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Split-ring resonators (SRRs) are fundamental elements of metamaterials, which exhibit attractive properties and find various electromagnetic applications. In this paper, we consider the inclusion of SRRs for improving the performance of various antennas, with respect to their radiation patterns, electrical size or wideband response. The provided results verify that incorporating SRRs in the radiator...
In this work, a novel architecture that simultaneously accesses multiple and non-overlapped sub-regions of a static random access memory, is presented. The selection of the multi memory fields is succeeded via intra-encoders, placed one for every memory field. The addressing of the memory is done using a modified approach of the crossbar addressing scheme. At the presented implementation, each memory...
In this work, the implementation of a chaotic oscillator by using a microcontroller is proposed. The dynamical system, which is used, belongs to the recently new proposed category of dynamical systems with hidden attractors. In more details, the system has an infinite number of equilibrium points which is located on an open hyperbolic sine curve. By programming the microcontroller, the three most...
Associative memories are massively parallel circuits which perform a parallel comparison between stored data and input data. When operated in parallel comparison mode, they require high current spikes (in the order of few amperes) at every clock edge, and the voltage drop due to current spikes can seriously affect the circuit operation. This paper proposes a method to enhance the power integrity,...
Deterministic schemes are usually unable to predict random media uncertainties and as a result produce unreliable outcomes in this kind of problems. In this work, we present a novel finite difference time domain (FDTD) technique that manages to calculate the statistics of the involved field quantities, considering that the variability of random media is known. The proposed method is applied in polar...
As wireless power transfer (WPT) systems emerge, the efficiency and achievable transmitting distance are two constraining factors for their prevalence over wired ones. In this paper, two split ring resonator (SRR)-based WPT configurations, with circular and square SRRs, as their transmitting and receiving elements, are investigated for various frequencies and distances. The efficiency is found to...
A method of hardware reduction is proposed for logic circuits of Moore FSMs implemented with CPLDs. The method is based on the idea of code sharing. The main difference from already known methods is that the counter increases its content during conditional and unconditional transitions. An example of application of proposed method is given.
The current work contributes a detailed design of overlapping element direct radiating arrays for satellite communications employing the elements on a planar host. Direct radiating arrays are undisputedly considered as the next step in the space sector of communication industry but their advent is not without challenge. Direct radiating arrays can provide the highly adaptive performance needed for...
A 1.8V CMOS chopper four-quadrant analog multiplier, intending to serve as an autonomous IC block for low-frequency signal processing, is presented. Particular emphasis is laid upon achieving low output noise by means of chopper stabilization, while the multiplier's operation is based on the MOS Translinear Principle. The proposed design has been implemented and simulated in TSMC 0.18 µm CMOS process.
In the recent decades, applications of chaotic systems have flourished in various fields. Hence, there is an increasing demand on generalized, modified and novel chaotic systems. In this paper, we combine the general equation of jerk-based chaotic systems with simple scaled discrete chaotic maps. Numerical simulations of the properties of two systems, each with four control parameters, are presented...
A new 4-D memristive system is presented in this paper. The peculiarity of the model is that it displays a line of equilibrium points and it has hyperjerk dynamics in a particular range of the parameters space. The behavior of the proposed system is investigated through numerical simulations, by using phase portraits, Lyapunov exponents and bifurcation diagrams. Also, its circuital implementation...
A methodology is presented for compact modeling synthesis of integrated transformers. The synthesis procedure is based on a specific constrained optimization procedure to evaluate the elements of the compact model. The proposed methodology is independent of technology parameters or the geometrical characteristics of the inductor.
This paper presents the design of a software demonstrator to be used in conjunction an embedded system for real-time pattern matching. The demonstrator was designed to verify the proper hardware operation and to calculate the various constants used, thus the operations on the underlying model are bit-accurate. The embedded hardware is based on systems that have been developed for use in the field...
In this paper, efficient designs of the Fast Fourier Transform (FFT) Decimation-in-Time (DIT), radix-2, Butterfly Unit are proposed. Several techniques are incorporated in order to achieve higher performance. The operations are fused by keeping the intermediate variables in Carry-Save format. Besides of the conventional, the Gauss complex multiplication algorithm is also explored. Considered that...
In future cellular networks, the ability to predict network parameters such as cell load will be a key enabler of several proposed adaptation and resource allocation techniques. In this study, we consider a joint exploitation of spatio-temporal data to improve the prediction accuracy of standard regression methods. We test several such methods from the literature on a publicly available dataset and...
The analysis, design and circuit synthesis of a fractional order piecewise linear (PWL) system is presented in this paper. By selecting incommensurate fractional orders for the dynamical system, multi-scroll chaotic attractors are observed. The resulting fractional order PWL chaotic system satisfies the stability theorem of fractional calculus. Lyapunov exponents confirm the chaotic behavior. Moreover,...
Amplitude detection is based on observations of the information carrying molecules made at the receiver and can be enhanced by optimizing the timing and the number of them. In this paper, a diffusion-based molecular communications system with a passive receiver is analysed under two different amplitude based detection techniques. In particular, low complexity detectors utilizing a single or multiple...
This paper proposes a hardware platform implementation on FPGA for two fractional-order derivative operators. The Grünwald-Letnikov and Caputo definitions are realized for different fractional orders. The realization is based on non-uniform segmentation algorithm with a variable lookup table. A generic implementation for Grünwald-Letnikov is proposed and a 32 bit Fixed Point Booth multiplier radix-4...
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