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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 mode-locked surface acoustic wave oscillator for sensor applications

    Publication Year: 2002, Page(s):255 - 259
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (414 KB) | HTML iconHTML

    We present an alternative technique, the mode-locked surface acoustic wave (SAW) oscillator, to measure the response of a SAW delay line sensor. In contrast to a conventional CW-oscillator, all oscillator modes which meet the oscillation condition are excited. Thus the oscillator becomes a pulse oscillator with a repetition rate given by the delay time of the SAW device. Instead of the RF-frequenc... 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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  • Solution-concentration sensor using ultrasonic light diffraction effect

    Publication Year: 2002, Page(s):248 - 254
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (471 KB) | HTML iconHTML

    Describes the workings of an innovative solution-concentration sensor using an acousto-optic effect. We concentrate here on the sensitivity characteristics for NaCl and sucrose solutions over a range of ultrasonic frequencies (fa) (9-30 MHz) on which Raman-Nath diffraction occurs. The concentration of NaCl solutions (0-20.0%) has been measured with a sensitivity of 35.20 mV/% at f... 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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  • An analysis of plate surface roughness effect for AT-cut resonators

    Publication Year: 2002, Page(s):242 - 247
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (339 KB) | HTML iconHTML

    This paper describes the theoretical analysis regarding the resonance frequency and electrical equivalent circuit constants characteristics vs. plate surface roughnesses for the AT-cut resonators which are adsorbing and without adsorbing for relative humidity. A new electric equivalent circuit theory was proposed, and the experimental proof was conducted by means of both the impedance analyzer and... 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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  • A high-resolution DLL-based digital-to-time converter for DDS applications

    Publication Year: 2002, Page(s):649 - 653
    Cited by:  Papers (6)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (330 KB) | HTML iconHTML

    A Digital-to-Time Converter (DTC) based on a Delay-Locked Loop (DLL) for phase interpolation in Direct Digital Synthesis (DDS) applications is described. The conversion is made in two steps using digitally controllable delay cells with configurable shunt-capacitors load. The circuit is able to interpolate a 120 MHz clock, generating a delay proportional to an 8-bit digital control word with 32 ps ... View full abstract»

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  • Generalized acoustic parameters of non-homogeneous thin films

    Publication Year: 2002, Page(s):234 - 241
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (471 KB) | HTML iconHTML

    The transmission line model (TLM), which is based on a one-dimensional electromechanical model of acoustic wave generation and propagation in a multilayer arrangement of piezoelectric and non-piezoelectric layers, is one of the most developed methods for the analysis of the transduction mechanism of acoustic wave sensors. It especially contains the mass sensitivity of quartz crystal resonators kno... View full abstract»

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  • Second-order frequency shifts in crystal resonators under relatively large biasing fields

    Publication Year: 2002, Page(s):103 - 110
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (458 KB) | HTML iconHTML

    Frequency shifts in crystal resonators under relatively large biasing fields are studied from a perturbation procedure based on the equations for small fields superposed on finite biasing fields in an anisotropic elastic body. A general expression for second-order frequency shifts is obtained. Estimates are made on the order of magnitude of second-order frequency shifts in a quartz resonator due t... View full abstract»

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  • Composite structure of piezoelectric quartz resonator

    Publication Year: 2002, Page(s):136 - 140
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (407 KB) | HTML iconHTML

    In this paper, we present the experimental results and behavior of the composite structure of piezoelectric quartz resonators. The aim of the study is precise determination of the properties of a thin ferroelectric PbTiO3 layer using a dynamical method of measurement. The composite resonator is based on the X90°-cut quartz plano-parallel 10 MHz resonator (the diameter of 14.0 mm and... View full abstract»

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  • Sapphire loaded cavity microwave oscillator with improved temperature stability

    Publication Year: 2002, Page(s):572 - 579
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (462 KB) | HTML iconHTML

