Applications of surface acoustic and shallow bulk acoustic wave devices

Article Abstract:

Surface acoustic wave (SAW) devices were used initially as intermediate frequency (IF) filters for domestic television receivers, but the ruggedness, light weight and small size of the devices made them suitable for a range of products and applications. SAW filters are now used for low signal-level or receiver front-end filtering, as well as in signal processing and gallium arsenide semiconductors. Shallow bulk acoustic wave (SBAW) devices outperform SAW devices in some applications, particularly in stable oscillators requiring higher power levels and/or reduced sensitivity to surface contamination and defects. The performance and device parameters of SAW and SBAW devices are examined, and various applications for the devices are described.

Integrated circuit fabrication, Technology, Piezoelectric devices, Gallium Arsenide Semiconductor, Semiconductor Preparation, Filters, Filtering, technical, Substrates

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A New Method of Synthesizing Acoustic Holograms

Article Abstract:

Acoustical holograms are synthesized using a method that reduces transducer arrays with a method that is applicable to cases whether transmitters and receivers are arranged on two opposite planes or the same plane. The number of data obtained without redundancy is the product of transmitters and receivers. Diagrams illustrate the hologram contruction.

Holography, Acoustics, Acoustic Devices, Transmitter, Receiver

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Frequency estimation error in Pisarenko harmonic decomposition method

Article Abstract:

A Pisarenko harmonic decomposition (PHD) method is presented with consistent results for its frequency estimation error in relation to record length, signal-to-noise ratio, and difference of underlying frequencies. Extensive mathematical computations are included.

Mathematical models, Tests, Waveforms, Testing, letter to the editor

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