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Now showing items 11-20 of 143
Design considerations for MMIC distributed amplifiers
(IEEE, 1994)
The bandwidth of the input artificial line in a distributed amplifier is the main band limiting factor. By choosing this impedance properly the bandwidth of a distributed amplifier can be maximized. A four section GaAs ...
Designing efficient CMUT cells for airborne applications
(IEEE, 2014)
In this work, we study airborne CMUT cells with vacuum gap where silicon plate is operated both in elastically linear and nonlinear regimes. We report the results of a new mode of operation where the plate center swings ...
Resonant harmonic response in tapping-mode atomic force microscopy
(American Physical Society, 2004)
Higher harmonics in tapping-mode atomic force microscopy offers the potential for imaging and sensing material properties at the nanoscale. The signal level at a given harmonic of the fundamental mode can be enhanced if ...
Using phase relations in microstrip directional couplers to achieve high directivity
(2013)
We analyze the microstrip directional couplers with a special focus on the phase difference between the coupled and isolated ports. The analysis uses the even-odd mode decomposition technique and network theory. The results ...
Hybrid atomic force/scanning tunneling lithography
(American Vacuum Society, 1997)
We present a new technique for performing lithography with scanning probes that has several advantages over standard methods. This hybrid lithography system combines the key features of the atomic force microscope (AFM) ...
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 ...
A new detection method for capacitive micromachined ultrasonic transducers
(IEEE, 1998)
Capacitive micromachined ultrasonic transducers (cMUT) have become an alternative to piezoelectric transducers in the past few years. They usually consist of many small membranes all in parallel. In this work we report a ...
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 ...
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 ...
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 ...