Simulation of Power RF GaN Transistors Thermal Parameters in Pulse Mode

2021 ◽  
Vol 23 (4) ◽  
pp. 179-185
Author(s):  
A.I. Khlybov ◽  
◽  
D.V. Rodionov ◽  
A.I. Panteleev ◽  
P.V. Timoshenkov ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Computational Complexity ◽  
Duty Cycle ◽  
Pulse Width ◽  
Thermal Process ◽  
Pulse Mode ◽  
Thermal Mode ◽  
Transistor Channel ◽  
Channel Temperature ◽  
Rf Transistor

This paper contains research results of thermal process in power GaN RF transistor in silicon substrate for pulse mode. Thermal mode research was done using computer simulation. Authors developed methodic allows significant decrease computational complexity. The dependences of maximum transistor channel temperature and thermal resistance as function of pulse width (with constant duty cycle) were done. Thermal simulation was done for power GaN RF transistor with overall gate width 2.1 mm.

scholarly journals Design and characterization of a 6–18 GHz GaN on SiC high-power amplifier MMIC for electronic warfare

2019 ◽  
Vol 11 (7) ◽  
pp. 625-634
Author(s):  
Eduardo Oreja Gigorro ◽  
Emilio Delgado Pascual ◽  
Juan José Sánchez Martínez ◽  
María Luz Gil Heras ◽  
Virginia Bueno Fernández ◽  
...  
Keyword(s):  
Power Amplifier ◽  
High Power ◽  
Duty Cycle ◽  
Pulse Width ◽  
Pulse Mode ◽  
Gate Length ◽  
Electronic Warfare ◽  
Power Added Efficiency ◽  
High Power Amplifier

AbstractA 6–18 GHz high-power amplifier (HPA) design in GaN on SiC technology is presented. This power amplifier consists of a two-stage corporate amplifier with two and four transistors, respectively. It has been fabricated on UMS using their 0.25 µm gate length process, GH25. A study of the suitable attachment method and measurement on wafer and on jig are detailed. This HPA exhibits an averaged output power of 39.2 dBm with a mean gain of 11 dB in saturation and a 24.5% maximum power added efficiency in pulse mode operation with a duty cycle of 10% with a 25 µs pulse width.

scholarly journals Evaluation of spray pattern uniformity using three unique analyses as impacted by nozzle, pressure, and pulse‐width modulation duty cycle

2019 ◽  
Vol 75 (7) ◽  
pp. 1875-1886 ◽  
Author(s):  
Thomas R Butts ◽  
Joe D Luck ◽  
Bradley K Fritz ◽  
W Clint Hoffmann ◽  
Greg R Kruger
Keyword(s):  
Duty Cycle ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Spray Pattern ◽  
Nozzle Pressure

A Unitary-UCA-Root-MUSIC Algorithm Based on MSWF

2014 ◽  
Vol 610 ◽  
pp. 339-344
Author(s):  
Qiang Guo ◽  
Yun Fei An
Keyword(s):  
Computer Simulation ◽  
Computational Complexity ◽  
Real Time ◽  
Unitary Transformation ◽  
Wiener Filter ◽  
Doa Estimation ◽  
Signal Subspace ◽  
Music Algorithm ◽  
Multi Stage ◽  
Simulation Results

A UCA-Root-MUSIC algorithm for direction-of-arrival (DOA) estimation is proposed in this paper which is based on UCA-RB-MUSIC [1]. The method utilizes not only a unitary transformation matrix different from UCA-RB-MUSIC but also the multi-stage Wiener filter (MSWF) to estimate the signal subspace and the number of sources, so that the new method has lower computational complexity and is more conducive to the real-time implementation. The computer simulation results demonstrate the improvement with the proposed method.

scholarly journals Rancang Bangun Pulse Width Modulation (PWM) Sebagai Pengatur Kecepatan Motor DC Berbasis Mikrokontroler Arduino

2018 ◽  
Vol 3 (1) ◽  
pp. 50-58
Author(s):  
Rifdian I. S. ◽  
Hartono Hartono
Keyword(s):  
Duty Cycle ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Arduino Uno

