In this Letter, a strategy for more secure communication using chaotic signals is presented. In this approach, the transmitter is composed by a chain of chaotic oscillator where the input to the first oscillator is modulated by the information signal and the transmitted signal is the output of the last oscillator. The receiver is a linear asymptotic approximation to the inverse of the transmitt...

A low power and low-phase noise quadrature voltage controlled oscillator (QVCO) using the differential complementary Colpitts oscillator topology has been developed. A transformer inductor is used to form a differential output oscillator and the back-gate coupling technique is used to generate quadrature outputs. The advantage of proposed QVCO is analyzed in terms of power consumption, phase no...

The designing of high performance analog circuits is getting more & more challenging with the centre of attention towards reduced supply voltages. In this paper Telescopic OTA is chosen for designing signal processing circuits because it has high gain, high speed and power consumption of this OTA is comparatively low. Signal processing circuits includes Oscillators, Amplifiers and Filters. In O...

In this paper, we propose a synchronization scheme based on an improved auxiliary particle filter (IAPF) for chaotic Colpitts circuit and conduct an experimental study on the synchronization performance with application to secure communications. Specifically, with the synchronization scheme, when the chaotic signals generated by an analog Colpitts circuit are transmitted through a nonideal chan...

Crystal oscillators have huge demand in medical filed especially in building medical devices. They are used in diagnostic equipment, monitoring devices, hearing aids, etc. Since they are widely used in medical devices, it is essential to maintain accurate requirements for the output phase noise of reference frequency source. At the same time it is important to find out new ways to reduce the ph...

An ensemble approach is presented for the reconstruction of a phase synchronization diagram from time series. As an example system, we analyze a forced Colpitts oscillator to show that synchronization diagram reconstructed by a single nonlinear model depends sensitively upon the model parameters, which should be estimated with a considerable amount of care. This dependence can be crucial for a ...

The nonlinear distortion of frequency or phase modulation systems composed by a voltage-controlled oscillator (VCO) modulator and a phase-locked loop (PLL) discriminator is addressed. Volterra series nonlinear transfer functions up to third order, for an LC Colpitts type modulator and a PLL with simultaneous nonlinear phase-detector and VCO, are combined as a cascade of mildly nonlinear systems...