Searched for: subject:"lock"
(1 - 20 of 131)

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Chen, Peng (author), Zhang, Feifei (author), Zong, Z. (author), Hu, Suoping (author), Siriburanon, Teerachot (author), Staszewski, R.B. (author)
This article proposes a power-efficient highly linear capacitor-array-based digital-to-time converter (DTC) using a charge redistribution constant-slope approach. A fringe-capacitor-based digital-to-analog converter (C-DAC) array is used to regulate the starting supply voltage of the constant discharging slope fed to a fixed-threshold...
journal article 2019
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Eijlander, Sabine (author), Mulder, K.F. (author)
Global society is confronted with various challenges: climate change should be mitigated, and society should adapt to the impacts of climate change, resources will become scarcer and hence resources should be used more efficiently and recovered after use, the growing world population and its growing wealth create unprecedented emissions of...
journal article 2019
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Hendrikse, H. (author), Nord, Torodd S. (author)
Interaction of sea or lake ice with vertically sided offshore structures may result in severe structural vibrations commonly referred to as ice-induced vibrations. With the surge in offshore wind developments in sub-arctic regions this problem has received increased attention over the last decade, whereas traditionally the topic has been mainly...
journal article 2019
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Willems, Tom (author), Hendrikse, H. (author)
Offshore wind turbines at locations where sea or lake ice is present need to be designed to withstand ice-induced loading. For vertical-sided support structures, such as monopiles, the effects of ice-induced vibrations need to be considered in the design. Current practice is either to use approaches provided in design standards, or for example...
conference paper 2019
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Blanken, Micha (author), Verweij, Cees (author), Mulder, K.F. (author)
Innovations are required in urban infrastructures due to the pressing needs for mitigating climate change and prevent resource depletion. In order to address the slow pace of innovation in urban systems, this paper analyses factors involved in attempts to introduce novel sanitary systems. Today new requirements are important: sanitary systems...
journal article 2019
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Abramian, A. (author), Vakulenko, Sergei A. (author), van Horssen, W.T. (author)
In this paper, a new simple oscillator model is considered describing ice-induced vibrations of upstanding, water-surrounded, and bottom-founded offshore structures. Existing models are extended by taking into account deformations of an ice floe and a moving contact interaction between an ice rod, which is cut out from the floe, and the...
journal article 2019
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Zong, Z. (author), Chen, Peng (author), Staszewski, R.B. (author)
In this paper, we propose a 60-GHz fractional-N digital frequency synthesizer aimed at reducing its phase noise (PN) at both the flicker (1/f <sup>3</sup> ) and thermal (1/f <sup>2</sup> ) regions while minimizing its power consumption. The digitally controlled oscillator (DCO) fundamentally resonates at 20 GHz and co-generates a strong...
journal article 2019
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Hei, K. (author), Shi, Guang (author), Hänsel, A. (author), Deng, Z. (author), Latkowski, Sylwester (author), Van Den Berg, Steven A. (author), Bente, Erwin (author), Bhattacharya, N. (author)
The measurement of distance plays an integral part in many aspects of modern societies. In this paper an integrated mode-locked laser on a chip is used for distance measurement based on mode-resolved interferometry. The emission from the on-chip source with a repetition rate of 2.5 GHz and a spectral bandwidth of 3 nm is coupled into a...
journal article 2019
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Lee, Yongtae (author), Choi, Woojun (author), Kim, Taewoong (author), Song, Seungwoo (author), Makinwa, K.A.A. (author), Chae, Youngcheol (author)
This letter describes a compact resistor-based temperature sensor intended for the thermal monitoring of microprocessors and DRAMs. It consists of an RC poly phase filter (PPF) that is read out by a frequency-locked loop (FLL) based on a dual zero-crossing (ZC) detection scheme. The sensor, fabricated in 65-nm CMOS, occupies 5800 μm 2 and...
journal article 2019
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Hendrikse, H. (author), Koot, Jasper (author)
Ice-induced vibrations have to be considered in the design of vertically sided offshore structures which may encounter drifting sea or lake ice during their lifetime. One particular aspect is the contribution of ice-induced vibrations to the fatigue of such structures. Estimation of the duration of events is often difficult, due to limited...
