Results 151 to 160 of about 4,538 (207)
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Oven controlled FBAR oscillator
2015 IEEE International Ultrasonics Symposium (IUS), 2015Recent work with chip scale integrated FBAR oscillators has highlighted the fact that the temperature sensitivity is similar to SAW resonators. This sensitivity is significantly higher than quartz crystal oscillators, and limits the application of the technology. This investigation looks at the feasibility of stabilizing the frequency of the oscillator
R. Ruby +3 more
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FBAR laterally Coupled Resonator Filter
2015 IEEE International Ultrasonics Symposium (IUS), 2015A very attractive CRF (Coupled Resonator Filter) topology is to laterally couple thin film bulk acoustic resonators (FBAR). However, the filter band width is narrow because the coupling between conventional FBAR resonators is very weak. The coupling, and thus the bandwidth, may be increased by forming pairs of FBAR with an inter-digital coupling ...
null Kun Wang +4 more
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Impedance of DC-bias-controlled composite FBARs
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2013A closed-form analytic formula is derived for composite resonators consisting of two layers of paraelectricphase ferroelectrics. It is used to analyze the properties of these resonators. Under an applied dc electric field, the layers exhibit an induced piezoelectric effect.
Spartak, Gevorgian, Andrei, Vorobiev
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FBAR filters at GHz frequencies
44th Annual Symposium on Frequency Control, 2002Film bulk acoustic resonator (FBAR) technology, which is used for the design and fabrication of microwave filters, is discussed. Filters are presented which exhibit a combination of low loss, small size, and frequency and bandwidth not attainable by any other type of device.
C. Vale +4 more
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2013
In this chapter, the conventional models of acoustic resonators, such as Mason, KLM, and Lakin, are considered as a general background and possibility of their application (with adequate modifications) for modelling of the tuneable FBARs. In ferroelectric-based tuneable FBARs, the basic parameters, stiffness, acoustic velocity, and relative dielectric ...
Spartak Gevorgian +2 more
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In this chapter, the conventional models of acoustic resonators, such as Mason, KLM, and Lakin, are considered as a general background and possibility of their application (with adequate modifications) for modelling of the tuneable FBARs. In ferroelectric-based tuneable FBARs, the basic parameters, stiffness, acoustic velocity, and relative dielectric ...
Spartak Gevorgian +2 more
openaire +1 more source
Novel flexible FBAR on PET substrate
2014 IEEE International Conference on Electron Devices and Solid-State Circuits, 2014A novel flexible Film Bulk Acoustic Wave Resonators (FBARs) based on ZnO/PET structure was fabricated without back-etch. The PET layer is applied as acoustic reflector and substrate of FBAR. It has 1.14GHz parallel resonant frequency, 1.229GHz series resonant frequency and about 150 Q factors.
N.N. Hu +5 more
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2013
In this chapter, the basic design features of intrinsically tuneable FBARs are considered focusing on the Bragg reflectors for the solidly mounted resonators. Effects of the electrodes and other layers on the tuneable performance of the FBARs including tuneability, Q-factor, and electromechanical coupling coefficient are also addressed.
Spartak Gevorgian +2 more
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In this chapter, the basic design features of intrinsically tuneable FBARs are considered focusing on the Bragg reflectors for the solidly mounted resonators. Effects of the electrodes and other layers on the tuneable performance of the FBARs including tuneability, Q-factor, and electromechanical coupling coefficient are also addressed.
Spartak Gevorgian +2 more
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Tunable FBARs: Intrinsic vs. extrinsic tunability
2012 IEEE/MTT-S International Microwave Symposium Digest, 2012The methods used to make the Film Bulk Acoustic Resonators (FBAR) tunable is reviewed. Intrinsically tunable FBARs make use ferroelectrics in ferroelectric and paraelectric (non-polar) phases have tunabilities up to 5% and more. Extrinsically tunable resonators are based on traditional piezoelectric FBARs and make use of external varactors and ...
S. Gevorgian, A. Vorobiev
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2012
FBAR is composed of piezoelectric film, electrodes and supporting layer or Bragg acoustic reflector. The performance of FBAR depends on the acoustic and electric properties of the materials. Based on the acoustic theory, we can deduce the plane-wave-propagating characteristics of the general elastic films and piezoelectric film in FBAR and then obtain ...
Yafei Zhang, Da Chen
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FBAR is composed of piezoelectric film, electrodes and supporting layer or Bragg acoustic reflector. The performance of FBAR depends on the acoustic and electric properties of the materials. Based on the acoustic theory, we can deduce the plane-wave-propagating characteristics of the general elastic films and piezoelectric film in FBAR and then obtain ...
Yafei Zhang, Da Chen
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A study on FBAR Filters reconfiguration
2005 12th IEEE International Conference on Electronics, Circuits and Systems, 2005This paper presents the possibilities to reconfigure the Film Bulk Acoustic Resonator (FBAR) Filters. We propose the addition of passive elements (L, C) to the FBAR. An augmentation of 35% to the bandwidth is found when adding inductances, and a reduction of 32% is established when using capacitances.
M. El Hassan +5 more
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