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Journal articles on the topic 'Amplifiers'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 August 2024

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1

Zygarlicki, Jarosław, and Janusz Mroczka. "Method of testing and correcting signal amplifiers’ transfer function using prony analysis." Metrology and Measurement Systems 19, no. 3 (October 1, 2012): 489–98. http://dx.doi.org/10.2478/v10178-012-0042-7.

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Abstract This article presents a way of analyzing the transfer function of electronic signal amplifiers. It also describes the possibility of using signal precorrection which improves the parasitic harmonics in the THD (Total Harmonic Distortion) of the amplified signal by correcting linearity of the tested amplifier’s transfer function. The proposed method of analyzing and presenting the transfer function allows to diagnose the causes of generating parasitic harmonics, what makes it a useful tool when designing low distortion amplifier systems, such as e.g. amplifiers in measurement systems.

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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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3

Kumar, Sunil, and Arun Kr Chatterjee. "Comparative study of different Sense Amplifiers in 0.18um technology." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 7, no. 3 (June 10, 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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Sadegh Kazempourfard, Mohammad, Hamid Nadgaran, and Seyed Mahdi Mousavi. "The effects of pump pulse fluence on the output energy and amplified spontaneous emission of a femtosecond regenerative amplifier." Laser Physics 32, no. 1 (December 14, 2021): 015002. http://dx.doi.org/10.1088/1555-6611/ac3ee8.

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Abstract In this paper, the effects of pump pulse fluence on the output energy and amplified spontaneous emission (ASE) of a femtosecond regenerative amplifier are investigated. One can easily enhance the output energy of laser amplifiers by increasing their pump fluence. This in turn can increase the ASE and reduce the performance of amplifiers in terms of output beam quality, beam stability, etc. This effect would eventually lead to what is called ‘temporal intensity contrast deterioration’. In this work, it is shown that an optimum state of the pump pulse fluence can indeed optimize the amo

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Borel, Andžej. "DEVELOPMENT AND INVESTIGATION OF INPUT AMPLIFIER FOR THE OSCILOSCOPE." Mokslas - Lietuvos ateitis 12 (January 20, 2020): 1–5. http://dx.doi.org/10.3846/mla.2020.11420.

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Digital oscilloscope’s structure has analog signal acquisition circuit, which transforms signal’s amplitude to fit ADC dynamic range. This circuit is commonly called oscilloscope’s vertical or front-end amplifier. Difficulty in designing front-end amplifiers in GHz range largely affects higher frequency range oscilloscope’s price. This work is focused on designing a front-end amplifier using discrete and openly sold components. We propose a design for attenuator, buffer, variable gain circuits. Amplifier’s prototype is designed. Main characteristics of the amplifier were measured. Measured ban

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Kitsios, E. E., and R. F. Boucher. "The Dynamics of Vortex Amplifiers. Part 1: Analytical Model." Journal of Dynamic Systems, Measurement, and Control 107, no. 3 (September 1, 1985): 176–81. http://dx.doi.org/10.1115/1.3140717.

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A semi-empirical technique for the dynamic modeling of vortex amplifiers is demonstrated with reference to one particular vortex amplifier geometry. The model parameters are determined explicitly from the amplifier static characteristics and geometry except for two which are estimated from measurements of the amplifier’s dynamic response. The two are time constants associated with the chamber time delay and the vortex rotational inertia. The model is linearized about a working point and is presented in terms of an admittance matrix. The paper is continued in Part 2 where two of the amplifier’s

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SUDO, SHOICHI. "PROGRESS IN OPTICAL FIBER AMPLIFIERS." International Journal of High Speed Electronics and Systems 07, no. 01 (March 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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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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Mei, Shangming, Yihua Hu, Hui Xu, and Huiqing Wen. "The Class D Audio Power Amplifier: A Review." Electronics 11, no. 19 (October 9, 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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Sullivan, J. A. "Simplified model for designing large KrF amplifiers." Laser and Particle Beams 11, no. 1 (March 1993): 241–56. http://dx.doi.org/10.1017/s0263034600007084.

