517 Hits in 5.2 sec

Blocker sets, orthogonal arrays and their application to combination locks

Alphonse Baartmans, Sharad Sane
2008 Discrete Mathematics  
The case k =2 that is three coordinate places (and small m) corresponds to the usual combination lock.  ...  The smallest size of a blocker set X will be denoted by (m, k) and the corresponding blocker set will be called a minimal blocker.  ...  This paper is intended to answer the above question from a very general stand point. Suppose we have a combination lock with m symbols and the combination lock has k + 1 coordinates.  ... 
doi:10.1016/j.disc.2006.06.051 fatcat:fxzuiixnjvehhies5kfjpkgzby

A Four-Channel Beamforming Down-Converter in 90-nm CMOS Utilizing Phase-Oversampling

Richard Tseng, Hao Li, Dae Hyun Kwon, Yun Chiu, Ada S. Y. Poon
2010 IEEE Journal of Solid-State Circuits  
the mixer outputs to perform beamforming weighting and combining.  ...  The beamformer demonstrates 24-dB blocker rejection for blockers impinging from different directions and 17-dB signal EVM improvement in the presence of an in-channel blocker.  ...  ACKNOWLEDGMENT The authors would like to thank D. Mast for his support during testing and DARPA TAPO for chip fabrication.  ... 
doi:10.1109/jssc.2010.2063971 fatcat:4cakiltpaba57emyexyz6tw3z4

Programmable Active Mirror: A Scalable Decentralized Router

Austin Fikes, Parham P. Khial, Samir Nooshabadi, Ali Hajimiri
2020 IEEE transactions on microwave theory and techniques  
Architectural variations are presented, and their specific tradeoffs are discussed.  ...  This work proposes and demonstrates the scalable router array that eliminates the internal centralization of conventional arrays, unlocking scalability, and the potential for a system composed of spatially  ...  Abiri for his contribution to the integrated circuit digital interface and the members of the Caltech Holistic Integrated Circuits Lab for their help in determining a clear and complete approach for presenting  ... 
doi:10.1109/tmtt.2020.3042516 fatcat:bnsyw2lxojdtzfzg6hsje27qvm

A 0.6–4.0 GHz RF-Resampling Beamforming Receiver With Frequency-Scaling True-Time-Delays up to Three Carrier Cycles

Kalle Spoof, Mahwish Zahra, Vishnu Unnikrishnan, Kari Stadius, Marko Kosunen, Jussi Ryynanen
2020 IEEE Solid-State Circuits Letters  
This thesis consists of an overview and of the following publications which are referred to in the text by their Roman numerals.  ...  Figure 3 .1 shows a phased array that applied RF and LO phase-tuning architecture. RF and LO phase-tuning are good candidates for analog beamforming with their own set of advantages and challenges.  ...  These architectures have their own set of advantages, most popular among them being RF, LO and analog phase-tuning, and RF true-time-delay.  ... 
doi:10.1109/lssc.2020.3012654 fatcat:xg6ui7nnqrfpjlv47okwlcyj6q

mmWave communications for 5G: implementation challenges and advances

Lianming Li, Dongming Wang, Xiaokang Niu, Yuan Chai, Linhui Chen, Long He, Xu Wu, Fuchun Zheng, Tiejun Cui, Xiaohu You
2018 Science China Information Sciences  
To fully exploit the antenna array performance and achieve commercial success, it is important to realize the 5G mmWave system in an energy-and cost-efficient way with a small form factor.  ...  To compensate the heavy path loss and increase the communications capacity, phased array beamforming and massive multiple-input multiple-output (MIMO) techniques are employed at both the user equipment  ...  Note here to take advantage of dual-conversion transceiver structure, targeting at 60 GHz application, the VCO center frequency is set to 48 GHz.  ... 
doi:10.1007/s11432-017-9262-8 fatcat:iuy5ghgwk5eghp7usbouph7g4e

EVM-based Performance Evaluation of Co-channel Interference Mitigation using Spatial Filtering for Digital MIMO Receivers

Sajad Golabighezelahmad, Eric Klumperink, Bram Nauta
2020 2020 IEEE 92nd Vehicular Technology Conference (VTC2020-Fall)  
Digital Multiple-Input Multiple-Output (MIMO) receivers, exposed to strong co-channel interference, require high dynamic range Analog-to-Digital Converters (ADCs) and a highly linear RF front-end.  ...  The receiver is exposed to interference while using different QAM formats (16-QAM to 256-QAM).  ...  ACKNOWLEDGMENT The authors would like to thank Arnoud Rop and Gerard Wienk for measurement setup.  ... 
doi:10.1109/vtc2020-fall49728.2020.9348716 fatcat:azoqickuife5vexgbgecmimsne

Alpha and gamma oscillations characterize feedback and feedforward processing in monkey visual cortex

Timo van Kerkoerle, Matthew W. Self, Bruno Dagnino, Marie-Alice Gariel-Mathis, Jasper Poort, Chris van der Togt, Pieter R. Roelfsema
2014 Proceedings of the National Academy of Sciences of the United States of America  
We recorded from all layers of the primary visual cortex (V1) and found that γ-waves are initiated in input layer 4 and propagate to the deep and superficial layers of cortex, whereas α-waves propagate  ...  Furthermore, blocking NMDA receptors, thought to be involved in feedback processing, suppressed α while boosting γ.  ...  Agreement 339490 (to P.R.R.).  ... 
doi:10.1073/pnas.1402773111 pmid:25205811 pmcid:PMC4210002 fatcat:3gpps3wtsfc2zc5r5tfrs647a4


