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Current-mode digital circuits operating with constant, continuous power supply current are presented. Layout of introduced gate and static, classical voltage inverter layout are shown for comparison. SPICE simulations based on extracted parameters of these gates are presented. The elementary operations that form current mode gate basis and elementary logical operations in this basis have been described...
The paper deals with the numerical modelling of the unsteady temperature fields in the elements of technological systems using data subject to errors. The multistagemultigroup approach to numerical modelling of transient temperature fields is suggested. The internal structure of the matrix of coefficients of the set of constraint equations has been analyzed and simplifications in the adjustment procedure...
The main features of the Class-D Zero-Voltage-Switching (ZVS) tuned power amplifier are its high efficiency and high power-output capability. In the paper the operation principle of the Class-D ZVS amplifier are discussed. The simplified analysis assuming the sinusoidal current in the output series-resonant circuit is presented and the equations describing the amplifier operation in the optimum and...
We investigate in this paper long-term (steady-state) behaviour observed in arrays of discretely-coupled third-order chaotic cells. Using computer experiments we confirmed existence of an abundance of stable final states depending only on the initial conditions applied in the individual cells. After long seemingly chaotic transients solutions of individual cells settle in a periodic mode and the array...
The simple algebraic transformations using the approximation of transfer function by K( s) =[sigma]p kp exp( -stp) or the approximation of convolution by: [formula] enable the creation of models of dynamics in the form of first-order (linear) differential equations with deviated arguments. The suitable calculation methods with regard to possible additional postulates connected with the design of simplified...
This paper presents an approach to [sigma delta] modulators relying on current mode sampled data circuits with switched transconductances. The [sigma delta] modulator structures are composed of current mode building blocks with transconductance amplifiers and capacitors. All building blocks and three different [sigma delta] structures: first-order, second-order and third-order two-stage are designed...
Positive singular discrete linear time-invariant systems are considered. Some properties of the fundamental matrix and solutions of the positive singular discrete linear systems are characterised. Two new methods for computation of the fundamental matrices are proposed. Necessary and sufficient conditions are established for the reachability of the positive singular systems. Sufficient conditions...
The paper shows that orthogonal structures with rotators can be used for implementation of an all-pass transformation to obtain a transfer function of 3-D digital filter based on I-D digital prototype. Example of implementation of a 3-D filter as a low-pass spherically symmetric orthogonal filter is presented.
The paper introduces a unified method for fault diagnosis in analog dynamic systems of different physical nature (e.g. electronic, mechanical, power, hydraulic). The method also handles mixed systems composed of multi-phenomena blocks. Applicability of the diagnosis algorithm, originally designed for analog electronic circuits, is extended. As a test example the fourth order servomechanism is discussed...
The head question is answered in a single-valued manner on a basis provided by this authors thinking scheme: it turns out that only four massive leptons accompanied by four massless neutrinos are allowed. Among the allowed set of leptons heavy electron has been found, appending known three: electron, muon and tauon, so far, not admitted by physicists community.
Fractal image compression is a promising brand new compression method. In the paper several algorithms are compared. A majority of those algorithms accelerate the encoding process by reduction of the size of the domain pool. I show in the paper that unlike assumed in many algorithms, the optimal domain block need not be located in the close neighborhood of the range block. I suggest two techniques...
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