Search
Now showing items 1-10 of 146
Analytic modeling of loss and cross-coupling in capacitive micromachined ultrasonic transducers
(IEEE, Piscataway, NJ, United States, 1998)
The structural loss mechanism of capacitive micromachined ultrasonic transducer (cMUT) is investigated using finite element analysis and the normal mode theory. A single micromachined transducer membrane on an infinite ...
Two-dimensional micromechanical bimorph arrays for detection of thermal radiation
(American Institute of Physics, 1997-06-16)
We demonstrate that two-dimensional arrays of micromechanical bimorphs can be used as thermal sensors to image infrared (IR) radiation. A density of 100 pixels per mm2 is achieved by coiling a bimorph beam into the shape ...
VLSI circuits for adaptive digital beamforming in ultrasound imaging
(IEEE, 1993)
For phased-array ultrasound imaging, alternative beamforming techniques and their VLSI circuits are studied to form a fully digital receive front-end hardware. In order to increase the timing accuracy in beamforming, a ...
Pole-zero computation in microwave circuits using multipoint Padé approximation
(Institute of Electrical and Electronics Engineers, 1995-01)
A new method is proposed for dominant pole- zero (or pole-residue) analysis of large linear microwave circuits containing both lumped and distributed elements. The method is based on a multipoint Padé approximation. It ...
A Lamb Wave Lens for Acoustic Microscopy
(1992)
In a conventional scanning acoustic microscope the excited leaky modes contributes significantly to the high contrast obtained in the images. However, all such modes exist simultaneously, and the interpretation of the ...
A phase aberration correction method for ultrasound imaging
(IEEE, 1993)
A computationally efficient method for phase aberration correction in ultrasound imaging is presented. The method is based on time delay estimation via minimization of the sum of absolute differences between radio frequency ...
A novel algorithm for DC analysis of piecewise-linear circuits: popcorn
(IEEE, 1994)
A fast and convergent iteration method for piecewise-linear analysis of nonlinear resistive circuits is presented. Most of the existing algorithms are applicable only to a limited class of circuits. In general, they are ...
Response of acoustic imaging systems using convergent leaky waves to cylindrical flaws
(IEEE, 1989)
Characterization of near-surface properties of materials by acoustic means is most convenienth done by surface-acoustic-waves (SAW) that are spatially confined to the surface. There are several techniques available to ...
Design and implementation of a general-purpose median filter unit in CMOS VLSI
(IEEE Solid-State Circuits Society, 1990)
A general-purpose median filter unit configuration is proposed in the form of two single-chip median filters, one extensible and one real-time. The networks of the chips are pipelined and systolic at bit level and based ...
An optimized isolation network for the wilkinson divider
(Institute of Electrical and Electronics Engineers, 2014-12)
We propose an isolation network to simultaneously improve the input return loss, output return loss and isolation of the Wilkinson power divider in a wide bandwidth. The required even mode and odd mode reflection coefficients ...