conference paper 2019
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Hendrikse, H. (author)
The second edition of the ISO19906 design standard contains changes in the informative appendix concerning dynamic ice actions. Challenges in application of the previous approach and advances in understanding of the dynamic ice-structure interaction process were the main motivation for the revision. The new guideline provides relevant...
conference paper 2019
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Gao, Z. (author), Hu, Yizhe (author), Siriburanon, Teerachot (author), Staszewski, R.B. (author)
This paper proposes a mm-wave quadrature frequency generator using injection-locked harmonic extractors (HEs) incorporated with quadrature class-F oscillators. While maintaining high output levels at 28 GHz, the utilization of injection locking technique improves the effective quality ($Q$)-factor and helps to achieve a fundamental harmonic...
conference paper 2019
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Nord, Torodd S. (author), Samardžija, Ilija (author), Hendrikse, H. (author), Bjerkås, Morten (author), Høyland, Knut V. (author), Li, Hongtao (author)
The signature and occurrence of frequency lock-in (FLI) vibrations of full-scale offshore structures are not well understood. Although several structures have experienced FLI, limited amounts of time histories of the responses alongside measured met-ocean data are available in the literature. This paper presents an analysis of 61 measured...
journal article 2018
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Pesch, U. (author)
Purpose: The purpose of this paper is to introduce three storylines that address the relation between economic growth, technical innovation and environmental impact. The paper assesses if and how these storylines as guiding visions increase our range of future orientations. Design/methodology/approach: The paper first explains its general...
journal article 2018
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Ding, Ming (author), Zhou, Zhihao (author), Liu, Yao-Hong (author), Traferro, Stefano (author), Bachmann, Christian (author), Philips, Kathleen (author), Sebastiano, F. (author)
A 40-nm CMOS wakeup timer employing a bang-bang digital-intensive frequency-locked loop for Internet-of-Things applications is presented. A self-biased ΣΔ digitally controlled oscillator (DCO) is locked to an RC time constant via a single-bit chopped comparator and a digital loop filter. Such highly digitized architecture fully exploits the...
journal article 2018
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Hendrikse, H. (author), Ziemer, G. (author), Owen, C.C. (author)
Vertically sided offshore structures subjected to level ice are designed to withstand the effects of ice-induced vibrations. Such structures are, for example, offshore wind turbines on monopile foundations, multi-legged oil- and gas platforms or lighthouses. For the prediction of dynamic interaction between ice and structures, several...
journal article 2018
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Pourmousavian, Naser (author), Kuo, Feng Wei (author), Siriburanon, Teerachot (author), Babaie, M. (author), Staszewski, R.B. (author)
This paper proposes an ultra-low-voltage (ULV) fractional-N all-digital PLL (ADPLL) powered from a single 0.5-V supply. While its digitally controlled oscillator (DCO) runs directly at 0.5 V, an internal switched-capacitor dc-dc converter ``doubles'' the supply voltage to all the digital circuitry and particularly regulates the time-to...
journal article 2018
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Choi, Woojun (author), Lee, Yongtae (author), Kim, Seonhong (author), Lee, Sanghoon (author), Jang, Jieun (author), Chun, Junhyun (author), Makinwa, K.A.A. (author), Chae, Youngcheol (author)
This paper presents a compact resistor-based CMOS temperature sensor intended for dense thermal monitoring. It is based on an RC poly-phase filter (PPF), whose temperature-dependent phase shift is read out by a frequency-locked loop (FLL). The PPF's phase shift is determined by a zero-crossing (ZC) detector, allowing the rest of the FLL to be...
journal article 2018
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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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Pennazza, Giorgio (author), Santonico, Marco (author), Vollero, Luca (author), Zompanti, A. (author), Sabatini, A. (author), Kumar, Nandeesh (author), Pini, Ivan (author), Quiros Solano, W.F. (author), Sarro, P.M. (author), D'Amico, Arnaldo (author)
This paper presents an advanced voltammetric system to be used as electronic tongue for liquid and gas analysis. It has been designed to be more flexible and accurate with respect to other existing and similar systems. It features improved electronics and additional operative conditions. Among others these include the possibility to optically...
journal article 2018
Searched for: subject:"lock"
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