    Poor frequency-temperature stability of sapphire "whispering gallery" resonators (SWGR) is the main drawback of modern ultra-low phase noise room-temperature microwave sources using such resonators. This paper describes a novel dual-mode oscillator temperature control network where an auxiliary RF reference signal is formed by output frequency division. It eliminates the additional RF source and s... View full abstract»

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  • Pipeline-efficient hybrid vectoring implementation

    Publication Year: 2002, Page(s):643 - 648
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (449 KB) | HTML iconHTML

    Silicon area, power consumption and pipeline-efficiency are investigated for hardware implementations of a Cartesian-to-polar (i.e. both magnitude and phase) coordinate transformer (C2P). A novel hybrid scheme, consisting of both look-up and algorithmic constituents, is proposed, based on the VECTORING mode of the COordinate Rotation DIgital Computer (CORDIC) hardware algorithm, preceded by a prin... View full abstract»

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  • High-Q whispering modes in spherical cavity resonators

    Publication Year: 2002, Page(s):548 - 552
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (375 KB) | HTML iconHTML

    This work presents the study of high order modes in spherical cavity resonators. In general there exists mode families, degenerate in frequency, that "whisper" around the spherical surface. We call these Whispering Spherical (WS) mode sets. Each set comprises the well-known Whispering Gallery (WG) mode, which propagates like a ray around the azimuth. Also, we identify a new mode, which we label th... View full abstract»

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  • Chemical milling of quartz using a solution based on organic solvents and anhydrous hydrofluoric acid

    Publication Year: 2002, Page(s):394 - 402
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB) | HTML iconHTML

    The use of hydrofluoric acid solution in chemically milling, etching and polishing quartz has been accepted for many years. Several papers have been presented addressing aqueous HF solutions. In this paper the use of a solution based on organic solvents and anhydrous HF to chemically mill or etch mesa structures in quartz plates is investigated. The etch rate figures and how they are affected by t... View full abstract»

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  • SAW reflectivity and resonator results for LGT and LGN

    Publication Year: 2002, Page(s):324 - 327
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (350 KB) | HTML iconHTML

    SAW properties are currently being investigated for the use of LGN and LGT materials. Current efforts are focused on the measurement of SAW reflectivity and resonator performance. This paper will present recent results of SAW reflectivity for various cuts and propagation directions on LGT and LGN. The measurement procedure and the parameter extraction method for the reflectivity will be discussed.... View full abstract»

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  • 620 MHz AT-cut fundamental crystal resonator

    Publication Year: 2002, Page(s):174 - 178
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (317 KB) | HTML iconHTML

    This study succeeded in making 620 MHz AT-cut fundamental resonators, which used inverted mesa blanks of approximately 2.5 μm thickness, produced by a uniquely developed dry etching process using magnetron plasma. The electrode of this resonator is aluminum with has similar gravity to the crystal (2.65), and the blank is put into 7.5 mm×5.0 mm and 5.0 mm×3.2 mm ceramic packages. A v... View full abstract»

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  • Layer guided shear horizontal acoustic plate mode sensors

    Publication Year: 2002, Page(s):225 - 233
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (655 KB) | HTML iconHTML

    A dispersion equation is derived for shear horizontally polarized acoustic waves propagating on a finite thickness substrate covered by a finite thickness guiding layer with a shear acoustic speed less than that of the substrate. It is shown that the equation has two types of solution corresponding to traditional Love waves and to shear horizontally polarized acoustic plate modes (SH-APMs). Numeri... View full abstract»

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  • Electrically forced thickness-shear vibration of a crystal plate under time-dependent biasing deformations

    Publication Year: 2002, Page(s):96 - 102
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (407 KB) | HTML iconHTML

    Electrically forced thickness-shear vibrations of a Y-cut quartz plate resonator under time-dependent extensional biasing vibrations are studied using the two-dimensional equations for small deformations superposed on finite biasing deformations in electroelastic plates. It is shown that the thickness-shear vibration is governed by the well known Mathieu equation with a time-dependent coefficient ... View full abstract»

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