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A simplified model for determining the performance of large krypton-fluoride laser amplifiers is presented. The model includes a straightforward treatment of the controlling kinetics, an exact solution for energy extraction, and an approximation to amplified spontaneous emission losses; it can be easily programmed to run on personal computers. The inclusion of the controlling basic physics for KrF lasers makes the model ideally suited for the many calculations that are necessary to optimize the design of a specific amplifier. The basic parameters determined in the model are compared to experim

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Sullivan, J. A., G. R. Allen, R. R. Berggren, S. J. Czuchlewski, D. B. Harris, M. E. Jones, B. J. Krohn, et al. "KrF amplifier design issues and application to inertial confinement fusion system design." Laser and Particle Beams 11, no. 2 (June 1993): 359–83. http://dx.doi.org/10.1017/s0263034600004961.

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Los Alamos National Laboratory has assembled an array of experimental and theoretical tools to optimize amplifier design for future single-pulse KrF lasers. The next opportunity to exercise these tools is with the design of the second-generation NIKE system under construction at the Naval Research Laboratory with the collaboration of Los Alamos National Laboratory. Major issues include laser physics (energy extraction in large modules with amplified spontaneous emission) and diode performance and efficiency. Low cost is increasingly important for larger future KrF single-pulse systems (low cos

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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 (December 19, 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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Li, Yin, Yijun Wang, Yun Mao, Weishao Peng, Di Jin, and Ying Guo. "Continuous-Variable Quantum Key Distribution Based on Heralded Hybrid Linear Amplifier with a Local Local Oscillator." Entropy 23, no. 11 (October 24, 2021): 1395. http://dx.doi.org/10.3390/e23111395.

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An improved continuous variable quantum key distribution (CVQKD) approach based on a heralded hybrid linear amplifier (HLA) is proposed in this study, which includes an ideal deterministic linear amplifier and a probabilistic noiseless linear amplifier. The CVQKD, which is based on an amplifier, enhances the signal-to-noise ratio and provides for fine control between high gain and strong noise reduction. We focus on the impact of two types of optical amplifiers on system performance: phase sensitive amplifiers (PSA) and phase insensitive amplifiers (PIA). The results indicate that employing am

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Zhou, Yiping, Xudong Li, Chaojie Wei, Xiaojie Chen, Haobo Xu, Rongwei Fan, Deying Chen, Yugang Jiang, and Renpeng Yan. "5 kHz, 4.2mJ, 900 ps end-pumped Nd:YVO₄ MOPA laser system." Optics Express 30, no. 16 (July 29, 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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Lee, Dongho. "Second Harmonic Frequency Adjustment Strategy for Class-E Amplifier Design." International Journal of Electrical and Electronics Research 11, no. 3 (July 10, 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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Choi, Hojong. "Development of a Class-C Power Amplifier with Diode Expander Architecture for Point-of-Care Ultrasound Systems." Micromachines 10, no. 10 (October 14, 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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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 (March 25, 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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Murtianta, Budihardja, and Erlina Sari. "Penguat Jembatan dengan Untai Pembalik Fase." Elektrika 14, no. 2 (October 22, 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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Jurnal, Redaksi Tim. "PERANCANGAN RANGKAIAN PENGUAT DAYA DENGAN TRANSISTOR." Sutet 7, no. 2 (November 27, 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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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 (June 25, 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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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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Huang, Xiangyuan. "Design and Optimization of E-Band Fluor tellurate Fiber Amplifier Doped with Praseodymium." Highlights in Science, Engineering and Technology 72 (December 15, 2023): 198–204. http://dx.doi.org/10.54097/yyjefj52.