Pulse Width Modulation (PWM) sebagai pengatur kecepatan motor DC telah digunakan secara luas di dunia industri. Kecepatan putar motor dikontrol dengan mengatur duty cycle PWM yang dibangkitkan oleh mikrokontroler arduino. Pada penelitian ini pengaturan nilai PWM dilakukan melalui program (sketch) ke arduino uno. Output dari PWM dihubungkan pada arduino melalui pin output analog. Dengan pengamatan menggunakan osiloskop dapat diketahui bahwa perubahan nilai ton dan toff menentukan nilai RPM dari motor DC yang dikontrol. Sehingga dengan menggunakan nilai PWM yang berbeda, variasi kecepatan motor DC juga berubah-ubah. Nilai PWM yang digunakan yaitu kelipatan 10 dari 25 hingga 255. Diperoleh hasil pengamatan berupa Ton dan Toff yang tertera pada osiloskop dan hasil pengamatan tersebut diolah untuk mengetahui duty cycle yang kemudian dibandingankan dengan PWM dan RPM nya. Sehingga dapat diketahui bahwa semakin besar nilai PWM maka RPM motor DC juga akan semakin besar, dan semakin besar nlai PWM yang diberikan, maka nilai duty cycle yang dihasilkan juga akan semakin besar

scholarly journals A Speed Control of DC Motor with PWM Using Microcontroller in Hardware in Loop

2018 ◽  
Vol 7 (3.27) ◽  
pp. 116
Author(s):  
S Reeba Rex ◽  
Mary ` Synthia Regis Praba2
Keyword(s):  
Duty Cycle ◽  
Pulse Width ◽  
Firefly Algorithm ◽  
Pulse Width Modulation ◽  
Speed Control ◽  
Dc Motor ◽  
Boost Converter ◽  
Motor Speed ◽  
Speed Controller ◽  
Hardware In Loop

This paper presents an implementation of a microcontroller based boost converter to maintain constant speed of a DC motor. The optimised values namely kp,ki,kd  of the  Boost Converter  are taken from firefly algorithm[10] and implemented using microcontroller. Pulse width modulation (PWM) is a procedure to generate changeable pulse width with different duty cycle. The PWM signal reduces the switching losses. This paper presents a DC motor speed controller where PID Controller is used where the optimized values of kp,ki,kd are taken from firefly algorithm[10]. The PWM pulse width will alter the speed of the motor.  The motor voltage and revolutions per seconds (RPS) obtained at different duty cycle rates. With increase in duty cycle, further voltage is applied to the motor. This gives stronger magnetic flux in the armature windings and to enhance revolutions per seconds. The characteristics and concert of the DC motor speed control system was discussed. In this paper, a PIC microcontroller is designed with a DC-DC boost converter for the motor speed controller system. Finally to improve the graphical result we design the hardware in loop method using matlab.  

Array DOA Estimation by the Model of Four Elements in Quare Array Based on the Theory of Compressed Sensing

2014 ◽  
Vol 635-637 ◽  
pp. 971-977 ◽  
Author(s):  
Rui Yuan ◽  
Jun Yue ◽  
Hong Xiu Gao
Keyword(s):  
Computer Simulation ◽  
Computational Complexity ◽  
Compressed Sensing ◽  
Matching Pursuit ◽  
Doa Estimation ◽  
Low Computational Complexity ◽  
Matching Pursuit Algorithm ◽  
Square Array

The DOA estimation by the model of four elements in the square array has studied based on the theory of compressed sensing. Using matching pursuit algorithm and orthogonality matching pursuit algorithm, the computer simulation was presented. The results show the method of DOA estimation by compressed sensing theory is simple, practical and low computational complexity.

scholarly journals Reporting for Duty: The duty cycle in Functional Electrical Stimulation research. Part I: Critical commentaries of the literature

2018 ◽  
Vol 28 (4) ◽  
Author(s):  
Matthew J. Taylor ◽  
Ché Fornusek ◽  
Andrew J. Ruys
Keyword(s):  
Electrical Stimulation ◽  
Muscle Contraction ◽  
Muscle Fatigue ◽  
Functional Electrical Stimulation ◽  
Duty Cycle ◽  
Cycle Time ◽  
Pulse Width ◽  
External Work ◽  
Stimulation Experiments ◽  
Frequency Pulse

There are several parameters that can be modulated during electrical stimulation-induced muscle contraction to obtain external work, i.e., Functional Electrical Stimulation (FES). The literature has several reports of the relationships of parameters such as frequency, pulse width, amplitude and physiological or biomechanical outcomes (i.e., torque) when these parameters are changed. While these relationships are well-described, lesser known across the literature is how changing the duty cycle (time ON and time OFF) of stimulation affects the outcomes. This review provides an analysis of the literature pertaining to the duty cycle in electrical stimulation experiments. There are two distinct sections of this review – an introduction to the duty cycle and definitions from literature (part I); and contentions from the literature and proposed frameworks upon which duty cycle can be interpreted (part II). It is envisaged that the two reviews will highlight the importance of modulating the duty cycle in terms of muscle fatigue in mimicking physiological activities. The frameworks provided will ideally assist in unifying how researchers consider the duty cycle in electrical stimulation (ES) of muscles.

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