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Synchronous-in-phase electric drives are widely used in thermal-imaging and laser scanning systems due to high accuracy characteristics in a wide range of angular velocity control. The purpose of the article is to investigate the method of controlling an electric drive with phase synchronization under the reference signal jumps. The results of computer simulation modelling of the synchronous-in-phase...
Daily climate data observations from more than 3000 climate measurement sites in the continental U.S. were mined and analyzed to derive insights and trends from climate extreme indices. Daily climate data observations were aggregated by climate divisions and analyzed to derive a new climate extremes indices data set (Threshold Exceedence Frequency, TEF). Each climate division was statistically assessed...
This paper investigates the solid state transformer applied for the HVDC transmission from the offshore windfarm. The 5kVA experimental setup is developed and comparison of 50Hz, 400Hz and 1000Hz operation. Dependency of the loss in the transformer with different core materials to frequency is investigated. Frequency loss dependency of several core materials are compared with experimental measurement...
Radio frequency photonics is demonstrating superior performance in communication systems using discrete components. As systems establish an upgrade path balancing challenging bandwidth requirements with size, weight and power constraints, the time is ripe to transition to a more efficient and cost-effective hybrid manufacturing technology.
This paper presents an 18-to-23 GHz sub-harmonically injection-locked all-digital PLL (SIL-ADPLL). It adopts the proposed injection-locked frequency divider aided adaptive injection timing alignment technique and uses a proposed (UP-DN) block to adjust the injection timing adaptively at output frequency higher than 20 GHz with low power consumption. A new pulse generator is proposed to relax the trade-off...
The paper presents a continuous comparison comparator as an IP block. The comparator is developed in a standard semiconductor manufacturing process of 180 nm and can be applied in the design of system-on-a-chip devices, a dual-slope ADC in particular. This ADC can be used in the design of multimeters, digital thermometers, and other devices. The comparator is modeled in Cadence software. The result...
Proteins from the same family have similar functions. Hence, it is important to discover from a protein family conserved sequence patterns with variations to unveil the functionality of a functional domain. Aligned Pattern Clusters (APCs) are knowledge-rich representations comparing with probabilistic models. If significant aligned residue associations (ARAs) were discovered in APCs, they could reveal...
Satellite communications are providing higher data rates through the use of higher frequency bands and higher order modulation schemes [1]. There may be a need to distribute antennas over hundreds of meters to kilometers, for example in a goniometric system for direction finding applications [2]. Radio frequency (RF) photonics may be used as a distributed gateway to access these high frequency bands...
Most physical activity (PA) assessment studies use wearable accelerometers attached to the hip. However, there is significant and recent interest in understanding the usefulness of wrist based accelerometer data collection due to ease of use and higher compliance. This paper develops machine learning methods for identifying activity types and computing energy expenditures. Our approach converts the...
This paper describes a novel fully integrated 35GHz frequency modulated continuous wave (FMCW) PLL with twins-VCO to 7GHz sweeping bandwidth. The proposed FMCW PLL is composed of twins-VCOs, SDM modulator and waveform generator. A novel frequency sweeping extension (FSE) technique is proposed to make the twin-VCOs take turns to sweeping to realize wide sweeping bandwidth without sacrificing the sweeping...
Traditionally, the using an analog-to-digital conversion demands agreeing with the requirements of Shannon, Nyquist and Kotel'nikov theorem. According to this theorem, the frequency of the conversion should, at least, twice exceed the upper boundary frequency of the spectrum of the converted signal. It is also traditionally considered that the presence of high-frequency noises of more than one quantization...
The design and implementation of a K-band fast hopping frequency synthesizer based on DDS and PLL is described. Main technical specifications are as follows: frequency ranges from 24GHz to 27GHz, step frequency is 50MHz and lock time is less than 150ns. The parameters of loop filter and the analyses of phase noise and lock time are provided by MATLAB simulation to verify the feasibility of the design...
This letter presents a lower power and wide locking range divide-by-2 with capacitive cross-coupled injection-locked frequency divider (ILFD) implemented in the TSMC standard 0.18 μm CMOS process. The ILFD is based on a capacitive cross-coupled VCO with one injection MOSFET for coupling the external signal to the resonator. The ILFD uses one 3-dimensional inductors to reduce the die area. At the supply...
Synchronic-in-phase electric drive is widely used in thermal-imaging and laser scanning systems due to high accuracy characteristics in the wide range of angular speed regulation. The point of the article is to examine the application features of impulsive phase-frequency discriminator with extended functional abilities by implementation of different methods of electric drive control with phase synchronization...
In this article, a bandwidth-enhanced metasurface has been designed using single circular split ring as unit cell on the top surface of a metal backed FR4 substrate. The structure behaves as cross polarization conversion (CPC) metasurface over full width at half maxima (FWHM) bandwidth of 12.94 GHz ranging from 9.44 GHz to 22.38 GHz. The proposed CPC metasurface maintains bandwidth enhancement upto...
This paper introduces four types of 28GHz phase-locked oscillators architecture for future next generation fifth generation wireless system. The simple phase noise formulations of four different phase-locked oscillators were also modeled to accurately estimate each phase noise for performance comparison. The simulated phase noises based on the derived system model provides fast performance calculation...
This paper proposes a frequency observer based control of a solar energy conversion system (SECS). The proposed control eliminates the DC offset and harmonics current and provides fundamental component of load current. The mathematical analysis of the control is corroborated and discussed in terms of filtering capabilities. Besides, capability of maximum power extraction, it integrates maximum extracted...
We describe a method for estimating finger motion on the basis of the frequency conversion of electromyogram (EMG) signals and the image recognition by using a convolutional neural network (CNN). Since EMG signals are generated before finger motion, various EMG-based systems have been developed for smoothly controlling a robot hand. We used a simple CNN model for estimating finger motion by classifying...
Time Difference Of Arrival (TDOA) method is very often used inside electronic intelligence systems. TDOA method requires the high signal to noise ratio at the output of the intermediate frequency amplifier for target localization, usually around 12 dB or more. At low signal-to-noise ratio TDOA is inaccurate and especially in case of the active jamming it is nearly impossible. The multilateral TDOA...
A boost dc-dc dimmable AC-LED driver is presented in this paper based on Zero Current Switching Quasi-Resonant Converters (ZCS-QRCs). The proposed driver is based on replacing the diode in conventional converter topologies (i.e. buck, boost or buck-boost) by a string of High-Brightness Light-Emitting Diodes (HB-LED). Hence, the HB-LED string will be working as the rectifier of the converter switching...
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