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This study focuses on investigating and selecting an appropriate optical fiber material, specifically emphasizing the utilization of fluorotellurate as the base material. The objective is to enhance the performance of the optical fiber material by incorporating praseodymium ions, which possess unique properties advantageous for optical amplification.To gain an accurate understanding of the working principle of the fiber optic amplifier, a mathematical model is developed. This model acts as a valuable tool for simulating and optimizing the amplifier's performance. By conducting rigorous simulat

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Chen, Ding. "Innovative Design and Application Analysis of Integrated Operational Amplifiers." Highlights in Science, Engineering and Technology 72 (December 15, 2023): 341–51. http://dx.doi.org/10.54097/xtqm8x55.

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Operational amplifiers in integrated circuits come in many varieties and numbers and are an essential part of electronic systems. Its performance directly affects the accuracy and effectiveness of the whole system. As the market demand for operational amplifiers in different fields is growing day by day, according to different kinds of demand, people have designed a variety of operational amplifier structure. This paper describes the basic characteristics of operational amplifiers and analyzes three basic structures that are extremely relevant for modification circuits. The common-source, comm

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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 (March 18, 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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Eimerl, David. "Amplified spontaneous emission in Cassegrainian amplifiers." Applied Optics 26, no. 9 (May 1, 1987): 1594. http://dx.doi.org/10.1364/ao.26.001594.

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Goren, Chana, Yitzhak Tzuk, Gilad Marcus, and Shaul Pearl. "Amplified Spontaneous Emission in Slab Amplifiers." IEEE Journal of Quantum Electronics 42, no. 12 (December 2006): 1239–47. http://dx.doi.org/10.1109/jqe.2006.884580.

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Hu, Yipeng. "Improving noise levels based on amplifier structure analysis." Theoretical and Natural Science 14, no. 1 (November 30, 2023): 117–26. http://dx.doi.org/10.54254/2753-8818/14/20240912.

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As the core component of electronic circuits, amplifiers play a pivotal role in fields such as communications, medical care, audio processing, instrumentation, scientific research and military technology. However, the noise problem of the amplifier has a direct impact on the reliability and accuracy of the system, how to reduce the impact of noise is crucial. This paper aims to study and solve noise problems in amplifier design. The first part focuses on the design of operational amplifiers. By adjusting the circuit structure and introducing current mirrors, the noise of the input and output s

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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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Cuntan, Corina, Caius Panoiu, Manuela Panoiu, Ioan Baciu, and Sergiu Mezinescu. "Using the LabVIEW Simulation Program to Design and Determine the Characteristics of Amplifiers." Chips 3, no. 2 (April 1, 2024): 69–97. http://dx.doi.org/10.3390/chips3020004.

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Because of the large number of parameters that interact in amplifier functions, determining dynamic regime parameters as well as the mode of function of amplifier stages is an extremely complex problem. This paper describes a LabVIEW application for studying the functioning of an amplifier in various connections. The user selects the generator’s parameters, the type of connection and its parameters, as well as the load circuit characteristics. The application can determine both the stage characteristics and the Bode characteristics. The amplifier’s stability zone, as well as its gain and phase

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Li, Feng, Jiali Xiang, Tao Li, Danni Shen, and Tian Li. "Active Indoor Soundscape Design: A Case Study of Ceramic Passive Amplifiers." International Journal of Environmental Research and Public Health 19, no. 18 (September 7, 2022): 11251. http://dx.doi.org/10.3390/ijerph191811251.

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Indoor soundscape research has developed rapidly in recent years, with the aim of improving the single indoor noise reduction method and people’s acoustic comfort. However, practical solutions to promote the generation of positive indoor soundscapes are still insufficient. The purpose of this study was to explore the improvement effect of ceramic passive amplifiers on the indoor soundscape and the relationship between the improvement effect and different amplifier shapes. Objective sound pressure level (SPL) values and subjective soundscape perception were measured for 10 ceramic passive ampli

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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 (June 30, 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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Woestenburg, E. E. M. "Noise properties of balanced amplifier configurations." International Journal of Microwave and Wireless Technologies 3, no. 1 (February 2011): 67–75. http://dx.doi.org/10.1017/s1759078711000018.

