Laser probe system for 5 GHz SAW/BAW devices

Self Cite

This paper proposes a detection electronics which enables ultimate suppression of leakage signals in high-speed and phase-sensitive laser probe for radio frequency surface and bulk acoustic wave devices. Another merit is simpler circuit configuration than the conventional one. First, the complete suppression of leakage signals is verified. Then impact of the oscillator phase noise is examined by utilizing oscillators with various phase noise performance. This is because the proposed electronics is expected to be more sensitive to the oscillator phase noise than the conventional one. The result indicates that although performance degradation appears, it is practically negligible. In this electronics, the absolute phase can not be determined. This is not a demerit for use in the laser probe because additional phase shift caused by cables and printed circuit board is hard to calibrate.

Section: Conventional and Proposed Detection Electronicsmentioning

confidence: 99%

A detection electronics enabling ultimate suppression of leakage signals in high-speed and phase-sensitive laser probe for radio frequency surface and bulk acoustic wave devices

Yaginuma

Omori

Hashimoto

2021

Self Cite

“…Next, numerical data around the inner oval are extracted, the inverse 2D FFT is applied. 37,38) Figure 7 shows the result. It is clearly seen that the scattering is caused at the junctions between busbars of the IDT and those of Bragg reflectors.…”

Section: Wavenumber Domain Analysismentioning

confidence: 99%

3D FEM simulation of SAW resonators using hierarchical cascading technique and general purpose graphic processing unit

Bao

Qiu

et al. 2019

This paper proposes an application of a general purpose graphic processing unit (GPGPU) to the finite element method analysis based on the hierarchical cascading technique (HCT). It is proved that GPGPU can accelerate the HCT significantly, especially for large scale problems. Thanks to significant acceleration, full three-dimensional simulation is possible for practical surface acoustic wave (SAW) device structures. Besides admittance curve, the displacement field is calculated. It is shown that SAW scattering occurs at the boundary at busbar spaces between the interdigital transducer (IDT) and reflector regions.

“…The field distribution of TSBARs is calculated by applying the traceback technique 23) to the HCT-based full 3D FEM simulation, and its variation with W x /W y is studied in detail with assistance of the wavenumber domain analysis. 27,28) The result indicates that the mode conversion and wave leakage at bumps are origins of the Q factor deterioration for the traditional piston edges, and thus smaller W x /W y offers better Q factor. On the other hand, hybrid modes are generated by the mode conversion between fast and slow shear modes, and are apparent when W x /W y is small.…”

Section: Introductionmentioning

confidence: 99%

Field analyses of thickness shear bulk acoustic resonators with different electrode edge ratio using full three dimensional finite element method simulation

He¹,

Wong²,

Wu³

et al. 2022

Self Cite

This paper is aimed at revealing origins of spurious resonances and Q deterioration of thickness shear bulk acoustic resonators with the edge ratio Wx/Wy of rectangular electrodes by field analyses. Here, Wx and Wy are distances between side edges giving the broadband and standard piston designs, respectively. The field distribution is calculated by applying traceback technique to the full three-dimensional finite element method based on hierarchical cascading technique, its variation with the edge ratio is studied in detail in assistance with the wavenumber domain analysis. The result indicates that the mode conversion and leakage occur at the bump region causing Q reduction, and generated hybrid modes cause spurious resonances. The former is significant when Wx/Wy is large when the latter becomes obvious when Wx/Wy is small.