2014 European Frequency and Time Forum (EFTF)最新文献

{"title":"Low power MEMS oscillators for sensor applications","authors":"C. Do, A. Erbes, Jize Yan, A. Seshia","doi":"10.1109/EFTF.2014.7331527","DOIUrl":"https://doi.org/10.1109/EFTF.2014.7331527","url":null,"abstract":"In this paper, we report on the design of a low power CMOS oscillator front-end interface circuit for micromachined resonant sensors. The circuits are fabricated in a standard 0.35 μm process while the MEMS resonators are fabricated in a SOI-MEMS foundry process with the two die electrically integrated through wirebonding in a ceramic package. The oscillator core draws less than 1μA at 1.2V supply while demonstrating a short-term frequency stability of less than 0.5 ppm.","PeriodicalId":129873,"journal":{"name":"2014 European Frequency and Time Forum (EFTF)","volume":"2004 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125793171","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}

{"title":"The research on carrier phase time transfer of BeiDou navigation satellite system","authors":"Guang Wei, Zhang Pengfei, Y. Haibo, Li Wei, Zhang Qin, Huang Guanwen, Zhang Rui","doi":"10.1109/EFTF.2014.7331440","DOIUrl":"https://doi.org/10.1109/EFTF.2014.7331440","url":null,"abstract":"GPS/GLONASS Common view, all in view and PPP Time Transfer technology are widely used in the remote time comparison. With the benefit of the high precise measurement on carrier phase, the PPP time transfer technology which based on the carrier phase data has been used in the International time comparison for TAI computation. In this Paper, The Carrier Phase Time Transfer on BeiDou Navigation satellite system (BDS) is implemented. The technology is referenced with GPS carrier phase time transfer method Precise Point Position (PPP) and combined with dual-frequency observation from the BeiDou Navigation Satellite system. The broadcast ephemeris and precise orbits and clock data are used for calculation and comparison. The performance of this time transfer technology is analyzed on the respect of precise, frequency accuracy and stability. Compared with the BDS Common View and GPS Common View, the result of BeiDou carrier phase time transfer is verified and shows its better performance.","PeriodicalId":129873,"journal":{"name":"2014 European Frequency and Time Forum (EFTF)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126404227","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}

{"title":"Noise suppression for the precise measurement of Fabry-Perot cavity with wide tunable range","authors":"R. Smíd, M. Čížek, B. Mikel, J. Hrabina, J. Lazar, O. Cíp","doi":"10.1109/EFTF.2014.7331554","DOIUrl":"https://doi.org/10.1109/EFTF.2014.7331554","url":null,"abstract":"We present the method to suppress the frequency noise on a laser diode working at 1540 nm with wide tunable range (up to 2 nm). The noise suppression is made by an unbalanced heterodyne fiber interferometer. The frequency noise in our experiment has been suppressed by -20 dBc at Fourrier frequencies of 0-20 kHz and by more than 40 dB up to 300 Hz while the tunability range stayed untouched. The linewidth measurements show the decrease from 1.5 kHz to 300 Hz. By this method we were able to reach 10-12 uncertainty corresponding to 0.1 fm in cavity length and the tunable range of 100s of GHz corresponding to 1000s nm cavity length changes.","PeriodicalId":129873,"journal":{"name":"2014 European Frequency and Time Forum (EFTF)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123486593","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}

{"title":"Application of Lagrangian configuration to the analysis of electrostatically-driven MEMS resonators","authors":"L. Arapan, B. Dulmet","doi":"10.1109/EFTF.2014.7331490","DOIUrl":"https://doi.org/10.1109/EFTF.2014.7331490","url":null,"abstract":"This paper proposes an example of application of Lagrange configuration to the modelling of the electrostatically- driven vibrations of a silicon bar in flexure modes. Mapping an acousto-elastic problem onto the material coordinates of a well-known reference configuration is appropriate to analyze problems in finite deformation and is an excellent tool to model electrostatically-driven MEMS resonators. The paper presents an application of this approach to the analysis of a flexural resonator.","PeriodicalId":129873,"journal":{"name":"2014 European Frequency and Time Forum (EFTF)","volume":"151 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116525540","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}

