An approach to design of chaotic oscillators with controlled bandwidth in different frequency bands is proposed. One of possible mathematical models of the oscillator and simulation results are considered. Implementations of microwave chaotic oscillators and experimental results are demonstrated. Index terms – Dynamic chaos, chaotic oscillator, frequency-selective circuit, microstrip line, wide...

A frame work for Adaptive Filter/Adaptive Noise Canceller (AF/ANC) design through Evolutionary Algorithm (EA) is presented as an application in Electroencephalography /Event Related Potentials (EEG/ERP) filtering. Process of parameter setting for EA is also explored. A concept of bounded or controlled search space is proposed to identify the best range for search space. Statistical analysis ove...

We recently demonstrated a polarization technique that eliminates the frequency drift due to dielectric charge in MEMS oscillators [1]. In this work we show that these oscillators are also firstorder insensitive to low-frequency voltage noise, with potential for significant positive impact on predicted close-to-carrier phase noise performance. Close-to-carrier noise also determines the limits o...

for a Brownian oscillator, where x(t) specifies the position of the particle or oscillator at time t, m is the mass, ( x is the viscous drag experienced by the particle, lVo is the oscillator frequency, and F(t) is the white-noise driving force. We also consider the rotational analogs of these two models, namely, a free single-axis rotator and a torsional oscillator. The corresponding Langevin ...

This paper proposed an Improved Bacterial Foraging Optimization (IBFO) algorithm to enhance the optimization ability of original Bacterial Foraging Optimization. In the new algorithm, Social cooperation is introduced to guide the bacteria tumbling towards better directions. Meanwhile, adaptive step size is employed in chemotaxis process. The new algorithm is tested on a set of benchmark functio...

We present a rf gas discharge apparatus which provides an atomic frequency reference for laser manipulation of metastable helium. We discuss the biasing and operation of a Colpitts oscillator in which the discharge coil is part of the oscillator circuit. Radiofrequency radiation is reduced by placing the entire oscillator in a metal enclosure.

To analyze a harmonically Van der Pol oscillator, this work used combination of graphs, time steps distribution, adaptive Runge-Kutta, and fourth order algorithms. The goal is to examine the performance third Runge-Kutta algorithms in finding chaotic solutions for excited oscillator. Fourth-order favor larger are thus faster execute than third-order all circumstances studied. accuracy data acqu...

In this chapter, two computational algorithms are proposed and applied on an estimation algorithm, in order to improve the global performance of the estimation phase. The proposed system is studied based on the Model Reference Adaptive System (MRAS). The importance of the estimation phase in a large applications number is basically observed on the applications applied on electrical motors, wher...

sinusoidal. Relaxation oscillator generates the triangular, saw tooth and other non-sinusoidal waveforms. Sinusoidal oscillators consist of amplifiers. 2409Sinusoidal and Non-sinusoidal Oscillators 2409 (e) Heterodyne or beat-frequency oscillator (BFO). The active devices (bipolars, FETs or unijunction. To generate the AC voltage, the oscillator circuit will receive the energy from a DC The Osc...

Femtosecond laser-based generation of radio frequency signals has produced astonishing improvements in achievable spectral purity, one of the basic features characterizing the performance of an radio frequency oscillator. Kerr frequency combs hold promise for transforming these lab-scale oscillators to chip-scale level. In this work we demonstrate a miniature 10 GHz radio frequency photonic osc...