14,171 Hits in 9.1 sec

Time-Modulated Transmissive Programmable Metasurface for Low Sidelobe Beam Scanning

Xudong Bai, Fuli Zhang, Li Sun, Anjie Cao, Jin Zhang, Chong He, Longhai Liu, Jianquan Yao, Weiren Zhu
2022 Research  
In this manuscript, a time modulation strategy is introduced in the 1-bit transmissive programmable metasurface for reducing the SLLs of the generated patterns.  ...  Through the high-speed modulation of the real-time periodic coding sequences on the metasurface by the programmable bias circuit, the equivalent phase shift accuracy to each metasurface unit can be improved  ...  Acknowledgments The authors acknowledge supports sponsored by the Shanghai Sailing Program (20YF1447000), the NWPU research fund for young scholars (G2022WD01008), the National Natural Science Foundation  ... 
doi:10.34133/2022/9825903 pmid:35928303 pmcid:PMC9297726 fatcat:ro6grzostvay5ab5tu4zjonadm

A Fast-Convergent Modulation Integral Observer for Online Detection of the Fundamental and Harmonics in Grid-Connected Power Electronics Systems

Boli Chen, Gilberto Pin, Wai Man Ng, Thomas Parisini, Shu-Yuen Ron Hui
2017 IEEE transactions on power electronics  
This paper presents the operating principle of a new modulation function integral observer algorithm that offers a fast solution for the extraction of the fundamental current and the total harmonic current  ...  It has been tested with both simulations and practical measurements for extracting the total harmonic current in a highly efficient manner.  ...  Acknowledgement: This work was partially supported by the HK Research Grant Council under the Theme-based Research Fund T23-701/14-N.  ... 
doi:10.1109/tpel.2016.2570821 fatcat:j5bh34xeiralfdajv7vw5wvogq

High-Speed-Operation of All-Silicon Lumped-Electrode Modulator Integrated with Passive Equalizer

Yohei Sobu, Shinsuke Tanaka, Yu Tanaka
2020 IEICE transactions on electronics  
This paper reviews the recent progress for the high-speed operation of an all-Si PIN-RC modulator.  ...  In addition, the current only flows at the time of data transition. For this purpose, we use a PIN-diode phase shifter.  ...  Acknowledgments The authors would like to thank the colleagues in Fujitsu Limited.  ... 
doi:10.1587/transele.2019ocp0006 fatcat:egn7ff2wsvdh3fudiystws4ste

High speed test interface module using MEMS technology

Nabeeh Kandalaft, Ali Attaran, Rashid Rashizadeh
2015 Microelectronics and reliability  
115 Release Process Before the final release, the wafers are diced into individual dies. The sacrificial lay is then removed using oxygen plasma dry-etch process.  ...  The process is complete and samples are packaged at this step. Released Device [113]. 116 ____________________________________  ...  Pogo pin assemblies can also be designed for very high bandwidth connection.  ... 
doi:10.1016/j.microrel.2014.11.010 fatcat:hela63ims5fxjeu4df3ylumex4

A Polarization Modulator Unit for the Mid- and High-Frequency Telescopes of the LiteBIRD mission [article]

Fabio Columbro, Paolo de Bernardis, Luca Lamagna, Silvia Masi, Alessandro Paiella, Francesco Piacentini, Giampaolo Pisano
2021 arXiv   pre-print
high-frequency telescope (HFT) and for the mid-frequency telescope (MFT).  ...  In this proceeding we will present the design and expected performance of the LiteBIRD PMUs and testing performed on every PMU subsystem with a room-temperature rotating disk used as a stand-in for the  ...  The HWP diameters of MFT and HFT are 320 mm and 220 mm, respectively. The concept of the design is shown in Fig. 1 and is the same for both modulators with a scaling of the components.  ... 
arXiv:2101.05188v1 fatcat:f3nzkfwrynginf2tr3f66tkdwi

Model Design of Low-Pass Filter of Integrated Pulse Width Modulation for Aircraft System Optimization

