Topic
Relaxation oscillator
About: Relaxation oscillator is a research topic. Over the lifetime, 1952 publications have been published within this topic receiving 22326 citations.
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Papers
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02 Apr 1979TL;DR: In this paper, a CMOS Schmitt trigger circuit displays a lower trigger point that is one N channel transistor threshold above the negative power supply potential and an upper trigger point, which is one P channel threshold below the positive power supply maximum potential.
Abstract: A CMOS Schmitt trigger circuit displays a lower trigger point that is one N channel transistor threshold above the negative power supply potential and an upper trigger point that is one P channel transistor threshold below the positive power supply potential. Thus, the circuit hysteresis loop is related to supply potential and device threshold values. When the trigger circuit is employed in a relaxation oscillator configuration, the oscillator frequency is independent of power supply voltage and manufacturing variables in the CMOS process that vary transistor threshold values.
23 citations
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20 Dec 2016TL;DR: In this article, an oscillation signal generation circuit includes an external phase comparator which performs phase comparison between an input signal and the reference signal in a first mode, and generates the oscillation signals using the frequency control data based on a result of the phase comparison from the internal phase comparators in a second mode.
Abstract: A circuit device includes an oscillation signal generation circuit, a reference signal input terminal to which a reference signal is input, and an internal phase comparator that performs phase comparison between an input signal based on the oscillation signal and the reference signal. The oscillation signal generation circuit generates the oscillation signal using the frequency control data based on a result of the phase comparison from an external phase comparator which performs phase comparison between an input signal based on the oscillation signal and the reference signal in a first mode, and generates the oscillation signal using the frequency control data based on a result of the phase comparison from the internal phase comparator in a second mode.
23 citations
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25 Oct 2012TL;DR: In this paper, a fast and accurate simulation technique to evaluate the impulse sensitivity function (ISF) of an oscillator is presented, based on the linear-time variant (LTV) analysis of oscillators.
Abstract: This paper presents a fast and accurate simulation technique to evaluate the impulse sensitivity function (ISF) of an oscillator. The proposed method, based on the linear-time variant (LTV) analysis of oscillators, computes the impulse phase response by means of periodic steady-state (PSS) and periodic transfer function (PXF) simulations available in commercial simulators (Spectre, Eldo, etc.). This technique overwhelms the classical simulation method based on transient analysis and injection of charge pulses along the oscillator period in terms of speed, precision and ease of use. The good accuracy of the proposed method has been verified in two oscillator topologies, namely a Van der Pol and a ring oscillator.
23 citations
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TL;DR: An analysis of the deterministic and noise-dependent dynamics of a ring of three Ohmically coupled electronic relaxation oscillators shows that nontrivial periodic attractors are observable in the vicinity of the inhomogeneous stable steady states only if the level of noise is relatively low.
Abstract: The deterministic and noise-dependent dynamics of a ring of three Ohmically coupled electronic relaxation oscillators are considered by means of numerical simulations. Each isolated oscillator is described by a set of two ordinary differential equations with very different characteristic times. The emergence of the limit cycle via the Hopf bifurcation results from the N-shaped current-versus-voltage characteristic of the nonlinear resistor. The phase diagram is calculated for a ring of three such oscillators in the presence of small detuning. Special attention is focused on two parameter areas, one near a transition to the homogeneous and the other near the inhomogeneous stable steady state. Along with other nontrivial limit cycles, essentially asymmetrical limit cycles termed dynamic traps may arise in these two areas. A dynamic trap is a regime in which one or two oscillators do not perform full-amplitude oscillations and, correspondingly, do not generate spikes. The interspike interval (ISI) distribution in the presence of noise is calculated as a function of the coupling strength in both areas of the parameter plane. The distributions are extremely polymodal near the homogeneous steady state even if the in-phase limit cycle is dominating. The origins of this abnormal enhancement of ISI variability are discussed in detail. A similar analysis shows that nontrivial periodic attractors are observable in the vicinity of the inhomogeneous stable steady states only if the level of noise is relatively low. In this case, the dominance of the in-phase limit cycle basin results in an almost unimodal distribution of interspike intervals.
23 citations
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TL;DR: In this article, a simple and versatile electronic interface circuit for sensors is presented, which is based on a relaxation oscillator in differential configuration, and it can be applied to resistive, capacitive and inductive sensors or detectors.
Abstract: A simple and versatile electronic interface circuit for sensors is presented. The novel interface circuit is based on a relaxation oscillator in differential configuration. In such a configuration, the sensitivity is strongly increased and compensations are made possible. It can be applied to resistive, capacitive and inductive sensors or detectors. Experimental and simulation results confirm the theory built up. High sensitivity is measured. Non-idealities of electronic components set the limit of attainable sensitivity.
23 citations