2012 European Frequency and Time Forum最新文献_第9页

Time-to-Digit Converter Based on radiation-tolerant FPGA 基于耐辐射FPGA的时间-数字转换器

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502384

M. Peca, M. Vacek, V. Michálek

{"title":"Time-to-Digit Converter Based on radiation-tolerant FPGA","authors":"M. Peca, M. Vacek, V. Michálek","doi":"10.1109/EFTF.2012.6502384","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502384","url":null,"abstract":"Architecture of a time-to-digit converter (TDC) is presented. TDC is an electronic device which measures time of arrival of discrete electronic pulses, with respect to reference time base. Our work on TDC is motivated by its applications in field of long-range laser distance measurement and time synchronization. Unlike earlier time interpolation methods, we have chosen all-digital approach based on pulse propagation through tapped delay line. We do not expect it could outperform recent invention of time interpolation using narrow-band filter excitation [1], [2]. However, our approach relies on a standard digital circuitry only. With space applications in mind, we are implementing the TDC into a space qualified, radiation-tolerant field-programmable gate array (FPGA). On top of related works [4] and [5] on all-digital TDCs, delay line, we try to gather more complete information about the sampled pulse. It is done by sampling of whole bit vector, corresponding to all of the delay line taps. A calibration method based on random pulse source is discussed, including preliminary results. Impact of physical FPGA cell placement on resulting time measurement granularity is observed. Actually measured jitter distribution is compared to normal distribution function, giving an insight of absolute accuracy limit of our approach within the given FPGA platform.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"42 1","pages":"286-289"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88479429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Wall-coated cells for Rb atomic clocks: Study of the ripening process by double-resonance spectroscopy 铷原子钟壁包细胞:用双共振光谱研究成熟过程

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502340

M. Pellaton, C. Affolderbach, G. Mileti, R. Straessle, D. Briand, N. D. de Rooij

引用次数: 1

Compact Hz-level linewidth laser system 紧凑的赫兹级线宽激光系统

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502361

E. Portuondo-Campa, S. Kundermann, S. Lecomte

引用次数: 0

Direct comparison of two Cryocooled Sapphire Oscillators presenting relative frequency instability at 10−15 直接比较在10 - 15时相对频率不稳定的两个冷冻蓝宝石振荡器

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502380

S. Grop, B. Dubois, J. Masson, P. Bourgeois, Y. Kersalé, E. Rubiola, G. Haye, V. Giordano

引用次数: 1

Improvement of comparisons between T2L2 & RF links 改进了T2L2和RF链路之间的比较

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502398

P. Guillemot, P. Laurent, J. Achkar, D. Rovera, E. Samain, P. Exertier, S. Leon

引用次数: 1

Estimation of COMPASS on-board clock short-term stability 罗盘星载时钟短期稳定性的估计

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502407

H. Gong, Shaojie Ni, Weihua Mou, Xiangwei Zhu, Feixue Wang

引用次数: 3

Towards the detection of high-contrast Cs CPT resonances using a single modulated diode laser 利用单调制二极管激光器探测高对比度CPT共振

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502388

X. Liu, E. Kroemer, J. Merolla, R. Boudot

引用次数: 1

Investigation of drive level dependencies of higher overtones in SC quartz resonators SC石英谐振器中高泛音驱动电平依赖性的研究

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502372

V. Stofanik, Z. Brezović, M. Minárik

{"title":"Investigation of drive level dependencies of higher overtones in SC quartz resonators","authors":"V. Stofanik, Z. Brezović, M. Minárik","doi":"10.1109/EFTF.2012.6502372","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502372","url":null,"abstract":"In this paper we illustrate our experimental investigations of drive level dependencies of two higher overtones (the 5th and the 7th ones), as well as of the main mode (the 3rd overtone) of several different stress compensated (SC) quartz resonators. The drive level dependencies of basic parameters in the simple Butterworth-Van Dyke one-port equivalent circuit of the particular mode were derived from the impedance vs. frequency responses measured in the vicinity of the particular modes, while temperature of the investigated resonator was maintained approximately at the lower turnover point temperature of the main mode. In the 3rd overtone 10-MHz SC quartz resonators, for example, the 5th overtone or the 7th overtone (the c-modes, i.e. the slow thickness-shear modes of vibration) can be exited simultaneously along with the main c-mode, with assistance of an appropriate dual-mode or multi-mode crystal oscillator (DMXO or MMXO); and the resonator self-temperature-sensing can be reliably implemented [1], [2], [3]. Level of amplitudes of particular modes, which are simultaneously excited in DMXO or MMXO, has impact on short-term, as well as on long-term frequency instabilities of generated signals; hence drive levels of individual c-modes have to be set-up properly in the oscillator circuit.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"20 1","pages":"227-234"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80884512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

About time measurements 关于时间测量

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502406

M. Siccardi, M. Abgrall, G. Rovera

引用次数: 5

Optical frequency link between Torino and Firenze for remote comparison between Yb and Sr optical clocks 都灵和佛罗伦萨之间的光学频率链路，用于远程比较Yb和Sr光学时钟

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502410

D. Calonico, C. Clivati, G. Costanzo, A. Godone, F. Levi, Marco Marchetti, A. Mura, M. Prevedelli, M. Schioppo, G. Tino, M. Zucco, N. Poli

引用次数: 4