Design and test of a pulse-width modulator and driver for space-borne GaN switch mode power amplifiers in P-band

2015 ◽  
Vol 7 (3-4) ◽  
pp. 297-305 ◽  
Author(s):  
I. S. Ghosh ◽  
U. Altmann ◽  
L. Cabria ◽  
E. Cipriani ◽  
P. Colantonio ◽  
...  
Keyword(s):  
High Power ◽  
Pulse Width ◽  
Three Dimensional ◽  
Buffer Size ◽  
Single Chip ◽  
Test Chip ◽  
Simulation Accuracy ◽  
Electromagnetic Simulations ◽  
Pulse Width Modulator ◽  
Power Stage

In this paper, the design and test of a single-chip RF pulse-width modulator and driver (PWMD) aimed at exciting a high-power class-E GaN high-power stage at 435 MHz is described. For the required buffer size, avoiding potential ringing of the pulses within the buffer structure presents a major challenge in the design process. Therefore, a smaller test chip capable of driving capacitive loads of up to 5 pF was initially designed, fabricated, and tested. An approach based on three-dimensional electromagnetic simulations was used to validate the test results and offers excellent simulation accuracy. Based on the results obtained for test chip an enlarged PWMD chip capable of driving a 40 W high-power stage has been designed and tested on passive loads representing the targeted final stage.

scholarly journals Increasing the time resolution of a pulse width modulator in a class D power amplifier by using delay lines

2014 ◽  
Vol 12 ◽  
pp. 91-94 ◽  
Author(s):  
M. Weber ◽  
T. Vennemann ◽  
W. Mathis
Keyword(s):  
Power Amplifier ◽  
Time Resolution ◽  
Pulse Width ◽  
Audio Signal ◽  
Open Loop ◽  
Delay Lines ◽  
Class D ◽  
Ac Power ◽  
Pulse Width Modulator ◽  
Power Stage

Abstract. In this paper, we present a method to increase the time resolution of a pulse width modulator by using delay lines. The modulator is part of an open loop class D power amplifier, which uses the ZePoC algorithm to code the audio signal which is amplified in the class D power stage. If the time resolution of the pulse width modulator is high enough, ZePoC could also be used to build an high accuracy AC power standard, because of its open loop property. With the presented method the time resolution theoretically could be increased by a factor of 16, which means here the time resolution will be enhanced from 5 ns to 312.5 ps.

Design of Digital-High-Power LAB Charger

2011 ◽  
Vol 311-313 ◽  
pp. 2401-2404
Author(s):  
Ju Fang Hu ◽  
Chun Ru Xiong ◽  
Rui Min Tao ◽  
Run Yang Zhong
Keyword(s):  
High Power ◽  
Pulse Width ◽  
Control Method ◽  
Design Method ◽  
Control Unit ◽  
External Circuit ◽  
Lead Acid Battery ◽  
Pulse Width Modulator ◽  
Charging Control ◽  
The One

This paper proposes a design method how to realize a digital-high-power (DHP) lead-acid battery (LAB) charger. The main control unit P89LPC933 real-time collects the voltage and current of the charger. Then the unit sends out the control signal to pulse width modulator SG3525A, controlling the voltage and current. It co-operates the external circuit as well. This paper innovatively proposes 4-stage charging control method and strategy. This paper compares the typical chargers on the market with the one proposed by the authors in terms of horizontal and vertical dimension.

scholarly journals Effect of Voltage Pulse Width and Synchronized Substrate Bias in High-Power Impulse Magnetron Sputtering of Zirconium Films

Coatings ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 7
Author(s):  
Chin-Chiuan Kuo ◽  
Chun-Hui Lin ◽  
Jing-Tang Chang ◽  
Yu-Tse Lin
Keyword(s):  
Growth Rate ◽  
Magnetron Sputtering ◽  
High Power ◽  
Pulse Width ◽  
Film Growth ◽  
Highly Charged Ions ◽  
Argon Pressure ◽  
Hexagonal Prism ◽  
Film Growth Rate ◽  
Charged Ions

The Zr film microstructure is highly influenced by the energy of the plasma species during the deposition process. The influences of the discharge pulse width, which is the key factor affecting ionization of sputtered species in the high-power impulse magnetron sputtering (HiPIMS) process, on the obtained microstructure of films is investigated in this research. The films deposited at different argon pressure and substrate biasing are compared. With keeping the same average HiPIMS power and duty cycle, the film growth rate of the Zr film decreases with increasing argon pressure and enhancing substrate biasing. In addition, the film growth rate decreases with the elongating HiPIMS pulse width. For the deposition at 1.2 Pa argon, extending the pulse width not only intensifies the ion flux toward the substrate but also increases the fraction of highly charged ions, which alter the microstructure of films from individual hexagonal prism columns into a tightly connected irregular column. Increasing film density leads to higher hardness. Sufficient synchronized negative substrate biasing and longer pulse width, which supports higher mobility of adatoms, causes the preferred orientation of hexagonal α-phase Zr films from (0 0 0 2) to (1 0 1¯ 1). Unlike the deposition at 1.2 Pa, highly charged ions are also found during the short HiPIMS pulse width at 0.8 Pa argon.

An asynchronous pulse width modulator for DC‐DC buck converter

2019 ◽  
Vol 48 (2) ◽  
pp. 231-253 ◽  
Author(s):  
Reza Inanlou ◽  
Omid Shoaei ◽  
Mohsen Tamaddon
Keyword(s):  
Pulse Width ◽  
Buck Converter ◽  
Pulse Width Modulator

scholarly journals Three-Dimensional Arterial Pulse Signal Acquisition in Time Domain Using Flexible Pressure-Sensor Dense Arrays

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 569
Author(s):  
Jianzhong Chen ◽  
Ke Sun ◽  
Rong Zheng ◽  
Yi Sun ◽  
Heng Yang ◽  
...  
Keyword(s):  
Radial Artery ◽  
Pressure Sensor ◽  
Pulse Width ◽  
Printed Circuit Boards ◽  
Color Doppler ◽  
Three Dimensional ◽  
Pressure Sensors ◽  
Sensor Arrays ◽  
Signal Acquisition ◽  
Dynamic Pulse

In this study, we developed a radial artery pulse acquisition system based on finger-worn dense pressure sensor arrays to enable three-dimensional pulse signals acquisition. The finger-worn dense pressure-sensor arrays were fabricated by packaging 18 ultra-small MEMS pressure sensors (0.4 mm × 0.4 mm × 0.2 mm each) with a pitch of 0.65 mm on flexible printed circuit boards. Pulse signals are measured and recorded simultaneously when traditional Chinese medicine practitioners wear the arrays on the fingers while palpating the radial pulse. Given that the pitches are much smaller than the diameter of the human radial artery, three-dimensional pulse envelope images can be measured with the system, as can the width and the dynamic width of the pulse signals. Furthermore, the array has an effective span of 11.6 mm—3–5 times the diameter of the radial artery—which enables easy and accurate positioning of the sensor array on the radial artery. This study also outlines proposed methods for measuring the pulse width and dynamic pulse width. The dynamic pulse widths of three volunteers were measured, and the dynamic pulse width measurements were consistent with those obtained by color Doppler ultrasound. The pulse wave velocity can also be measured with the system by measuring the pulse transit time between the pulse signals at the brachial and radial arteries using the finger-worn sensor arrays.

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