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Here, we would like to study the efficiency and utilization of radio frequency (RF) transmission in wireless sensor networks. A new dual source queueing model (with finite and infinite numbers of sensors) is introduced in order to obtain the most frequently studied system performance characteristics (e.g. mean response time, average number of jobs waiting for transmission, and the utilization of the...
In RF-powered computing systems, the battery-less devices can operate by harvesting energy from ambient RF signals. Although the energy is almost free, but the devices tend to black out frequently. Besides the devices' active period is short, if a task needs longer computation time than the active period, the task will fail. For example, the framed slotted ALOHA, which is a collision avoidance algorithm...
Mixed signal on chip solutions for space applications and high energy physics experiments require high voltage RF-LDMOS transistors with a sufficient ruggedness against ionizing radiation and single event burn out effects. We report on the effectiveness of a novel hardening by design approach for radiation tolerant integrated RF power MOSFET transistors confirmed by single event burn out (SEB) and...
The objective of this paper was to develop and evaluate clinimetric properties of a method for measuring Parkinson's disease (PD)-related temporal irregularities using digital spiral analysis. In total, 108 (98 patients in different stages of PD and 10 healthy elderly subjects) performed repeated spiral drawing tasks in their home environments using a touch screen device. A score was developed for...
Rapid developments and emergence of diverse wireless systems call for radio frontends with agile and multistandard properties. Within this publication the performance of a direct RF digitizing ΣΔ-modulator based analog-to-digital converter (ADC) is evaluated based on orthogonal frequency division multiplex (OFDM) system simulation on the bitstream layer. The necessary transmit and receive building...
As new devices are developed and manufactured, they may be tested to examine their immunity to and/or emissions of RF energy. The most common standard for this type of testing is IEC 61000-4-3 which takes place inside an anechoic chamber, at a limited number of device orientations and field polarizations. In cases where RF susceptibility is of interest, the standard calls for radiating the device...
We present the design and simulation of temperature compensated Radio-Frequency (RF) Free-Free (FF) beam MEMS resonators that are developed using PolyMUMPS, which is a commercial multi-user process available from MEMSCAP. The proposed devices, which operate at 10MHz and 20MHz, are designed using CoventorWare finite element modeling software. We present a novel and effective temperature compensation...
Voltage suppression devices are needed in electronic systems to prevent damage to electrical components from electrostatic discharge (ESD) events. Transmission line pulse testing of GaAs dual mode power amplifiers to determine ESD threshold damage voltages demonstrates the importance of polymer voltage-suppressor device trigger and clamping voltage for module ESD protection.
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