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This paper analyzes the noise properties of balanced amplifier configurations in terms of noise waves and discusses the effect of various amplifier configurations on the noise and signal parameters. It shows how the noise generated in the load on the input coupler of a balanced amplifier deteriorates the amplifiers noise resistance parameter with respect to that of its component amplifiers. The properties of two new balanced amplifier configurations will be discussed, which enable the reduction or elimination of this deterioration.

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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 (January 11, 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 (January 11, 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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Singh, Kulwinder, Karan Goel, Kamaljit Singh Bhatia, and Hardeep Singh Ryait. "Investigations of Different Amplifiers in 16 × 40 Gb/S WDM System." Journal of Optical Communications 40, no. 4 (October 25, 2019): 341–46. http://dx.doi.org/10.1515/joc-2017-0092.

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Abstract Different fiber amplifiers such as semiconductor optical amplifier, erbium-doped fiber amplifier and erbium ytterbium-co-doped fiber amplifier (EYCDFA) are investigated for 16×40 GB/s wavelength division multiplexing system. Various performance parameters including Q-factor, bit error rate, jitter, eye opening and eye closure are observed and analyzed. It is reported that EYCDFA is a better choice among the tested amplifiers. The proposed system is also investigated in terms of transmission distance.

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Huang, H., and G. J. Tallents. "The output of a laser amplifier with simultaneous amplified spontaneous emission and an injected seed." Laser and Particle Beams 27, no. 3 (June 19, 2009): 393–98. http://dx.doi.org/10.1017/s0263034609000500.

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AbstractThe minimum irradiance needed to overcome amplified spontaneous emission (ASE) of a seed beam injected into a laser amplifier is evaluated. The treatment is particularly applicable to extreme ultraviolet (EUV) and X-ray laser schemes to inject laser harmonic radiation as a seed into (1) plasma laser amplifiers and (2) free-electron lasers. Simple expressions and calculations are given for the minimum injected irradiance required for amplification of the injected seed beam to exceed ASE from the amplifier, including the effects of gain saturation, assuming one dimensional radiative tran

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Sokol, Miroslav, Pavol Galajda, and Patrik Jurik. "Design and Realization of Ultra-Wideband Differential Amplifiers for M-Sequence Radar Applications." Sensors 24, no. 7 (March 27, 2024): 2143. http://dx.doi.org/10.3390/s24072143.

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Amplification of wideband high-frequency and microwave signals is a fundamental element within every high-frequency circuit and device. Ultra-wideband (UWB) sensor applications use circuits designed for their specific application. The article presents the analysis, design, and implementation of ultra-wideband differential amplifiers for M-sequence-based UWB applications. The designed differential amplifiers are based on the Cherry–Hooper structure and are implemented in a low-cost 0.35 µm SiGe BiCMOS semiconductor process. The article presents an analysis and realization of several designs foc

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Zhu, Ziren, Yu Liu, Jinghan Ye, Juntao Tian, Tianjian Wan, Jinzhou Bai, Yijun Zheng, Rongqing Tan, Zhiyong Li, and Xinjun Su. "Gain Measurement of ZnGeP2 Optical Parametric Oscillator Pulses in a High-Pressure CO2 Amplifier." Photonics 11, no. 2 (February 5, 2024): 154. http://dx.doi.org/10.3390/photonics11020154.

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Laser pulse amplification by a high-pressure CO2 amplifier in the long-wave infrared (LWIR) spectral range is a feasible technology for strong-field physics research. Crystals such as ZnGeP2 (ZGP) have high nonlinear coefficients and transmittance in the LWIR region, with spectral widths of generated pulses closely matching the gain spectrum of high-pressure CO2 amplifiers. Therefore, ZGP optical parametric oscillation (OPO) may allow higher-efficiency energy extraction in amplifiers, improving the output characteristics of LWIR amplification systems. In this study, the gain measurement of ZGP

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Sahota, Jasjot Kaur, and Divya Dhawan. "Performance Analysis of Homodyne-Based FSO System Using Various Optical Amplifiers." Journal of Optical Communications 41, no. 4 (April 28, 2020): 339–46. http://dx.doi.org/10.1515/joc-2018-0005.

