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Proceedings of the 2002 IEEE International Frequency Control Symposium and PDA Exhibition (Cat. No.02CH37234)

31-31 May 2002

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  • Proceedings of the 2002 IEEE International Frequency Control Symposium and PDA Exhibition (Cat. No.02CH37234)

    Publication Year: 2002
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  • Cady award

    Publication Year: 2002, Page(s): 1
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  • I.I. Rabi Award

    Publication Year: 2002, Page(s): 1
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  • C.B. Sawyer Award

    Publication Year: 2002, Page(s): 1
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  • Juergen Standte Memorial Award

    Publication Year: 2002, Page(s): 1
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  • 2002 IEEE & PDA Awards: David P. Larsen Award

    Publication Year: 2002, Page(s): 1
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  • Author index

    Publication Year: 2002, Page(s):761 - 764
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  • A new synchronized ultra miniature rubidium oscillator

    Publication Year: 2002, Page(s):451 - 454
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (315 KB) | HTML iconHTML

    It is now possible to put a complete rubidium atomic clock together with a pulse per second generation fully synchronized to reference signal such as GPS/PPS time signal or any other signal extracted from telecom ISDN frame synchronization pulse inside a volume of 90 cm3. This new rubidium oscillator is disciplined to a PPS (pulse per second) reference signal. The relative stability of ... View full abstract»

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  • The role of localized rotational imbalance in drive level dependence phenomena

    Publication Year: 2002, Page(s):2 - 7
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (526 KB) | HTML iconHTML

    The motivation for this study comes from mode shape measurements made of a thickness shear quartz plate with a splatter accidentally attached during Cu deposition. The results show distinct flexural motions extending out to the blank edges in narrow bands. These flexural motions are not present for a clean blank. Finite element analysis calculations are performed for the motion of a contoured quar... View full abstract»

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  • High temperature stable super high electromechanical coupling SAW substrates and application for SAW devices

    Publication Year: 2002, Page(s):66 - 69
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (305 KB) | HTML iconHTML

    In this study, in order to improve the temperature coefficient of frequency (TCF), the propagation characteristics of SiO2/rotated Y-cut, X-propagating LiNbO3 leaky surface acoustic wave (SAW) substrates with a large electromechanical coupling coefficient (k2), zero attenuation and zero TCF are theoretically investigated. The results showed a large k2 of... View full abstract»

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  • An electrostatic light shutter for atomic fountain clocks

    Publication Year: 2002, Page(s):447 - 450
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (269 KB) | HTML iconHTML

    Most cesium fountain clocks built today operate in sequential steps where an atomic cloud is trapped, launched, interrogated and detected. Except for the interrogation, every other step requires laser beams to illuminate the atoms and produce fluorescence. The microwave interrogation is, on the other hand, severely disturbed by any fluorescence which produces a light shift on the atoms. Since it i... View full abstract»

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  • Method for measurement of the sensitivity of crystal resonators to repetitive stimuli

    Publication Year: 2002, Page(s):61 - 65
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (402 KB) | HTML iconHTML

    This paper describes a simple method for the measurement of the effect of periodic stimuli on the frequency of crystal resonators. The technique has been implemented for the measurement of both acceleration and pressure sensitivity. The system is based around a passive method that has been previously used for residual phase noise measurement. In the case of acceleration sensitivity measurement, th... View full abstract»

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  • An improvement in the temperature-compensated DDS

    Publication Year: 2002, Page(s):662 - 664
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (257 KB) | HTML iconHTML

    This paper shows an extension of the temperature-compensated DDS; now an independent (free-running) crystal oscillator generates a clock of the direct digital frequency synthesizer (DDS) instead of a dual-mode crystal oscillator (DMXO). An entirely digital compensation of the clock frequency versus temperature (f-T) dependency is used. Temperature sensing is done by the use of a DMXO employing fun... View full abstract»

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  • Performance of small-scale frequency references

    Publication Year: 2002, Page(s):442 - 446
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (362 KB) | HTML iconHTML

    We consider theoretically the expected performance of ultra-small vapor-cell frequency references with cell volumes below 1 mm3. The short-term stability is found to degrade as the size is reduced. The amount of degradation depends on whether a buffer gas or wall coating is used for the atomic confinement. Preliminary experimental results with all-optical excitation indicate that the at... View full abstract»

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  • Improving short and long term frequency stability of the opto-electronic oscillator

    Publication Year: 2002, Page(s):580 - 583
    Cited by:  Papers (24)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB) | HTML iconHTML

    For the first time, the high Q components of the optoelectronic oscillator, i.e. the optical fiber, and the narrow pass band microwave filter in the oscillator loop were thermally stabilized to improve the oscillator short- and long-term frequency stability. In our design, the temperature of these elements is kept above ambient and stabilized with the help of resistive heaters and temperature cont... View full abstract»

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  • Enhanced phase noise model for quartz crystal oscillators

    Publication Year: 2002, Page(s):627 - 632
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (383 KB) | HTML iconHTML

