333 Hits in 9.8 sec

Synchronization for Subsampling Digital UWB Receiver: a Holistic Approach

Yves Vanderperren, Geert Leus, Wim Dehaene
2007 2007 IEEE International Conference on Ultra-Wideband  
This paper evaluates in AWGN and dense multipath environments several time acquisition algorithms for digital pulsed UWB receivers sampling below Nyquist Rate for high speed communication.  ...  The authors gratefully thank Jeff Weintraub from Xilinx for prompt tool support.  ...  For the sake of simplicity, we assume that the code is used to modulate the amplitude of the pulses (DS-UWB), not their position.  ... 
doi:10.1109/icuwb.2007.4381059 fatcat:lwfygqrabnaa5lufogh4d7rque

Coded exposure photography

Ramesh Raskar, Amit Agrawal, Jack Tumblin
2006 ACM Transactions on Graphics  
(b) User clicks on four points to rectify the motion lines and specifies a rough crop. (c) Deblurred result. Note that all sharp features on the vehicle (such as text) have been recovered.  ...  a) Blurred Image (b) Rectified Crop (c) Deblurred Image Figure 1: Coded exposure enables recovery of fine details in the deblurred image. (a) Photo of a fast moving vehicle.  ...  We also thank Hideaki Nii, Joe Marks, Joseph Katz and Rama Chellappa for helpful discussions and support.  ... 
doi:10.1145/1141911.1141957 fatcat:oyomx53n2jfx7l4nu6dk3wef4e

CMOS Analog Front-End IC for Gas Sensors

Hyuntae Kim, Bertan Bakkaloglu
2011 Additional Conferences (Device Packaging, HiTEC, HiTEN, & CICMT)  
With digital offset storage and nested chopping, the readout chain achieves 500 µV input referred offset. iii ACKNOWLEDGEMENTS First of all, thank you very much, God.  ...  The IC consists of a low noise potentiostat, and associated 9bit current-steering DAC for sensor stimulus, followed by the first order nested chopped Σ∆ ADC.  ...  In other words, no two consecutive outputs of the modulator have the same digital code.  ... 
doi:10.4071/2011dpc-wp25 fatcat:k6lqrnkh3rhmdklep3w2qa3ioe

Fast chopper for single radio-frequency quadrupole bunch selection for neutron time-of-flight capabilities

Asher Shor, Boaz Kaizer, Ilan Eliyahu, Tsviki Hirsh, Yossi Eisen, Arik Kreisel, Leo Weissman, Amichay Perry, Israel Mardor, Shlomi Halfon, Eli Farber, Gitai Feinberg (+6 others)
2019 Physical Review Accelerators and Beams  
Fast neutron TOF capabilities, especially at phase II of SARAF, will provide exceptional opportunities for neutron induced reaction measurements for nuclear technology and fundamental research.  ...  Presently, the system enables single bunch selection for protons and deuterons at a repetition rate as determined by the user of up to 200 kHz, with bunch transmission of up to 50%, and with neighboring  ...  We also thank the FP7-SPIRAL2PP project for the design, construction and test of the slow chopper that was used in this study.  ... 
doi:10.1103/physrevaccelbeams.22.020403 fatcat:zlglcwsb2veazdeezfw6e4fiqm

NeuralTree: A 256-Channel 0.227uJ/class Versatile Neural Activity Classification and Closed-Loop Neuromodulation SoC [article]

Uisub Shin, Cong Ding, Bingzhao Zhu, Yashwanth Vyza, Alix Trouillet, Emilie C. M. Revol, Stéphanie P. Lacour, Mahsa Shoaran
2022 arXiv   pre-print
While high-density neural recording can provide rich neural activity information for accurate disease-state detection, existing systems have low channel count and poor scalability, which could limit their  ...  A 16-channel high-voltage (HV) compliant neurostimulator closes the therapeutic loop by delivering charge-balanced biphasic current pulses to the brain.  ...  ACKNOWLEDGMENT The authors acknowledge Ivan Furfaro for his contribution to the in-vivo experimental setup.  ... 
arXiv:2205.06090v2 fatcat:l5heb52alvhyblpopbokxa2kpq

2019 Index IEEE Transactions on Circuits and Systems I: Regular Papers Vol. 66

2019 IEEE Transactions on Circuits and Systems Part 1: Regular Papers  
., +, TCSI March 2019 1153-1165 Line Coding Techniques for Channel Equalization: Integrated Pulse-Width Modulation and Consecutive Digit Chopping.  ...  Krestinskaya, O., +, TCSI Feb. 2019 719-732 Line Coding Techniques for Channel Equalization: Integrated Pulse-Width Modulation and Consecutive Digit Chopping.  ... 
doi:10.1109/tcsi.2020.2966967 fatcat:f663jj5g45e3peggn3gwn5jys4

Coded exposure photography

Ramesh Raskar, Amit Agrawal, Jack Tumblin
2006 ACM SIGGRAPH 2006 Papers on - SIGGRAPH '06  
(b) User clicks on four points to rectify the motion lines and specifies a rough crop. (c) Deblurred result. Note that all sharp features on the vehicle (such as text) have been recovered.  ...  Rather than leaving the shutter open for the entire exposure duration, we "flutter" the camera's shutter open and closed during the chosen exposure time with a binary pseudo-random sequence.  ...  We also thank Hideaki Nii, Joe Marks, Joseph Katz and Rama Chellappa for helpful discussions and support.  ... 
doi:10.1145/1179352.1141957 fatcat:cudnkcr2fndwnhpdeh4j4ib4t4