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AbstractA detailed performance analysis of homodyne-based coherent detection in Free-space optics (FSO) with various optical amplifiers is presented in this paper. Using homodyne detection in FSO system, the effect of scintillation is mitigated. To further enhance the performance of FSO system, various optical amplifiers such as erbium-doped fibre amplifier, semiconductor optical amplifier, gain-controlled amplifier and black box model of amplifier can be employed in the system. Improvement in the system can be validated in terms of BER, Q-factor and eye diagram.

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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 (March 26, 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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Feldkord, Sven, Marco Reit, and Wolfgang Mathis. "Implementation of a digital evaluation platform to analyze bifurcation based nonlinear amplifiers." Advances in Radio Science 14 (September 28, 2016): 47–50. http://dx.doi.org/10.5194/ars-14-47-2016.

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Abstract. Recently, nonlinear amplifiers based on the supercritical Andronov–Hopf bifurcation have become a focus of attention, especially in the modeling of the mammalian hearing organ. In general, to gain deeper insights in the input-output behavior, the analysis of bifurcation based amplifiers requires a flexible framework to exchange equations and adjust certain parameters. A DSP implementation is presented which is capable to analyze various amplifier systems. Amplifiers based on the Andronov–Hopf and Neimark–Sacker bifurcations are implemented and compared exemplarily. It is shown that t

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Hiti, M. "Validation of combinatorial evaluation of strain-gauge amplifier linearity." ACTA IMEKO 9, no. 5 (December 31, 2020): 205. http://dx.doi.org/10.21014/acta_imeko.v9i5.970.

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This paper describes a validation of a combinatorial calibration technique based calibration procedure for strain-gauge amplifier calibration. The deviation between two strain-gauge amplifiers at calibration using the combinatorial technique is compared to the deviation between the same two amplifiers at calibration on a force calibration machine as a transducer-amplifier chain under unchanged conditions, serving as an amplifier linearity comparator. This enables the validation to be confirmed with a suitable expanded measurement uncertainty of 3 nV/V.

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You, Kiheum, and Hojong Choi. "Wide Bandwidth Class-S Power Amplifiers for Ultrasonic Devices." Sensors 20, no. 1 (January 4, 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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Lopez-Martin, Antonio, Maria Pilar Garde, Jose M. Algueta-Miguel, Javier Beloso-Legarra, Ramon G. Carvajal, and Jaime Ramirez-Angulo. "Energy-Efficient Amplifiers Based on Quasi-Floating Gate Techniques." Applied Sciences 11, no. 7 (April 6, 2021): 3271. http://dx.doi.org/10.3390/app11073271.

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Energy efficiency is a key requirement in the design of amplifiers for modern wireless applications. The use of quasi-floating gate (QFG) transistors is a very convenient approach to achieve such energy efficiency. We illustrate different QFG circuit design techniques aimed to implement low-voltage, energy-efficient class AB amplifiers. A new super class AB QFG amplifier is presented as a design example, including some of the techniques described. The amplifier has been fabricated in a 130 nm CMOS test chip prototype. Measurement results confirm that low-voltage, ultra-low-power amplifiers can

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Gajare, Milind, and Shedge D.K. "CMOS Trans Conductance based Instrumentation Amplifier for Various Biomedical Signal Analysis." NeuroQuantology 20, no. 5 (April 30, 2022): 53–60. http://dx.doi.org/10.14704/nq.2022.20.5.nq22148.

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Feed forward design techniques for the Trans-conductance operational amplifier removes the barriers of operating frequencies. It is now possible to design amplifiers with large the Trans-conductance that operates at Giga hertz frequency range. There are several Trans-conductance amplifiers used to design a medical and Industrial application that helps in processing various bio medical signals such as Electrocardiographs, Electroencephalographs, Electromyograms and several others. The proposed paper shows the implementation of an instrumentation amplifier using CMOS based the Trans-conductance

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Choi, Hojong. "Class-C Linearized Amplifier for Portable Ultrasound Instruments." Sensors 19, no. 4 (February 21, 2019): 898. http://dx.doi.org/10.3390/s19040898.