2021 2021 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)  
in addition to their cost advantage.  ...  a K/Ka-band transceiver for phased array satellite mobile ground terminal applications.  ...  Abstract: The Internet of things and low-power wireless devices encompass many protocols and standards, each optimized for their specific set of applications, with the unifying themes being battery-operation  ... 
doi:10.1109/rfic51843.2021.9490449 fatcat:wmoshjhq3nhxxljgu46qup325u

5-GHz CMOS wireless LANs

T.H. Lee, H. Samavati, H.R. Rategh
2002 IEEE transactions on microwave theory and techniques  
The receiver consumes 59 mW from a 1.8-V supply and occupies only 4 mm 2 of die area, in no small measure due to the use of fractal capacitors for ac coupling.  ...  Leakage out of the RF port from the local oscillators is under 87 dBm, and all synthesizer spurs are below the 70-dBm noise floor of the instrumentation used to measure them.  ...  ACKNOWLEDGMENT The authors are grateful to Agilent Technologies, Palo Alto, CA, for equipment, and to Cadence, San Jose, CA, and Tektronix, Beaverton, OR, for supplying the computer-aided design (CAD)  ... 
doi:10.1109/22.981280 fatcat:kilfpll5mvanvh2xchnuyyvjjq

RFIC 2020 Program

2020 2020 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)  
In addition, the bandwidth is around 7 GHz under different gain settings.  ...  With the use of injection locking and ILFM cascading, the harmonic rejection reaches to 57.7 dBc.  ...  The realized DDRM also employs IQ-interleaving, harmonic rejection, and dynamic biasing to improve its spectral purity, in-band linearity, and system efficiency.  ... 
doi:10.1109/rfic49505.2020.9218389 fatcat:fqkpw3oau5gzpoi3gscgb7kwhi

Short-Range, Wireless Interconnect within a Computing Chassis: Design Challenges

Patrick Chiang, Sirikarn Woracheewan, Charles Hu, Lei Guo, Rahul Khanna, Jay Nejedlo, Huaping Liu
2010 IEEE Design & Test of Computers  
Ultrawideband links make it possible to design a withinchassis wireless interconnect.  ...  things, an RF front end, LCD driver, video processor, CMOS image sensor, digital TV tuner, Bluetooth transceiver, Wi-Fi transceiver, flash memory card, specialized 3G/4G decoder, multimedia processor, and  ...  We thank Krishnamurthy Soumyanath, Randy Mooney, and Mohan Kumar for their support of this project, and we thank Mosis and LSI for their help and support of the chip fabrication and testing.  ... 
doi:10.1109/mdt.2010.56 fatcat:iwam3tewinaitpbwvi6eiog6wa

Top-down modulation of the retinal code via histaminergic neurons of the hypothalamus [article]

Rebekah A. Warwick, Serena Riccitelli, Alina S. Heukamp, Hadar Yaakov, Lea Ankri, Jonathan Mayzel, Noa Gilead, Reut Parness-Yossifon, Michal Rivlin-Etzion
2022 bioRxiv   pre-print
These cells exhibited broader directional tuning and gained responses to high motion velocities.  ...  Histamine application, or chemogenetic activation of histaminergic axons, altered spontaneous and light-evoked activity of various retinal ganglion cells (RGCs), including direction-selective RGCs.  ...  for custom viral production, Mark Shein-Idelson for sharing the framework for the visual stimulation GUI, Meital Oren-Suissa for using her confocal microscope, Efrat Solomon for help with histology, and  ... 
doi:10.1101/2022.04.26.489509 fatcat:u4cy76kiufeg5ovkslpzh2ayri

A droplet microfluidic system for sequential generation of lipid bilayers and transmembrane electrical recordings

Magdalena A. Czekalska, Tomasz S. Kaminski, Slawomir Jakiela, K. Tanuj Sapra, Hagan Bayley, Piotr Garstecki
2015 Lab on a Chip  
We report a droplet microfluidic system that automates the formation of lipid bilayers and allows for electrophysiological measurements and for an automated screening protocols in which the activity of  ...  for Polish Science grant VENTURES/2012-10/4 (to T.S.K.) and the START fellowship (to T.S.K.).  ...  The project is co-financed by the European Research Council Starting Grant 279647 (to P.G.) and the European Regional Development Fund under the Operational Programme Innovative Economy within the Foundation  ... 
doi:10.1039/c4lc00985a pmid:25412368 fatcat:jb6epmvu7zeidepqqnoftpgrdy

A 350 $\mu$W CMOS MSK Transmitter and 400 $\mu$W OOK Super-Regenerative Receiver for Medical Implant Communications

Jose L. Bohorquez, Anantha P. Chandrakasan, Joel L. Dawson
2009 IEEE Journal of Solid-State Circuits  
The transceiver is implemented in 90 nm CMOS and digitally tunes 24 MHz in frequency steps smaller than 2 kHz.  ...  This paper presents a 350 W FSK/MSK direct modulation transmitter and a 400 W OOK super-regenerative receiver (SRR) specifically optimized for medical implant communications.  ...  For example, to find the proper values of , the other capacitor banks are set to their midrange values and the relationship between and is found.  ... 
doi:10.1109/jssc.2009.2014728 fatcat:7xdrz7djmbh2xokvf4s5oc55pq

Terahertz Imaging and Sensing Applications With Silicon-Based Technologies

Philipp Hillger, Janusz Grzyb, Ritesh Jain, Ullrich R. Pfeiffer
2019 IEEE Transactions on Terahertz Science and Technology  
This paper reviews the progress in THz IC research and investigates several realizations of THz imaging and sensing applications with silicon-based components regarding their motivation, system performance  ...  new applications, methods, and algorithms.  ...  applications where the specification of solids behind infrared blocker materials is desired.  ... 
doi:10.1109/tthz.2018.2884852 fatcat:kh4lmd56ifguhbxn365z22clgm
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