    Leeson's model is the basic model for predicting oscillator noise. G. Sauvage [1977] has proposed a mathematical analysis of this "heuristic" model. Both models do not detail the relative importance of the amplifier transfer function associated with its own noise in regard to the resonator. In this paper, an improved version of these previous models is presented. Amplifier noise and that caused by... View full abstract»

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  • Error bars for three-cornered-hats

    Publication Year: 2002, Page(s):721 - 724
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (333 KB) | HTML iconHTML

    The three-cornered-hat is a procedure for extracting the stabilities of three clocks when the only available information is the time or frequency differences between the clocks. To our knowledge, there has been no method of determining a confidence interval for such a stability estimate. In this paper, we present a method for determining the number of degrees of freedom of the estimate, which allo... View full abstract»

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  • Good resonance operating stabilities of piezoelectric SAW device structures using special perturbed multi-variable thermo-electromechanical finite element

    Publication Year: 2002, Page(s):78 - 84
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (501 KB) | HTML iconHTML

    Several highly nonlinear relations between disturbed surface acoustic wave (DSAW) and piezoelectric surface mount stress (PSMS) properties, temperature changes and electrode heights are computationally discovered, and quantitatively determined using a special new and effective perturbed multivariable thermal piezoelectric generalized plane strain finite element method (GPS FEM) with well-based shi... View full abstract»

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  • The arithmetic of 1/f noise in a phase locked loop

    Publication Year: 2002, Page(s):739 - 743
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (339 KB) | HTML iconHTML

    Frequency countings close to a phase locked zone in an electronic receiver show a 1/f power spectral density. The noise scaling versus the frequency deviation and the open loop gain is found from Adler's model of the phase locked loop. This fully agrees with experiments performed at 5 MHz on a receiver with a Schottky diode mixer and a low pass filter. The 1/f amplitude and frequency noise due to ... View full abstract»

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  • Visualization of mode shapes in piezoelectric devices using two-dimensional correlation filter

    Publication Year: 2002, Page(s):55 - 60
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB) | HTML iconHTML

    The method described here, based on laser speckle interferometry, applies a two-dimensional correlation filter to speckle image data for driven and resting phases, to visualize the mode shapes of piezoelectric devices. Laser speckle interference, a periodic resonator excitation, charge coupled device (CCD) image captures and correlation filtering are effectively combined in this method. Even with ... View full abstract»

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  • A new approach to the design of low power direct digital frequency synthesizers

    Publication Year: 2002, Page(s):654 - 661
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB) | HTML iconHTML

    This paper describes a new approach to the design of direct digital frequency synthesizers, based on the approximation of a sinusoid function with linear segments. The segments' slopes are restricted to a reduced set of values lending themselves to an efficient hardware realization. A genetic algorithm search technique follows to optimize the selection of segment parameters in order to maximize th... View full abstract»

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  • Analysis of noise mechanisms limiting frequency stability of microwave signals generated with a femtosecond laser

    Publication Year: 2002, Page(s):435 - 441
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (397 KB) | HTML iconHTML

    The femtosecond laser is a key element of a coherent link between optical and microwave domains. Such a link has already enabled measurements of optical frequencies with an accuracy of a current time standard, the caesium beam microwave 'clock' (S.A. Diddams et al., Phys. Rev. Lett. vol. 84, pp. 5102-5105, 2000; T. Udem et al., ibid., vol. 86, p. 4996, 2001). Making use of a femtosecond laser, it ... View full abstract»

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  • Low cost thin film based surface acoustic wave vibration sensors for vibrational gyroscope

    Publication Year: 2002, Page(s):220 - 224
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (347 KB) | HTML iconHTML

    Reports on the development of thin film polycrystalline zinc oxide based surface acoustic wave (SAW) resonators for use as vibration sensors on a novel low cost vibrating gyroscope structure intended for use in a GPS-INS automotive navigation system. Piezoelectric growth conditions and layer configurations are optimised to produce resonators with the high Q factor (>4000) required to detect kHz fr... View full abstract»

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  • Growth of piezoelectric aluminium nitride for layered SAW devices

    Publication Year: 2002, Page(s):333 - 336
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB) | HTML iconHTML

    A piezoelectric film combined with a high velocity substrate such as diamond seems very promising for SAW devices operating at high frequencies. In this work, we investigate the optimisation of growth parameters to produce AlN films with required properties for SAW devices: high resistivity, low roughness and good piezoelectricity coupling. AlN films are deposited by reactive DC magnetron sputteri... View full abstract»

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  • Modeling and simulation of the thin film bulk acoustic resonator

    Publication Year: 2002, Page(s):40 - 44
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB) | HTML iconHTML

    This paper describes the modeling and simulation results for thin film BAW resonators. We present the frequency tuning mechanisms, the influence of the thickness of the electrodes and Q of the resonator. The BAW resonator was fabricated with the piezoelectric thin film and Bragg reflector. View full abstract»

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