Francis T. Omigbodun
2019 International Journal for Research in Applied Science and Engineering Technology  
A novel Arduino based prototype of an Aerospace system that takes in an analogue signal of a variable frequency and zero voltage to produces an analogue output via pulse width modulation (PWM) was design  ...  The research aims to design and build a system with an Arduino based prototype embedded in it, that takes in an analogue signal of a variable frequency and voltage between 0 and 5V, produces an analogue  ...  Since a capacitor opposes high-frequency signals with very little resistance, high-frequency signals pass through the capacitor.  ... 
doi:10.22214/ijraset.2019.6250 fatcat:bqlesyhkpnfenl3mgegotntioe

Epitaxially grown vertical junction phase shifters for improved modulation efficiency in silicon depletion-type modulators

S. Sharif Azadeh, S. Romero-García, F. Merget, A. Moscoso-Mártir, Nils von den Driesch, D. Buca, J. Witzens, Pavel Cheben, Jiří Čtyroký, Iñigo Molina-Fernández
2015 Integrated Optics: Physics and Simulations II  
Here, we propose a highly efficient silicon modulator based on a Mach-Zehnder Interferometer in which the doping profile of a vertical pin junction is precisely controlled by means of in-situ doping during  ...  High-speed silicon modulators based on the plasma effect in reverse-biased p(i)n junction phase shifters have been extensively investigated.  ...  Figure 1 (c) shows a cross section of a modulator translating the same concept in a vertical junction.  ... 
doi:10.1117/12.2178790 fatcat:vqam7hjmkbhfjldxq2jhvu6xya

Hitting the target: fragment screening with acousticin situco-crystallization of proteins plus fragment libraries on pin-mounted data-collection micromeshes

Xingyu Yin, Alexander Scalia, Ludmila Leroy, Christina M. Cuttitta, Gina M. Polizzo, Daniel L. Ericson, Christian G. Roessler, Olven Campos, Millie Y. Ma, Rakhi Agarwal, Rick Jackimowicz, Marc Allaire (+3 others)
2014 Acta Crystallographica Section D: Biological Crystallography  
The high speed of specimen preparation and the low consumption of fragment and protein allow the use of individual rather than pooled fragments.  ...  Consequently, the crystallization tray is in equilibrium with the reservoir before, during and after the transfer of protein, precipitant and fragment to the micromesh on which crystallization will occur  ...  RA and AMO provided the expressed protein. MA, CGR, AMO and ASS designed a related fragment-screening system that supports the current effort.  ... 
doi:10.1107/s1399004713034603 pmid:24816088 pmcid:PMC4014116 fatcat:zztoroyetzgz7c6zv7wbfu3kzm

Doppler Measurement of Modulated Light for High Speed Vehicles

Kookjin Sung, Manoranjan Majji
2022 Sensors  
Technical details associated with a novel relative motion sensor system are elaborated in the paper.  ...  A transimpedance amplifier (TIA) sensing circuit is employed to measure the Doppler shift exhibited by the amplitude modulated light sources on the moving platform.  ...  We also would like to express sincere gratitude to Distinguished John Junkins of Texas A&M University for providing authors with insightful advice and expertise that greatly assisted the research.  ... 
doi:10.3390/s22041444 pmid:35214346 pmcid:PMC8877685 fatcat:wgwyeaupxbe7rk5zgvit6bjxcu

Application of electrically invisible antennas to the Modulated Scatterer Technique

Dylan A. Crocker, Kristen M. Donnell
2013 2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)  
In an effort to improve the modulation depth of scatterers commonly used in MST, the concept of electrically invisible antennas is applied to the design of these scatterers and is the focus of this work  ...  Traditionally, MST scatterers consist of dipole antennas centrally loaded with a lumped element capable of modulation (commonly a PIN diode).  ...  Loading the dipole antenna with a PIN diode enables the dipole impedance to be (electronically) changed by modulating the PIN diode bias between a forward and reverse state in a controlled manner.  ... 
doi:10.1109/i2mtc.2013.6555446 dblp:conf/i2mtc/CrockerD13 fatcat:b3xup6ayyneavootczarvniiju