The Philosophy of PCM

B.M. Oliver, J.R. Pierce, C.E. Shannon
1948 Proceedings of the IRE  
However, all these higher order harmonics must fold (alias) back into the Nyquist bandwidth and sum together to produce an rms noise equal to q/√ 12.  ...  The equation of the sawtooth error is given by The mean-square value of e(t) can be written: Performing the simple integration and simplifying, The root-mean-square quantization error is therefore Figure  ...  Also for communications applications, the AD9446 16-bit, 100 MSPS ADC is optimized for high SNR (84 dB), dissipates 2.8 W, and is also designed on a BiCMOS process.  ... 
doi:10.1109/jrproc.1948.231941 fatcat:n5mzm7dp45cojmrmzpanr5zv2y

Bandpass Delta-Sigma Converters in IF Receivers [chapter]

Armond Hairapetian
2001 Analog Circuit Design  
The front cover also symbolizes the vast amount of building blocks that is required to built such a sophisticated mobile device, and illustrates that integration is key to be able to decrease the volume  ...  It also represents four of the five quality indicators named above: robustness, efficiency (low-power), accuracy (the highly-digitized receiver architecture requires a high resolution ADC) and flexibility  ...  If these current sources are not equal, chopping can be used to make them equal. The technique is patented in [32] , [33] .  ... 
doi:10.1007/978-1-4613-1443-1_10 fatcat:cg34vk7z65cgleckvjw5lbhiqe

Basic Telephony [chapter]

2005 Telecommunication System Engineering  
The advice and strategies contained herein may not be suitable for your situation. You should consult with a professional where appropriate.  ...  completeness of the contents of this book and specifically disclaim any implied warranties of merchantability or fitness for a particular purpose.  ...  BASIS OF PULSE-CODE MODULATION Pulse-code modulation is a method of modulation in which a continuous analog wave is transmitted in an equivalent digital mode.  ... 
doi:10.1002/0471728489.ch1 fatcat:rgsftd3davaj3gitme4j66l7ly

Design Improvements on Fast, High-Order, Incremental Sigma-Delta ADCs for Low-Noise Stacked CMOS Image Sensors

Luis Miguel Carvalho Freitas, Fernando Morgado-Dias
2021 Electronics  
Modern CMOS imaging devices are present everywhere, in the form of line, area and depth scanners.  ...  converters with noise shaping capabilities (to provide low noise output digital samples—74 μVrms; 0.7 e−rms; at 105 μV/e−), and thus performing correlated double sampling in a short time (19 μs), while  ...  The equivalent amount of photo-generated charges is related to the current pulse amplitude and pulse width.  ... 
doi:10.3390/electronics10161936 fatcat:64ju6myqvfgahbnokes3ifwxaq

Control of switched reluctance machines

2009 2009 35th Annual Conference of IEEE Industrial Electronics  
Finally, three closed-loop generator control strategies aimed at high speed operation in single pulse mode are developed.  ...  Marissa Condon, for all her guidance, advice and support throughout the duration of this project. Many thanks to Jim Dowling for his help and support during my time in DCU.  ...  Popular methods of current control include voltage Pulse Width Modulation (voltage PWM), current hysteresis and delta modulation.  ... 
doi:10.1109/iecon.2009.5415317 fatcat:yyyqj2euojf3zdh7rrnhpbb2sa

A new method of measuring the half-life of ^10C [article]

K. K. H. Leung
2009 arXiv   pre-print
The 10C decay belongs to the set of superallowed 0+ -> 0+ beta-decays whose Ft values offer stringent tests of the Conserved Vector Current (CVC) hypothesis and which can be used in calculating |Vud|,  ...  This study highlights the significance of systematic errors due to high count rates in precision half-life experiments and raises doubts about both the two previously accepted values of the half-life of  ...  Ability to distinguish consecutive events is determined by the width of the pulses in time which is around 25ns in our detectors.  ... 
arXiv:0911.5325v1 fatcat:rwmxm6ugozfibkdbg7t3k7femi

Two High-Sensitivity Pulsar Searches

David J Nice, Joseph H Taylor
1992 Zenodo  
We have undertaken a program of two searches at radio wavelengths for pulsars using the Arecibo Observatory.  ...  Of the remaining fifteen new pulsars, thirteen are relatively young, slow pulsars, with periods between 0.212 s and 5.094 s.  ...  Studies of individual pulses have shown that, while pulse-topulse variations of pulse shapes and intensities for a given pulsar can be large, the shape produced by summing many consecutive pulses is a  ... 
doi:10.5281/zenodo.49375 fatcat:46r3oqkxfzftlesm3sa65vqsfq


Christopher V Young, Mark A Cappelli
2016 Zenodo  
Hall thrusters are a mature form of electric propulsion for spacecraft well suited for north-south station keeping, orbit transfer maneuvers, and eventually deep space travel.  ...  The collection of plasma oscillations, instabilities, and turbulent fluctuations present in Hall thrusters make for rich electron and ion dynamic behavior that is the subject of this investigation.  ...  DG535 digital delay generator produces a TTL pulse (blue in Figs. 3.4 and 3.5b) of width τ and delayed by ∆t from the comparator trigger.  ... 
doi:10.5281/zenodo.3831450 fatcat:s5odd262ungjhastfo2ljxtlze
« Previous Showing results 1 — 15 out of 333 results