Searched for: subject:"locks"
(1 - 20 of 111)

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Kislaya, A. (author), Sciacchitano, A. (author)

The use of optical diffusers for the reduction of peak-locking errors in particle image velocimetry is investigated. The working principle of the optical diffusers is based on the concept of birefringence, where the incoming rays are subject to different deflections depending on the light direction and polarization. The performances of the...

journal article 2018
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Bashir, I. (author), Staszewski, R.B. (author), Balsara, P.T. (author)

We present a numerical model of a wideband injection-locked frequency modulator used in a polar transmitter for 3G cellular radio application. At the heart of the system is a self-injection-locked oscillator with a programmable linear tuning range of up to 200 MHz at 4-GHz oscillation frequency. The oscillator is injection locked to a time...

journal article 2017
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Ronchini Ximenes, A. (author), Vlachogiannakis, G. (author), Staszewski, R.B. (author)
In this paper, we apply various area reduction techniques on an inductor–capacitor (LC)-tank oscillator in order to make its size comparable to that of ring oscillators (ROs), while still retaining its salient features of excellent phase noise and low sensitivity to supply variations. The resulting oscillator employs a proposed ultracompact...
journal article 2017
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Hendrikse, H. (author), Seidel, Marc (author), Metrikine, A. (author), Loset, Sveinung (author)
Ice-induced vibrations have to be considered in design of vertically sided offshore structures subjected to loading by sea ice, such as offshore wind turbines and oil- and gas platforms. The interaction between ice and structure may result in high global peak loads and the occurring structural vibrations can contribute significantly to the...
conference paper 2017
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Bessas, D. (author), Brück, E.H. (author)

The assembly of a Lock-In digital Amplifier (LIdA) from widely accessible ready-made modules is presented. This equipment, which does not require any advanced knowledge of electronics or programming, may introduce the experimenter to resonant techniques by registering mechanical resonances. The freely available control program allows for...

journal article 2017
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Shahmohammadi, M. (author)
doctoral thesis 2016
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Babaie, M. (author)
doctoral thesis 2016
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Zong, Z. (author), Babaie, M. (author), Staszewski, R.B. (author)
This paper proposes a mm-wave frequency generation technique that improves its phase noise (PN) performance and power efficiency. The main idea is that a fundamental 20 GHz signal and its sufficiently strong third harmonic at 60 GHz are generated simultaneously in a single oscillator. The desired 60 GHz local oscillator (LO) signal is delivered...
journal article 2016
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Asveld, L. (author)
The policies of the European Union concerning the development of biofuels can be termed a lock-in. Biofuels were initially hailed as a green, sustainability technology. However evidence to the contrary quickly emerged. The European Commission proposed to alter its policies to accommodate for these effects but met with fierce resistance from a...
journal article 2016
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Read, S.A. (author), Lindhult, Erik (author)
Transition of energy systems has been under-theorised. We have argued previously that energy efficiency as a strategy for fossil fuel replacement is inadequate as energy demand is not being reduced by efficiency alone. This paper is intended to elaborate further on the reasons. We require better answers to better questions about the nature of...
conference paper 2016
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Babaie, M. (author), Kuo, F.W. (author), Chen, H (author), Cho, L.C. (author), Jou, C.P. (author), Hsueh, F.L. (author), Shahmohammadi, M. (author), Staszewski, R.B. (author)
We propose a new transmitter architecture for ultra-low power radios in which the most energy-hungry RF circuits operate at a supply just above a threshold voltage of CMOS transistors. An all-digital PLL employs a digitally controlled oscillator with switching current sources to reduce supply voltage and power without sacrificing its startup...
journal article 2016
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Van Marrewijk, N. (author), Mirzaei, B. (author), Hayton, D. (author), Gao, J.R. (author), Kao, T.Y. (author), Hu, Q. (author), Reno, J.L. (author)
We have performed frequency locking of a dual, forward reverse emitting third-order distributed feedback quantum cascade laser (QCL) at 3.5 THz. By using both directions of THz emission in combination with two gas cells and two power detectors, we can for the first time perform frequency stabilization, while monitor the frequency locking quality...
journal article 2015
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Bergen, J.P. (author)
Conceiving of nuclear energy as a social experiment gives rise to the question of what to do when the experiment is no longer responsible or desirable. To be able to appropriately respond to such a situation, the nuclear energy technology in question should be reversible, i.e. it must be possible to stop its further development and...
journal article 2015
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Ahmadi Mehr, S.A.R. (author), Tohidian, M. (author), Staszeski, R.B. (author)
In modern RF system on chips (SoCs), the digital content consumes up to 85% of the IC chip area. The recent push to integrate multiple RF-SoC cores is met with heavy resistance by the remaining RF/analog circuitry, which creates numerous strong aggressors and weak victims leading to RF performance degradation. A key such mechanism is injection...
journal article 2015
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Wu, W. (author), Staszewski, R.B. (author), Long, J.R. (author)
A mm-wave digital transmitter based on a 60 GHz all-digital phase-locked loop (ADPLL) with wideband frequency modulation (FM) for FMCW radar applications is proposed. The fractional-N ADPLL employs a high-resolution 60 GHz digitally controlled oscillator (DCO) and is capable of multi-rate two-point FM. It achieves a measured rms jitter of 590.2...
journal article 2014
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Zhuang, J. (author), Staszewski, R.B. (author)
This paper presents an all-digital phase-locked loop (ADPLL) architecture in a new light that allows it to significantly save power through complexity reduction of its phase locking and detection mechanisms. The natural predictive nature of the ADPLL to estimate next edge occurrence of the reference clock is exploited here to reduce the timing...
journal article 2014
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Wang, H.Z. (author), Zou, Z.J. (author)
In this paper, a numerical study on the behaviours of a ship passing through a lock under the influence of a berthed ship is carried out. The viscous flow and hydrodynamic forces are calculated by applying an unsteady RANS code with a RNG k-å turbulence model. UDF is compiled to define the ship motion. The numerical results are obtained and...
conference paper 2013
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Hayton, D.J. (author), Khudchenko, A. (author), Pavelyev, D.G. (author), Hovenier, J.N. (author), Baryshev, A. (author), Gao, J.R. (author), Kao, T.Y. (author), Hu, Q. (author), Reno, J.L. (author), Vaks, V. (author)
We report on the phase locking of a 3.4 THz third-order distributed feedback quantum cascade laser (QCL) using a room temperature GaAs/AlAs superlattice diode as both a frequency multiplier and an internal harmonic mixer. A signal-to-noise level of 60?dB is observed in the intermediate frequency signal between the 18th harmonic of a 190.7?GHz...
journal article 2013
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Cantarelli, C.C. (author), Flyvbjerg, B. (author), Van Wee, G.P. (author), Molin, E.J.E. (author)
Een belangrijk fenomeen dat kostenoverschrijdingen kan verklaren is lock-in. We definiëren lockin als de buitenmatige verbondenheid van besluitmakers aan een inefficiënt besluit. Dit kan op twee manieren invloed hebben op de mate van kostenoverschrijdingen. Ten eerste methodologisch: kostenoverschrijdingen worden berekend op basis van de...
journal article 2012
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Kashmiri, S.M. (author)
In recent years, a lot of research has been devoted to the realization of accurate integrated frequency references. A thermal-diffusivity-based (TD) frequency reference provides an alternative method of on-chip frequency generation in standard CMOS technology. A frequency-locked loop locks the output frequency of an oscillator to the accurate...
doctoral thesis 2012
Searched for: subject:"locks"
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