiSystem–10, namely, 3 m length of erbium doped fiber amplifier (EDFA) and 7 km length of Raman fiber amplifier (RFA). The counter-pumped architecture is adopted for both proposed optical amplifiers. The optimum pump power (OPP) for each amplifier determines in which the longest 3–dB flat gain bandwidth (3–dB BW), reasonable average gain level (Gav), proper average noise figure (NFav) and lower gain variation (Gvar) were achieved. The EDFA shows best performance at conventional band (C–ba

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Guo, Cheng, Afshin Shamsshooli, Michael Vasilyev, et al. "Experimental Investigation of a Hybrid S-Band Amplifier Based on Two Parametric Wavelength Converters and an Erbium-Doped Fiber Amplifier." Photonics 12, no. 2 (2025): 100. https://doi.org/10.3390/photonics12020100.

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Multi-band optical communication presents a promising avenue for the significant enhancement of fiber-optic transmission capacity without incurring additional costs related to new cable deployment via the utilization of the bandwidth beyond the established C&L bands. However, a big challenge in its field implementation lies in the high cost and suboptimal performance of optical amplifiers, stemming from the underdeveloped state of rare-earth-doped fiber-optic amplifier technologies for these bands. Fiber-optic parametric amplifiers provide an alternative for wideband optical amplification,

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