Relaxation oscillator

About: Relaxation oscillator is a research topic. Over the lifetime, 1952 publications have been published within this topic receiving 22326 citations.

Delay-controlled relaxation oscillator with reduced power consumption

Abstract: A delay-controlled relaxation oscillator includes a capacitance in the oscillator which is alternately charged and discharged. The change-over from charging to discharging is controlled by means of a comparator which compares the capacitance voltage with a reference voltage. The oscillator also includes switching means for reducing the power consumed by switching the power supply for the comparator from the power supply mode into a stand-by mode between two change-overs.

Relaxation oscillator and core conductor models are needed for understanding of GI electrical activities.

Abstract: This review examines the applicability of modeling of intestinal electrical activities (slow waves or pacesetter potentials) by coupled relaxation oscillator models, in comparison to a “multidimens...

Analysis of emitter (source)-coupled multivibrators

Abstract: The popular emitter-coupled multivibrator and its MOS variant are analyzed using the classical discontinuity theory. Accurate formulas for predicting their relaxation oscillation are obtained solving the nonlinear circuit equation, which is derived finding the voltage-current characteristic of the nonlinearity connected to the timing capacitor. Then, using a small-signal equivalent circuit accounting for the intrinsic capacitances of the devices, we investigate the high-frequency behavior of these circuits finding the oscillation start-up condition. We show that they can exhibit a completely different behavior, similar to a series LC-tuned oscillator, without using an inductor. Numerical simulations are performed showing that the presented formulas are more accurate than the existing ones and that both behaviors are possible

Relaxation Oscillator-Based Active Bridge Circuit for Linearly Converting Resistance to Frequency of Resistive Sensor

Abstract: An easily implementable signal conditioning circuit for resistive humidity and temperature sensors is presented. It is based on a relaxation oscillator in which both the frequency and the duty-cycle of the square-wave output signal simultaneously carry information from two different types of sensors. The output frequency is linearly related to the resistive unbalance of an active bridge, whereas the duty-cycle is independently controlled by a thermal sensor for controlling temperature error of the humidity sensor (RH). The design, analysis, and experimental characterization of the circuit and its application to a sol-gel thin film porous γ-Al2O3-based humidity sensor and resistance temperature detector are reported. Experimental results confirm the theoretical value predicted. The circuit covering wide resistance measurement range has the potential for remotely monitoring measurement parameters accurately.

Multi-mode relaxation oscillator

Abstract: In a relaxation oscillator where the oscillation frequency is proportional to the charge rate of a capacitor, independent current sources are connected through separate switches to change the charge rate of the capacitor and thus the oscillation frequency. Each switch is controlled by signals from a separate detector of a condition which requires that the oscillation frequency be changed. An oscillation frequency increase between the standby and alarm modes of a smoke detector is accomplished in one disclosed embodiment and duty cycle means for controlling the operative period of the alarm indicator during each cycle of the increased oscillator frequency is disclosed in a more particular embodiment.