IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications

A novel organization of switched capacitor charge pump circuits based on voltage doubler structures is presented in this paper. Each voltage doubler takes a dc input and outputs a doubled dc voltage. By cascading n voltage doublers the output voltage increases up to 2n times. A two-phase voltage doubler and a multiphase voltage doubler (MPVD) structures are discussed and design conside... View full abstract»

We suggest a new mechanism for interarea electric power system oscillations in which two oscillatory modes interact near a strong resonance to cause one of the modes to subsequently become unstable. The possibility of this mechanism for oscillations is shown by theory and computational examples. Theory suggests that passing near strong resonance can be expected in general power system models. The ... View full abstract»

The computation of an optimal operation point in power systems is a nonlinear optimization problem in functional space, which is not easy to deal with precisely, even for small-scale power systems. On the other hand, the emergence of competitive power markets makes optimal power flow (OPF) with transient stability constraints increasingly important because the conventionally heuristic evaluation f... View full abstract»

This paper and its companion (see ibid., vol. 48, p. 281-88, 2001) are devoted to to the analysis of the application of a chaotic piecewise-linear one-dimensional (PL1D) map as Random Number Generator (RNG). In Part I, me have mathematically analyzed the information generation process of a class of PL1D maps. In this paper, we find optimum parameters that give an RNG with lowest redundancy and max... View full abstract»

This paper and its companion (Part II) are devoted to the analysis of the application of a chaotic piecewise-linear one-dimensional (PL1D) map as random number generator (RNG). Piecewise linearity of the map enables us to mathematically find parameter values for which a generating partition is Markov and the RNG behaves as a Markov information source, and then to mathematically analyze the informa... View full abstract»

This paper treats a nonlinear dynamical system with both continuous-time and discrete-time variables as a differential-difference-algebraic equation (DDA) or a hybrid dynamical system, presents a fundamental analyzing method of such a DDA system for local sampling, asymptotical stability, singular perturbations and bifurcations, and further shows that there exist four types of generic codimension-... View full abstract»

An earlier paper mentioned six operational floating amplifier (OFA) based equivalent forms of Wien-bridge oscillators (WBOs). Here, it is shown that there are, in fact, 16 such forms of WBOs. An elegant explanation of the OFA based forms is provided, thus paving the way for realizing a number of new 1-OFA oscillator configurations, i.e., from the knowledge of the conventional 1-op-amp oscillators.... View full abstract»

Research literature on the topic of synchronizing hyperchaotic systems predominantly addresses theoretical issues-most investigations lack experimental results. This paper aims to bridge this gap by presenting an electronic circuit implementation of a particular hyperchaotic synchronization strategy. Specifically, previous research has demonstrated that linear observers may be synchronized to a ce... View full abstract»

A new approach for designing a cellular nonlinear network (CNN) cell is introduced. The method can be used when the processed images are bipolar, i.e., black and white. A simple circuit realization is introduced that can be applied when building up the analog part of the cell. The cell output nonlinearity is an easily realizable positive range high gain sigmoid. Moreover, a state limited model is ... View full abstract»

In this paper, a new phenomenon observed in cellular neural networks (CNNs) is treated. Some experimental results will be introduced, showing that spatio-temporal noise in two layers-two dimensional CNN architectures could improve the propagation of damped traveling waves. The CNN model and templates are reported and computer simulation results will emphasize the innovative results View full abstract»

Two generic classes of chaotic oscillators comprising four different configurations are constructed. The proposed structures are based on the simplest possible abstract models of generic second-order RC sinusoidal oscillators that satisfy the basic condition for oscillation and the frequency of oscillation formulas. By linking these sinusoidal oscillator engines to simple passive first-order or se... View full abstract»

In this paper, the Floquet theory is combined with harmonic balance for the in-depth analysis of a Chua's family circuit, exhibiting intermittence. Floquet multipliers are calculated along the periodic solution paths obtained through harmonic balance by means of a continuation algorithm. The analysis of both the stable and unstable solution sections enhances the information about the system and pe... View full abstract»

For the representation of a bandlimited signal by its discrete samples for several purposes an estimate of the boundation of the signal from its values at the sampling instants and its energy is desirable. For sampling with the Nyquist rate no such estimate exists in general. This paper proposes an estimation for oversampled signals View full abstract»

A time-interleaved A-D converter (ADC) system is an effective way to implement a high-sampling-rate ADC with relatively slow circuits. In the system, several channel ADCs operate at interleaved sampling times as if they were effectively a single ADC operating at a much higher sampling rate. However, mismatches such as offset, gain mismatches among channel ADCs as well as timing skew of the clocks ... View full abstract»