{"title":"High frequency-low loss SAW resonators built on NanoCrystalline Diamond-based substrate","authors":"L. Braun, P. Boillot, S. Renaud, E. Girardet, G. Martin, R. Salut, W. Daniau, C. Gesset, P. Bergonzo, S. Saada, E. Courjon, T. Laroche, S. Ballandras, S. Desgrez, L. Raynaud, K. A. Aissa, O. Legrani, F. Sarry, B. Vincent, O. El Mazria, S. Laurent, J. Nallatamby","doi":"10.1109/EFTF.2014.7331482","DOIUrl":"https://doi.org/10.1109/EFTF.2014.7331482","url":null,"abstract":"The interest of surface acoustic wave devices (SAW) operating in radio-frequency range is their very high compactness, low losses and high quality factor. Thus, they are very interesting components for the stabilization of ultra-low noise on-board oscillators operating in direct bands. The need for working frequency beyond 3 GHz has lead SAW manufacturers to develop multilayer diamond-based waveguides providing higher phase velocity than conventional single-crystal materials, typically ranging from 7 to 12 km.s-1 for elliptically polarized waves. The very problem in this approach is the excitation and detection of acoustic waves requiring a high quality piezoelectric layer of less than one micrometer thick with physical properties as close as possible to the tabulated ones. An ultimate control of the film thickness and roughness is required to control dispersion and diffusion losses. In this work, we investigated a structure based on Nano-Crystalline Diamond (NCD). The waves are launched and detected using a Zinc Oxide film deposited atop the diamond layer, yielding notable dispersive properties of the device. In this way, technological developments have been achieved (NCD growth, piezoelectric layer deposition, e-beam and optical lithography) to build SAW devices taking advantage of NCD films to try and benefit from their suspected low acoustic damping. Results show the possibility of developing devices operating between 2 and 3 GHz at minimum, having losses lower than 10 dB. At last, devices whose dimensions are compatible with conventional lithography processes, show resonances at more than 4 GHz with less than 8 dB of insertion loss, what is, at the knowledge of the authors, the best experimental result for such devices. To compare with previous results, a device operating near 3 GHz has been used to stabilize an oscillator. Short term stability has been measured at 10-8 s-1 and a phase noise floor was observed at -170 dB at 3 MHz from the carrier. Although not yet meeting the expected requirements, these results show the impact of loss reduction and general device improvement and allow for preparing future work near 5 GHz.","PeriodicalId":129873,"journal":{"name":"2014 European Frequency and Time Forum (EFTF)","volume":"5 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120993623","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}

{"title":"High-frequency piezoelectric-on-Si MEMS resonator and numerical method for parameter extraction","authors":"A. Erbes, A. Prasad, A. Seshia","doi":"10.1109/EFTF.2014.7331493","DOIUrl":"https://doi.org/10.1109/EFTF.2014.7331493","url":null,"abstract":"This paper presents the design and characterization of a piezoelectrically-transduced (AlN) on silicon micro-mechanical resonator operating in its lateral bulk acoustic width-extensional mode at 28.73 MHz. The equivalent m-BVD model of the resonator is extracted using a least-squares-error algorithm which is presented in this paper. We report a mechanical Q factor of 5970 and motional resistance Rx of 273 Ω in vacuum (p0 = 30 mTorr) for the fundamental bulk acoustic mode for a 240 μm × 149 μm resonator. A good fit between the m-BVD model and the experimental data is obtained using the numerical fitting algorithm.","PeriodicalId":129873,"journal":{"name":"2014 European Frequency and Time Forum (EFTF)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125778495","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}

