622MHz high frequency fundamental composite crystal resonator with an air-gapped electrode

Umeki, Mitoshi; Sato, Takayuki; Uehara, Hiroshi; Okazaki, M.

doi:10.1109/freq.2004.1418481

Cited by 10 publications

(7 citation statements)

References 1 publication

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“…This technique allows manufacturing very thin quartz crystals resonators but need lot of effort to manufacture and processing, therefore not economically viable solutions to date. Umeki et.al [38] proposed 622 MHz double inverted Mesa air-gapped resonator in which blank mounting and electrode are connected by metal alloy and wire using direct bonding technology (Fig. 2).…”

Section: A High Frequency Quartz Crystal Resonatormentioning

confidence: 99%

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A novel voltage controlled high frequency crystal oscillator circuits

Rohde

Poddar

2009

2009 9th International Conference on Telecommunication in Modern Satellite, Cable, and Broadcasting Services

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We report an active mode-coupled 622 MHz crystal oscillator circuit as a cost-effective alternative of surface acoustic wave (SAW) resonator oscillator. Experimental evaluation of the implemented active mode-coupling mechanism shows that the latter may provide a superior performance in comparison with commercially available expensive SAW resonator based reference frequency standards. The typical measured phase noise for 622 MHz voltage controlled crystal oscillator (VCXO) at 10 kHz offset is better than -156 dBc/Hz with operating DC bias of 8 V and 23 mA.

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Section: A High Frequency Quartz Crystal Resonatormentioning

confidence: 99%

“…Reducing the wafer thickness beyond certain limit makes fragile resonators. And, quartz wafer have reached their technological limit in terms of the operating frequency under the constraints of cost and reliability [37], [38].…”

Section: A High Frequency Quartz Crystal Resonatormentioning

confidence: 99%

A novel voltage controlled high frequency crystal oscillator circuits

Rohde

Poddar

2009

2009 9th International Conference on Telecommunication in Modern Satellite, Cable, and Broadcasting Services

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“…In device applications, unattached electrodes at some distance from the plate surfaces have been occasionally used [19][20][21]. Unattached or separated electrodes offer new design parameters and certain advantages over electrodes deposited on the plate surfaces.…”

Section: Introductionmentioning

confidence: 99%

Propagation of thickness-twist waves in a piezoelectric ceramic plate with unattached electrodes

2009

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“…In most cases, the electrodes are directly deposited on the surface of the piezoelectric structure. Unattached electrodes at some distance from the surface have been occasionally used in piezoelectric devices [5][6][7] . There are limited theoretical results on devices with unattached electrodes.…”

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confidence: 99%

Thickness-shear vibration of a circular cylindrical ceramic cylinder with unattached electrodes and air gaps

Yang¹,

Yang

Guo

et al. 2009

Sci. China Ser. G-Phys. Mech. Astron.

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We analyze thickness-shear vibration of an axially poled circular cylindrical tube with unattached electrodes and air gaps. Both free and electrically forced vibrations are studied. Exact solutions are obtained from the equations of linear piezoelectricity. Resonant frequencies and the impedance of the transducer are calculated from the solution. Results show that the resonant frequencies are sensitive to the dimensions of the air gaps when the gaps are thin. The impedance depends strongly on the air gaps.vibration, cylindrical cylinder, piezoelectricity, air gap Circular cylindrical tubes of polarized ceramics are common structures for many piezoelectric devices. Examples include hydrophone [1] , transducer [2] , fluid sensor [3] , and power harvester [4] . The references are too numerous to enumerate. In most cases, the electrodes are directly deposited on the surface of the piezoelectric structure. Unattached electrodes at some distance from the surface have been occasionally used in piezoelectric devices [5][6][7] . There are limited theoretical results on devices with unattached electrodes. A formulation for waves in crystal plates was given in ref.[8] where materials of general anisotropy are considered and therefore the results are complicated. Numerical techniques had to be used to obtain quantitative results and only numerical results for the case of attached electrodes were presented. Ref.[9] is an approximate theoretical analysis on finite plates with unattached electrodes. In ref.[10] a theoretical analysis of thickness-shear vibration of a quartz plate was performed. Unattached electrodes offer certain advantages that are important for further improvement of device performance. Various undesirable effects of attached electrodes disappear when the electrodes are unattached. This includes, e.g., the residual stress in the electrodes, the frequency effect of electrode irregularity in manufacturing, and the field concentration at electrode edges. In this paper we analyze thickness-shear vibration of an axially poled circular cylindrical ceramic tube with unattached electrodes and air gaps. This problem includes the classical result in ref.[2] as a special case. Both free and electrically forced vibrations are studied.

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622MHz high frequency fundamental composite crystal resonator with an air-gapped electrode

Cited by 10 publications

References 1 publication

A novel voltage controlled high frequency crystal oscillator circuits

A novel voltage controlled high frequency crystal oscillator circuits

Propagation of thickness-twist waves in a piezoelectric ceramic plate with unattached electrodes

Thickness-shear vibration of a circular cylindrical ceramic cylinder with unattached electrodes and air gaps

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