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Transistor linearizer networks are proposed to increase the transmitted output voltage amplitudes of class-C amplifiers, thus, increasing the sensitivity of the echo signals of piezoelectric transducers, which are the main components in portable ultrasound instruments. For such instruments, class-C amplifiers could be among the most efficient amplifier schemes because, compared with a linear amplifier such as a class-A amplifier, they could critically reduce direct current (DC) power consumption, thus, increasing the battery life of the instruments. However, the reduced output voltage amplitud

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Shukla, Sachchida Nand, Syed Shamroz Arshad, and Geetika Srivastava. "NPN Sziklai pair small-signal amplifier for high gain low noise submicron voltage recorder." International Journal of Power Electronics and Drive Systems (IJPEDS) 13, no. 1 (March 1, 2022): 11. http://dx.doi.org/10.11591/ijpeds.v13.i1.pp11-22.

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Small signal-to-noise ratio (SNR) and multiple noise sources, coupled with very weak signal amplitudes of bio signals make brain-computer interface (BCI) application studies a challenging task. The front-end recorder amplifiers receive very-weak signal (few μV) from high impedance electrodes and for efficient processing of such weak and low frequency (<1 kHz) signals a high gain amplifier with very low operating voltage and low total harmonic distortion (THD) is required. Existing amplifiers suffer from problem of high non-linearity and low common mode rejection. A good sense amplifier at p

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Aminzadeh, Hamed. "A reliable model for the compensation loop of multistage amplifiers at high frequency." Circuit World 45, no. 4 (November 4, 2019): 268–78. http://dx.doi.org/10.1108/cw-03-2019-0021.

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Purpose Multistage amplifiers require a reliable frequency compensation solution to remain stable in a closed-loop configuration. A frequency compensation scheme creates an inner negative feedback loop amongst different amplifying stages and shapes the frequency response such that an unconditionally stable single-pole amplifier results for closed-loop operation. The frequency compensation loop is thus responsible for the placement of the poles and zeros and the final stability of multistage amplifiers. An amplifier incorporating a sophisticated frequency compensation network cannot be, however

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Chen, Yuening, Kecheng Wang, and Yan Zhuang. "Current state and challenges of ECG amplifiers." Highlights in Science, Engineering and Technology 32 (February 12, 2023): 177–85. http://dx.doi.org/10.54097/hset.v32i.4988.

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This paper describes and compares three amplifiers for ECG recording, namely a four-transistor stage band-pass amplifier, a DDA-based fully differential CMOS instrumentation amplifier and an OTA amplifier using current reuse. The performance metrics of the three amplifiers are listed, their respective advantages are compared, what factors limit their disadvantages are analyzed, the current state of the art and the direction of development of the ECG amplifier are indicated, and suggestions are given for further enhancement of the ECG amp. These amplifier circuits are designed in 0.35 µm CMOS a

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Wang, Peiyuan. "Optimal Design of Fiber Amplifier based on Thulium, YttErbium and Bismuth." Highlights in Science, Engineering and Technology 46 (April 25, 2023): 134–41. http://dx.doi.org/10.54097/hset.v46i.7694.

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Although Erbium-doped fiber amplifier is still the mainstream of optical fiber communication nowadays, it has some limitations. The operation of EDFA is limited to 1530-1610nm, so it is an important research direction to explore different elements. This paper introduces three kinds of fiber amplifiers doped with different rare earth elements: Thulium-doped, YttErbium-doped, and Bismuth-doped fiber amplifiers. The optimal optimization performance is obtained through comparison logic by adjusting various parameters. The maximum gains of three rare-earth-doped fiber amplifiers in different wavele

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