{"title":"Nonstationarities in space clocks: Investigations on experimental data","authors":"A. Cernigliaro, G. Fantino, I. Sesia, P. Tavella, L. Galleani","doi":"10.1109/EFTF.2014.7331443","DOIUrl":"https://doi.org/10.1109/EFTF.2014.7331443","url":null,"abstract":"Atomic clocks employed onboard satellites are one of the basic elements of Global Navigation Satellite Systems (GNSS). The positioning accuracy is highly dependent on these space clocks, whose stability is essential to ensure adequate performances. Monitoring and analyzing the behavior of space clocks is hence a fundamental task. Any nonstationarity, namely, any deviation of the clock behavior from the specifications, must be detected and communicated to the system users within a few seconds. In this paper we analyze more than five years of public satellite clock data for GPS, GLONASS and Galileo, obtained from the Information Analytical Centre and the International GNSS Service, including the Multi-GNSS Experiment. We evaluate and compare the stability of the system clocks under stationary behavior, namely, when the clocks behave according to the specifications. Then we classify the most evident clock apparent anomalies and we analyze them with tools specifically designed for clock nonstationarities, such as the dynamic Allan variance. Our goal is to understand the nature of every type of nonstationarity, and, eventually, to build a statistics of the most frequent ones.","PeriodicalId":129873,"journal":{"name":"2014 European Frequency and Time Forum (EFTF)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130170585","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}

{"title":"Spectroscopy in a micro-fabricated Rb cell with anti-relaxation wall-coating","authors":"M. Pellaton, C. Affolderbach, G. Mileti, R. Straessle, Y. Petremand, D. Briand, N. D. de Rooij","doi":"10.1109/EFTF.2014.7331561","DOIUrl":"https://doi.org/10.1109/EFTF.2014.7331561","url":null,"abstract":"We report on the realization and spectroscopic evaluation of a micro-fabricated Rb vapor cell equipped with an anti-relaxation OTS wall coating. By combining different spectroscopic results, we can exclude a hypothetical buffer-gas contamination of the cell as cause of the narrow double-resonance (DR) signals observed. We thus conclude that the narrow DR signal linewidth is due to the anti-relaxation wall-coating present in the cell. This realization presents interests in view of applications in miniaturized atomic devices such as atomic clocks, magnetometers, and others.","PeriodicalId":129873,"journal":{"name":"2014 European Frequency and Time Forum (EFTF)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116742269","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}

{"title":"A modification of Z12T metronome time transfer system","authors":"Shinn-Yan Lin, Yi Jiun Huang","doi":"10.1109/EFTF.2014.7331437","DOIUrl":"https://doi.org/10.1109/EFTF.2014.7331437","url":null,"abstract":"We modified one Z12-T Metronome geodesic GPS receiver time transfer station by adding a time interval counter (SR-620) to measure the time difference between its external reference 1 PPS and 20 MHz frequency inputs. The time differences were compensated into the pseudorange measurement of its RINEX file. In consequence, the reference time of the modified pseudorange of RINEX and REFGPS of CGGTTS are re-defined to be the system's external 1 PPS reference, no more its external 20 MHz frequency input.","PeriodicalId":129873,"journal":{"name":"2014 European Frequency and Time Forum (EFTF)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114823606","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}

{"title":"Time link calibration using two mobile TWSTFT stations for T2K experiment","authors":"M. Fujieda, T. Gotoh, R. Ichikawa, R. Tabuchi, M. Aida, K. Connolly, P. Destefano, N. Dreyer, J. Wilkes, C. Greenley, T. Kutter, O. Perevozchikov, C. Metelko, A. Weber, H. Berns, M. Dziewiecki, R. Kurjata, M. Ziembicki, Y. Hayato, E. Reinherz-Aronis, W. Toki, C. Bronner, K. Suzuki, T. Maruyama, K. Sakashita","doi":"10.1109/EFTF.2014.7331438","DOIUrl":"https://doi.org/10.1109/EFTF.2014.7331438","url":null,"abstract":"The T2K experiment uses GPS system to synchronize the timing between J-PARC (Tokai) and Super-Kamiokande (Kamioka). The GPS link was calibrated with 1-ns uncertainty by two mobile TWSTFT stations to improve the synchronization accuracy.","PeriodicalId":129873,"journal":{"name":"2014 European Frequency and Time Forum (EFTF)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128225124","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}