1995 International Journal of High Speed Electronics and Systems  
This information can assist researchers in identifying those areas which need improvement and application designers in selecting the most appropriate algorithm for a speci c application.  ...  Multi-chip modules are now required to achieve higher system speed and greater density than the traditional single chip packages mounted on printed circuit boards.  ...  Acknowledgments The authors would like to express their special thanks to Prof. Jun Dong Cho from Sung Kyun Kwan University, Korea for his very valuable suggestions while writing this paper.  ... 
doi:10.1142/s0129156495000122 fatcat:7ol7t3odobfthjpafu53ixijtq

Development of advanced seed laser modules for lidar and spectroscopy applications

Narasimha S. Prasad, Alex Rosiewicz, Steve M. Coleman, Mark Dubinskii, Stephen G. Post
2013 Laser Technology for Defense and Security IX  
We report on recent progress made in the development of highly compact, single mode, distributed feedback laser (DFB) seed laser modules with integrated drive electronics for lidar and spectroscopy applications  ...  The current tuning was performed at a rate of up to 200 kHz allowing rapid adjustment and dithering of the laser frequency.  ...  The design steps include: (a) development of high power (~100 mW) , novel, 12xx nm wavelength DFB laser chips compatible with the package and drive electronics, (b) fabricate 14-pin butterfly DFB laser  ... 
doi:10.1117/12.2018195 fatcat:teieplroabdtbmvwm6qiie6agq

Miniaturised "Low Profile" module integrated converter for photovoltaic applications with integrated magnetic components

M. Meinhardt, T. O'Donnell, H. Schneider, J. Flannery, C.O. Mathuna, P. Zacharias, T. Krieger
1999 APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285)  
The presented "Low Profile Design" of a MIC has almost twice the power density and a 70% longer lifetime than commercially available MICs.  ...  The leakage inductance of planar transformers with integrated windings can be adjusted very precisely.  ...  Nevertheless in the future central inverter concepts will still be used especially in very large-scale PV systems.  ... 
doi:10.1109/apec.1999.749656 fatcat:jekktbf3onggvmkkkfuf3bhaxi

Modelling Challenges towards Virtual Prototyping of SiC based Power Modules

Ulrike Grossner
2017 Journal of The Japan Institute of Electronics Packaging  
Currently, power electronics on both academic and industrial level is experiencing a major change in the essential building block of all power electronic systems, the actual semiconductor device.  ...  Whereas silicon (Si) based switches and diodes have dominated the research, development, and application from small discrete devices to large high-power modules since its beginning, in the recent years  ...  Furthermore, the estimation of the stray inductance with a very high accuracy, the order of 1 nH, is required as new three dimensional (3D) power module structures with integrated decoupling capacitors  ... 
doi:10.5104/jiep.20.432 fatcat:d3xpxxqmzngqjjni62vt5tiagi

A Time-of-Flight Range Image Sensor With Background Canceling Lock-in Pixels Based on Lateral Electric Field Charge Modulation

Sang-Man Han, Taishi Takasawa, Keita Yasutomi, Satoshi Aoyama, Keiichiro Kagawa, Shoji Kawahito
2015 IEEE Journal of the Electron Devices Society  
The proposed lock-in pixel uses MOS gate-induced lateral electric field control of depleted potential of pinned photodiode for implementing a multiple-tap charge modulator while achieving a high-speed  ...  The effectiveness of in-pixel background light canceling with a three-tap output pixel is demonstrated.  ...  Photo electrons generated in the deep inside of Si substrate move very slowly through thermal diffusion.  ... 
doi:10.1109/jeds.2014.2382689 fatcat:bccsxg7wojhbdmv4cc57a5b634
« Previous Showing results 1 — 15 out of 14,171 results