Search results for "Negative resistance"

showing 5 items of 5 documents

Analysis of bias-shift effects in free-running and injection-locked negative resistance oscillators

2012

In this paper, the interaction between DC and RF in quasi-sinusoidal free-running and injection-locked oscillators is addressed. To account for and illustrate in a user-friendly manner the bias-shift related effects stemming from such interaction, a frequency-domain method of analysis has been developed for a rather wide class of negative-resistance circuits. Grounding on a first-approximation exact perturbation-refined approach, it permits computationally efficient simulation of the oscillator behavior directly in terms of the DC and RF signals evolutions (dynamical complex envelopes). In fact, it allows the investigation of both steady-state and transient operation of the shifting-bias dr…

Injection lockingResonatorEngineeringControl theorybusiness.industryNegative resistanceCircuit designFrequency domainRadio frequencyTransient (oscillation)businessElectronic circuit2012 International Conference on Synthesis, Modeling, Analysis and Simulation Methods and Applications to Circuit Design (SMACD)
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Analysis of negative-resistance oscillators with piecewise nonlinearity

1977

An iterative method of solution of negative-resistance oscillators with piecewise-analytical characteristics is presented. The method allows the determination of the frequency and the harmonic content of the waveform as a function of the circuit parameters and bias of the nonlinear device. An application of the method, extended to the second order, for a polynomial characteristic limited by two straight lines is also reported. The results are compared with those obtained by numerical integration.

PolynomialIterative methodApplied MathematicsNegative resistanceMathematical analysisComputer Science ApplicationsElectronic Optical and Magnetic MaterialsNumerical integrationNonlinear systemControl theoryHarmonicPiecewiseWaveformElectrical and Electronic EngineeringMathematicsInternational Journal of Circuit Theory and Applications
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Quasi-sinusoidal oscillations in negative resistance devices with piece-wise analytical characteristics

1976

The second-order approximated solution of a negative resistance oscillator whose active device has a piece-wise analytical characteristic is presented. The frequency and the harmonic content of the oscillation waveform are obtained as functions of the circuit parameters and of the device bias.

Nonlinear oscillatorsControl theoryOscillationNegative resistanceMathematical analysisGeneral EngineeringHarmonicPiecewiseWaveformActive devicesMathematicsIEEE Transactions on Circuits and Systems
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A kinetic interpretation of a negative time constant in impedance equivalent circuits for the dissolution/passive transition

2007

Abstract A theoretical impedance function is proposed for the active/passive transition of nickel in an acid sulphate medium. It is considered that passivating species progressively covers the electrode surface. This approximated model predicts the appearance of negative time constants in the impedance spectra when coverage coefficient θ values for passive species are greater than 0.5.

ChemistryGeneral Chemical EngineeringNegative resistanceElectrodeInorganic chemistryElectrochemistryTime constantEquivalent circuitThermodynamicsKinetic energyElectrical impedanceDissolutionDielectric spectroscopyElectrochimica Acta
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On the dynamical stability of negative conductance free running oscillators

1985

For a class of weakly nonlinear autonomous systems exhibiting both resistive and reactive nonlinearities, asymptotic orbital stability is investigated through a new narrow-band differential approach. The main result is the derivation of the exact characteristic polynomial associated with the local dynamics of the amplitude and phase of the free-running oscillation to be tested. For an nth-order circuit, (n - 1) necessary and sufficient stability conditions are then obtained, in an analytical explicit form suitable for computer implementation, by resorting to conventional Hurwitz test algorithms. A comparison with other differential stability criteria available in the literature is also carr…

Stability conditionsNonlinear systemControl theoryOscillationNegative resistanceMathematical analysisGeneral EngineeringPhase (waves)Differential (infinitesimal)Stability (probability)Characteristic polynomialMathematicsIEE Proceedings G (Electronic Circuits and Systems)
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