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In this paper, we provide a novel approach to describe and analyze memristive circuits. This method is based on a Volterra series representation of the essential time functions of the circuit. This does not only provide the possibility of calculating voltages and currents over time in specific memristive networks, but describes the behavior of a general single memristor circuit, e.g. a circuit with...
This paper describes an original experimental procedure to extract the oscillator's phase sensitivity to injected noise perturbations. The proposed method relies on measuring the width of the locking ranges over which the oscillator's response synchronizes with an injected small-amplitude signal. The extraction procedure is applied to a relaxation oscillator which exhibits a strongly nonlinear behavior.
The paper introduces a novel sinusoidal quadrature oscillator (QO) with low harmonic distortion. The oscillator utilizes the non-linear non-inertial principle for amplitude stabilization and thus a fast transition to 0 steady state oscillations should be accomplished. This feature makes the QO suitable for operation at very low frequencies. The oscillator operates in the current-mode and is is intended...
A method to analyze the injection locking and injection pulling of arbitrary oscillators under small excitation is proposed. The most general case when the excitation frequency is close to a rational fraction of the oscillator fundamental is considered. The phase differential equation for an arbitrary periodic excitation is derived. Expressions to evaluate characteristics of the oscillator in injection...
An event-driven, clock-free analog-to-digital converter (ADC) based on a continuous-time delta modulation technique is presented in this work. The ADC output is a digital datum, continuous in time. The ADC system employs an unbuffered, area efficient segmented resistor-string digital-to-analog converter (DAC). Simulation results of the high level model of an 8-bit event-driven DM ADC system is presented...
In this paper a 10-bit, 5kHz bandwidth, continuous time ADC, which employs level-crossing sampling to convert an analog signal to a digital one, is presented. The proposed level-crossing ADC does not use any clock and sampling in time is not involved. The level-crossing ADC acquires samples only when they provide a new information about the input signal, thus dissipating power only when needed. Cadence...
This paper describes how a novel distortion contribution analysis can be used efficiently for improving the linearity of a nonlinear circuit. The distortion analysis technique called Volterra-on-Harmonic-Balance calculates a distortion contributions in each tone and node for each nonlinear elements of the nonlinear devices in the circuit. As the analysis provides large amount of data, also the flow...
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