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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Patent•
19 Dec 1974
TL;DR: In this article, a triggering element such as a thyristor triggered from a relaxation oscillator and an electrical igniter is described. But this system is not suitable for the automatic stopping of the triggering pulses supplied by the oscillator.
Abstract: The invention relates to systems comprising a triggering element such as a thyristor triggered from a relaxation oscillator and relates more particularly to an electrical igniter. In this system means are provided for ensuring the automatic decrease of the intensity of the triggering pulses supplied by the oscillator so that triggering automatically stops after a predetermined time. These means comprise a timing mechanism formed by a resistance inserted in series in the discharge circuit of the oscillator with a capacitor and diode in parallel on the said resistance, the diode being oriented so as to charge the capacitor under the action of pulses supplied by the oscillator. The invention can be applied to an igniter for gas burners.
6 citations
09 Jul 2014
TL;DR: A low-voltage low-power LC-tank oscillator design using the symmetric graphene tunneling field-effect transistor (SymFET) diode is presented, with a large current peak exhibiting negative differential resistance (NDR) when the drain-to-source voltage aligns the Dirac point.
Abstract: In this paper, a low-voltage low-power LC-tank oscillator design using the symmetric graphene tunneling field-effect transistor (SymFET) diode is presented. The SymFET takes advantage of the resonant current tunneling through two graphene layers, with a large current peak exhibiting negative differential resistance (NDR) when the drain-to-source voltage aligns the Dirac point. A Verilog-A SymFET model is presented with noise performance for circuit design and evaluation. The NDR phenomenon of the diode-connected SymFET is further explored, and oscillator design considerations are discussed for performance optimization. Simulation results show that the proposed SymFET 3.05 GHz oscillator has a simulated phase noise of -117 dBC/Hz at 1.0 MHz offset, with a power consumption of only 0.23 mW from a 0.30 V supply.
6 citations
Patent•
15 May 1972
TL;DR: In this paper, a siren system with a semi-conductor device, which acts as a variable resistance, is coupled to the basic oscillating circuit and is modulated by a relaxation oscillator.
Abstract: A siren system in which a sound producing transducer is coupled to a basic oscillating circuit through a push-pull amplifier and a semiconductor phase inverter. The basic oscillating circuit is modulated by a relaxation oscillator. A semi-conductor device, which acts as a variable resistance, is connected in a resistance-capacitance circuit of the basic oscillating circuit and is coupled to the relaxation oscillator.
6 citations
Patent•
13 May 1970TL;DR: A voltage regulator for brushless alternators including an oscillator circuit which has the output thereof fed into stationary, primary winding of a rotary transformer device which has a rotatable secondary winding secured to the rotor shaft of the alternator is described in this article.
Abstract: A voltage regulator for brushless alternators including an oscillator circuit which has the output thereof fed into stationary, primary winding of a rotary transformer device which has a rotatable secondary winding secured to the rotor shaft of the alternator. The oscillator is a free running, square wave multivibrator with cross coupling means between the output of one transistor stage thereof to the input of the other transistor stage. The oscillator operates at a frequency within a given range of frequencies dependent on load conditions, and the output of the oscillator is controlled by a voltage sensor between fully on and fully off conditions to regulate the power output of the alternator.
6 citations
Patent•
20 Sep 2011TL;DR: A relaxation oscillator for generating a first and a second oscillation signal was proposed in this paper, where the first and second digital signals were digital control signals to the switches, and the oscillation frequency was independent of the reference voltages, achieving accurate frequency turning, and simplifying the reference voltage providing circuit.
Abstract: A relaxation oscillator for generating a first and a second oscillation signals, comprising: a reference-voltage providing circuit for providing a high and a low reference voltages; switches for directing the high and low reference voltages to inputs of a transconductance amplifier and a non-inverting input of a comparator; the transconductance amplifier for generating an output current with a value determined by its transconductance value, controlled by an input tuning voltage, and multiplied by its inputs' voltage difference; a capacitor connecting between the transconductance amplifier output and ground; and the comparator for generating a first and a second digital signals; wherein the first and second digital signals are digital control signals to the switches, and the first and second oscillation signal of the relaxation oscillator respectively; wherein the oscillation frequency of the relaxation oscillator is independent of the reference voltages, achieving accurate frequency turning, and simplifying the reference-voltage providing circuit.
6 citations