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Influence of Marrow on Ultrasonic Velocity and Attenuation in Bovine

by Trabecular Bone, J. M. Alves, J. T. Ryaby, J. J. Kaufman, F. P. Magee, R. S. Siffert , 1995
"... Abstract. Measurements of ultrasonic velocity and specific differential attenuation (SDA) were obtained on 24 bovine trabecular bone specimens from the femoral condyles. The measurements were obtained using two pairs of ultrasonic transducers, one with a low nominal center frequency (500 kHz) and th ..."
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Hz) and the other pair with a high nominal center fre-quency (1 MHz). The ultrasonic velocity and specific dif-ferential attenuation associated with the bone samples were determined both with and without marrow, i.e., replacing the marrow with water in the pores of the trabecular bone. Significant increases (2

FP 16.2: Silicon-on-Silicon Integration of a GSM Transceiver with VCO Resonator

by P. Davis, P. Smith, E. Campbell, J. Lin, K. Gross, G. Bath, Y. Low, M. Lau, Y. Degani, J. Gregus, R. Frye, K. Tai
"... Accurate and spurious-free design of an integrated VCO reso-nator in a GSM transceiver is demonstrated. The high-Q inductor (Q=60 at 1GHz) in the resonator is on a high-resistivity silicon substrate and the GSM chip is flip-chip mounted on the same substrate. The VCO meets all GSM requirements: phas ..."
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: phase noise is-142dBc/Hz at 10MHz from the 1018MHz center fre-quency. A single bipolar chip contains the RF transmit, receive, and synthesizer subsections for the GSM Standard. The addi-tion of an external low-noise amplifier, power amplifier, and filters complete the GSM radio section [1]. A number

Computational and experimental study of a microwave electromagnetic bandgap structure for potential use as a bandpass wireless interconnect

by J. J. Simpson, Student Member, A. Taflove, J. A. Mix, H. Heck - IEEE Microwave and Wireless Components Letters , 2004
"... Abstract—As clock rates continue to rise, problems with signal integrity, cross-coupling, and radiation may render impractical the baseband metallic interconnects presently used in computers. A potential means to address this problem is to use bandpass wireless interconnects operating at millimeter- ..."
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-wave center fre-quencies. We have conducted experimental and finite-difference time-domain (FDTD) computational studies scaled to a 10 GHz center frequency of single-row and double-row waveguiding defects within an electromagnetic bandgap structure. Our initial experimental results scaled to 10 GHz have

A broadband mm-wave and terahertz traveling-wave frequency multiplier on CMOS.” Solid-State Circuits

by Omeed Momeni, Student Member, Ehsan Afshari - IEEE Journal of
"... Abstract—Awideband frequency multiplier that effectively gen-erates and combines the even harmonics from multiple transistors is proposed. It takes advantage of standing-wave formation and loss cancellation in a distributed structure to generate high ampli-tude signals resulting in high harmonic pow ..."
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power. Wide bandwidth operation and odd harmonic cancellation around the center fre-quency are the inherent properties of this frequency multiplier. Using this methodology, we implemented a frequency doubler that operates from 220 GHz to 275 GHz in a standard 65 nm CMOS process. Output power of 6.6 d

10.7-MHz Fully Balanced, High-Q, Wide-Dynamic-Range Current-Tunable Gm-C Bandpass Filter

by Worawat Sa-ngiamvibool, Banlue Srisuchinwong
"... A 10.7-MHz fully balanced, high-Q, wide-dynamic-range current-tunable Gm-C bandpass filter is pre-sented. The technique is relatively simple based on two fully balanced components, i.e. an adder and a low-Q-based bandpass filter. The Q factor is approxi-mately equal to a typically high and constant ..."
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value of a common-emitter current gain (β) and is, for the first time, independent of variables such as a center fre-quency. Sensitivities of either the Q factor or the cen-ter frequency are constant between-1 to 1 and are no longer strongly affected by the Q factor or variables. As a simple example

Non-destructive quantification of snowpack properties

by Achim Heilig, Hans Peter Marshall, Olaf Eisen, Martin Schneebeli
"... A temporal observation of the stratigraphy of seasonal snowpacks is only possible with non-invasive methods. Elec-tromagnetic waves, specifically radar waves, proved to be the most appropriate technique to estimate internal snow parameters and media transitions non-destructively. Thereby, it is poss ..."
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continuous wave systems (FMCW) or a short impulse is radiated at a center fre-quency and bandwidth. The stratigraphic resolution and the penetration depth of both systems depends on the system parameters. The frequency determines the penetration depth and sensitivity and the bandwidth determines the vertical

Quasi-Elliptic Triple-Stopband Filter Based On Six Cross-Coupled SIW Resonators

by Mahbubeh Esmaeili, Jens Bornemann
"... Abstract—A new K-band triple-stopband filter in substrate integrated waveguide (SIW) technology is introduced. The filter consists of six rectangular cavities resonating in their fundamental mode. Main and cross couplings between resonators are used to design a filter with six transmission zeros, se ..."
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, respectively. The two passbands located between the three stopbands have center fre-quencies of 18.70 and 20.56 GHz with corresponding bandwidths of 0.97 GHz and 0.88 GHz, respectively. The filter is prototyped and measured. Good agreement between simulated and measured results proves the reliability

An All-Digital 12 pJ/Pulse IR-UWB Transmitter Synthesized From a Standard Cell Library

by Youngmin Park, David D. Wentzloff
"... Abstract—This paper presents an all-digital impulse radio ultra-wideband (IR-UWB) transmitter. All functional blocks in the transmitter are implemented with digital standard cells and automatically place-and-routed by design tools. The center fre-quency and the bandwidth of the UWB pulses are digita ..."
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Abstract—This paper presents an all-digital impulse radio ultra-wideband (IR-UWB) transmitter. All functional blocks in the transmitter are implemented with digital standard cells and automatically place-and-routed by design tools. The center fre-quency and the bandwidth of the UWB pulses

Strain Imaging of Arterial Wall with Reduction of Effects of Variation in Center Frequency of Ultrasonic RF Echo

by Hideyuki Hasegawa, Hiroshi Kanai
"... Abstract — Atherosclerotic change of the arterial wall leads to a significant change in its elasticity. For assessment of elas-ticity, measurement of arterial wall deformation is required. For motion estimation, correlation techniques are widely used, and we developed a phase-sensitive correlation m ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
, the displace-ment estimated by such phase-sensitive methods are biased when the center frequency of the RF echo apparently varies. One of the reasons for the apparent change in the center fre-quency would be the interference of echoes from scatterers within the wall. In the present study, a method

This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination. IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS 1 A Bio-Realistic Analog CMOS Cochlea Filter With

by High Tunability, Ultra-steep Roll-off, Shiwei Wang, Student Member, Thomas Jacob Koickal, Alister Hamilton, Rebecca Cheung, Senior Member, Leslie S. Smith, Senior Member
"... Abstract—This paper presents the design and experimental results of a cochlea filter in analog very large scale integration (VLSI) which highly resembles physiologically measured response of the mammalian cochlea. The filter consists of three specialized sub-filter stages which respectively provide ..."
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, the filter can be configured to operate with center fre-quencies from 31 Hz to 8 kHz. The filter is order, consumes power and occupies chip area. A parallel bank of the proposed filter can be used as the front-end in hearing prosthesis devices, speech processors as well as other bio-inspired auditory systems
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