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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TL;DR: A mathematical model for layered crystals, based on a system of kinetic equations describing the change in charged relaxation oscillators with time, is proposed in this paper, which allows determination of the type and parameters of the oscillators, as well as the properties of the crystals.
Abstract: A mathematical model is proposed for layered crystals, based on a system of kinetic equations describing the change in charged relaxation oscillators with time. An analytical solution of this system is found and a theory constructed, which allows determination of the type and parameters of relaxation oscillators, as well as the properties of the crystals. A calculation of the thermostimulated depolarization current spectrum is confirmed by experiment.
14 Nov 2017
TL;DR: The Quasi Gamma Curve (QGC) model is established based on the fraction-order Relaxation oscillator in the rhythm oscillation and it is certified that the property of QGC model is similar to that of Gamma Curve by curve fitting methods.
Abstract: In this paper, a cortex rhythms mimicking in fractional-order Relaxation oscillator is implemented and the existence of the rhythm is proved. Furthermore, the Quasi Gamma Curve (QGC) model is established based on the fraction-order Relaxation oscillator in the rhythm oscillation and we certify that the property of QGC model is similar to that of Gamma Curve by curve fitting methods. The proposed model is utilized to enhance the low contrast images. Different quantity measures demonstrate that the proposed model is effective.
Patent•
13 Apr 2012
TL;DR: In this paper, a voltage-controlled oscillator with a constant K (vco) in a delta sigma modulator was presented. But the oscillator was not designed for analog-digital converter (ADC) applications.
Abstract: The invention belongs to the technical field of the analog-digital converter (ADC), and in particular relates to a voltage-controlled oscillator with a constant K (vco) in a delta sigma modulator. The voltage-controlled oscillator comprises a voltage-to-current linear converter, a voltage averaging feedback loop, a relaxation oscillator and a starting circuit. Under control of the voltage averaging feedback loop, the frequency of the relaxation oscillator displays a linear relation with current while not influenced by hysteresis of a comparator, and has a small fluctuation along with a process and a temperature simultaneously. Linear conversion from the voltage to the current can be achieved, therefore the finally obtained K (vco) of the voltage-controlled oscillator is a constant value, and a counter is used for quantizing the voltage at last. Linearity of the voltage-controlled oscillator is quite good, therefore the signal to noise ratio (SNR) of the delta sigma ADC is not decreased due to nonlinearity of oscillators finally.
01 Jan 2007
TL;DR: In this article, a signal conditioning circuit suitable for push-pull type capacitive transducers is proposed, which is capable of providing a linear output over a wide range of values of the physical quantity being measured even when the transducer output has an inverse relationship with the measurand.
Abstract: A novel signal conditioning circuit suitable for push- pull type capacitive transducers is proposed. The circuit developed is capable of providing a linear output over a wide range of values of the physical quantity being measured even when the transducer output has an inverse relationship with the measurand. The push- pull type capacitive transducer becomes an integral part of a relax- ation oscillator, the duty cycle ratio of the output of which becomes proportional to the measurand. The various sources of error in the circuit are analyzed, and quantitative expressions to estimate such errors are derived. Results obtained from tests on a prototype in- dicate that the circuit possesses very low errors. Index Terms—Capacitive transducer, relaxation oscillator, signal conditioning.
23 Sep 2022
TL;DR: In this paper , an on-chip 36MHz high precision relaxation oscillator with voltage averaging feedback for MCU (microcontroller unit) applications is presented, which has low temperature shift characteristics in the oscillation frequency range.
Abstract: This paper presents an on-chip 36MHz high precision relaxation oscillator with voltage averaging feedback for MCU (microcontroller unit) applications. The proposed design is fabricated in 0.11-um CMOS process, the relaxation oscillator consumes 78uA. The frequency variation with supply voltage is reduced by a internal LDO(low dropout regulator) circuit, with a wide input range of I.S-5V, the measured frequency variation with supply voltage is within ±0.02%. The measured frequency variations is ±0.2% over a temperature range of −45°C-105°C. It has low temperature shift characteristics in the oscillation frequency range, which is very suitable for MCU’s requirements for multi-system clock frequency.