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One of the urgent problems of a modern power system are low frequency oscillations (hereinafter LFO) as they reduce the static and dynamic stability. Today the important task is to identify the LFO sources and means of such vibrations effective damping. The basic characteristics of the oscillation frequency and the voltage amplitude at station buses were obtained using devices phazor measurement units...
This paper presents hardware topologies utilizing MEMS accelerometer in FM modulation scheme to allow for active correction of vibration impairments on timing and phase noise parameters. The exact derivation of the corrective vector using FM modulation scheme is shown with associated relationship to g-sensitivity vector. Measurement techniques for g-sensitivity, manufacturing variability of the corrective...
determining the epileptogenic zone (EZ) from intracranial electroencephalography (iEEG) recordings is an important but nontrivial task. In this pilot study we demonstrate the usefulness of phasesynchronized phase-amplitude coupling constellations as a hybrid construct from well-established phase-amplitude and phase-phase coupling measurements. Also, we introduce a heuristic measure related to spectral...
A method for achieving frequency synchronization between two distantly positioned high frequency oscillators is presented. The method is based on using GPS disciplined 10 MHz reference sine waves and phase locked dielectric resonator oscillators. In order to be able to measure the frequency difference between high frequency sources precisely, frequency down-conversion by a mixer is implemented. The...
A low-power sensor interface IC suitable for a differential frequency measurement application is demonstrated. The circuit is used in a FBAR sensor system which includes a sensor and a reference FBAR. The sensor signal is processed and a digital output representing the sensor input is transmitted using a two wire serial interface. The architecture is entirely digital and benefits from scaling to advanced...
A novel oscillation system, which consists of a U-shaped cantilever and a beam-shaped cantilever, was designed, fabricated and characterized for synchronized oscillation-based applications. Two geometrically different cantilevers, with resonant frequencies of 372.503 kHz (detecting) and 182.506 kHz (sensing), are coupled by two coupling overhangs. Under synchronized oscillation, the frequency response...
This work describes a demonstration platform for frequency-modulated continuous wave (FMCW) based ranging systems operating in the 5.8 GHz ISM band. The goal is to gain insight into system behavior and determine critical system parts prior to integration on chip. The versatility and configurability of the presented system allows testing different synchronization and ranging principles. A synchronization...
The study of the flow around a small group of circular cylinders has attracted considerable interest in recent years due to the importance of this type of flow for a better understanding of both bluff-body fluid dynamics and fluid structure interaction. The problem of two staggered stationary cylinders has been addressed by a number of authors. Significant changes in the fluid dynamics occur when...
Testing of Phasor Measurement Units (PMU devices) is necessary for any PMU application, be it a simple visualization and archiving system or a more complex set of real-time system operations tools. PMUs are available from virtually every manufacturer of protection and monitoring equipment. They are often implemented as embedded functions within relays or disturbance recorders. This paper describes...
The chip design based on EDA technology is becoming the mainstream of the electronic system design. The objective of this project is to achieve a better method of the measurement and the multiplication of the measured frequency using the EPM3128. Both the VHDL programms and the timing emulations are achieved detailedly. In order to realized the measurement and the multiplication of the mearsured frequency,...
Numerous commercial and military applications utilize precision quartz oscillators and/or atomic frequency standards to generate super-accurate frequencies and time signals crucial to system performance. Examples where precise time and frequency is essential are telecommunications, drilling for natural resources, synchronizing railroads, satellite ground stations, laboratory standards and various...
All synchronous systems use a clock distribution network covering a large section of the integrated circuit and handling the fastest frequencies of the device. In this work, the performance of interconnected and coupled ring oscillator arrays working as clock distribution networks is analyzed. The use of interconnected three-delay stages rings are proposed even for chip lengths from 4 to 24 mm. Typical...
In this paper the Duffing oscillator is applied to solve high transmitter power consumption and high probability of intercept of underwater mine. A chaotic oscillator has the property of being sensitive to weak signal and being immune to noise, which leads to a potential application in weak signal detection. The weak signals can be used as the outside periodic exciter and be brought in the Duffing...
Time keeping and synchronization are important services for networked and embedded systems. High quality timing information allows embedded network nodes to provide accurate time-stamping, fast localization, efficient duty cycling schedules, and other basic but essential functions - all of which are required for low power operation. In this paper we present a new type of local clock source called...
In this study, we investigate the frequency of appearance of the phase patterns and clarify the effect of parameter deviations. From the simulation results, it is shown that some phase pattern can be seen easily and the others can hardly seen because of the deviations. Such phenomena can separate the preferred patterns from undesirable patterns and it is convenient for the use of the system as some...
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