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Search Results: 1 - 10 of 191170 matches for " D. Biolek "
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Time Domain Analysis of Linear Systems Using Laplace Inversion
D. Biolek
Radioengineering , 1994,
Abstract: An efficient method of time domain analysis of linear systems is proposed. This method is based on the state space approach and on the numerical Laplace inversion. The problems of the sampled-data input signal and steady-state response computation are discussed.
Multi-Step Numerical Laplace Inversion
D. Biolek
Radioengineering , 1992,
Abstract: An accurate numerical Laplace inversion algorithm is presented. In comparison with original multi-step inversion method, some improvements are made. The concrete Turbo Pascal routines are introduced.
Analytical Computation of the Area of Pinched Hysteresis Loops of Ideal Mem-Elements
Z. Biolek,D. Biolek,V. Biolkova
Radioengineering , 2013,
Abstract: The memory elements, memristor being the best known of them, driven by a periodical waveform exhibit the well-known pinched hysteresis loops. The hysteresis is caused by a memory effect which results in a nonzero area closed within the loop. This paper presents an analytical formula for the loop area. This formula is then applied to memory elements whose parameter-vs.-state maps are modeled in the polynomial form. The TiO2 memristor, a special subset of the above elements, is analyzed as a demonstration example.
Behavioral Modeling of Memcapacitor
D. Biolek,Z. Biolek,V. Biolkova
Radioengineering , 2011,
Abstract: Two behavioral models of memcapacitor are developed and implemented in SPICE-compatible simulators. Both models are related to the charge-controlled memcapacitor, the capacitance of which is controlled by the amount of electric charge conveyed through it. The first model starts from the state description of memcapacitor whereas the second one uses the memcapacitor constitutive relation as the only input data. Results of transient analyses clearly show the basic fingerprints of the memcapacitor.
SPICE Model of Memristor with Nonlinear Dopant Drift
Z. Biolek,D. Biolek,V. Biolkova
Radioengineering , 2009,
Abstract: A mathematical model of the prototype of memristor, manufactured in 2008 in Hewlett-Packard Labs, is described in the paper. It is shown that the hitherto published approaches to the modeling of boundary conditions need not conform with the requirements for the behavior of a practical circuit element. The described SPICE model of the memristor is thus constructed as an open model, enabling additional modifications of non-linear boundary conditions. Its functionality is illustrated on computer simulations.
Spectral Representation of Discrete-Time Signals and Its Educational Aspects
V. Biolkova,D. Biolek
Radioengineering , 1995,
Abstract: Some opinions how to understand and teach spectral representation of discrete-time (DT) signals are discussed in this contribution. There are two excessive ways often used in the educational process. The first one presents discrete - time signal as a product of sampling of continuous - time (CT) signal. The spectral properties of DT signal are then derived from the properties of CT signal and from the peculiarity of the sampling process. Second way builds the spectral description only in the area of DT signals irrespective of the CT signal spectral theory. In our paper, another approach will be presented which prefers the second way but emphasizes the connection and common properties of DT and CT signals. This method enables understanding of new subject - matter because teacher can utilize student's knowledge from the area of CT signals.
Four-Phase Oscillators Employing Two Active Elements
V. Biolkova,J. Bajer,D. Biolek
Radioengineering , 2011,
Abstract: Two novel four-phase voltage-output oscillators are proposed. These circuits can also be utilized as quadrature oscillators with floating outputs. Each oscillator employs two DO-CIBA (Differential Output- Current Inverter Buffered Amplifier), two grounded capacitors, and four or three resistors. Independent control of the oscillation frequency (OF) and oscillation condition is practicable in both oscillators. Real measurements on the oscillator specimens confirm the ability of easy OF control and extra low THD, which is less than 0.07%.
Immediate Analysis of Periodic Steady States in Switched DC-DC Converters via SPICE
D. Biolek,V. Biolkova,Z. Kolka
Radioengineering , 2012,
Abstract: The method of immediate analysis of periodic steady states in switched DC-DC converters operating in the continuous current mode is described. The initial conditions, which correspond to the periodic steady state, are found in the first step. They are used consequently for the conventional transient analysis. A special SPICE model of the converter finds automatically these initial conditions, which are then available within the transient analysis. The method works both for the well-known behavioral models of switched converters and also for models which employ complex nonlinear SPICE models of semiconductor switches.
A Novel Current-Mode Full-Wave Rectifier Based on One CDTA and Two Diodes
F. Khateb,J. Vavra,D. Biolek
Radioengineering , 2010,
Abstract: Precision rectifiers are important building blocks for analog signal processing. The traditional approach based on diodes and operational amplifiers (OpAmps) exhibits undesirable effects caused by limited OpAmp slew rate and diode commutations. In the paper, a full-wave rectifier based on one CDTA and two Schottky diodes is presented. The PSpice simulation results are included.
Current-Mode CCII+ Based Oscillator Circuits using a Conventional and a Modified Wien-Bridge with All Capacitors Grounded
J. Bajer,A. Lahiri,D. Biolek
Radioengineering , 2011,
Abstract: The paper deals with a pair of current-mode sine-wave oscillator circuits. Both these circuits are implemented using positive second-generation current conveyors (CCII+). The principle of the first oscillator is based on a conventional Wien-bridge network. However, this implementation suffers from the use of a floating capacitor, which can be unacceptable in the case of on-chip integration. This drawback is solved in the second variant via a slight modification of the Wien-bridge network, which then allows the use of all capacitors grounded. The modified circuit version was manufactured by means of the socalled diamond transistors, which play the role of CCII+ active building blocks. The circuit behavior was analyzed theoretically, with particular emphasis on the identification of real effects and their elimination, and subsequently verified experimentally. The experimental results are included in the paper.
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