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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
09 Oct 1973
TL;DR: An oscillator circuit wherein two conductivity cells are arranged in a circuit to provide a conductivity ratio which is converted into a linear variation of the period or frequency of the oscillator is described in this article.
Abstract: An oscillator circuit wherein two conductivity cells are arranged in a circuit to provide a conductivity ratio which is converted into a linear variation of the period or frequency of the oscillator.

22 citations

Patent
07 Feb 1994
TL;DR: In this article, a method for limiting the frequency of a voltage-controlled oscillator in a control circuit of a resonant converter switched-mode power supply includes adjusting a delay time of a delay element disposed in a feedback branch of the oscillator with a signal indicating a transition from negative to positive values of a current through an oscillating circuit of the switched mode power supply.
Abstract: A method for limiting the frequency of a voltage-controlled oscillator in a control circuit of a resonant converter switched-mode power supply includes adjusting a delay time of a delay element disposed in a feedback branch of the voltage-controlled oscillator with a signal indicating a transition from negative to positive values of a current through an oscillating circuit of the switched-mode power supply. A resonant converter switched-mode power supply has an output voltage and an oscillating circuit with a current. A control circuit for the resonant converter switched-mode power supply includes a control amplifier being acted upon by the output voltage and by a reference voltage. A voltage-controlled oscillator is connected to and triggered by the control amplifier. A comparator detects a transition from positive to negative values of the current in the oscillating circuit. A flip-flop has a setting input being connected to and triggered by the voltage-controlled oscillator and has a reset input being connected to and triggered by the comparator. A delay element has a variable delay time and is triggered by a signal indicating a transition from negative to positive values of the current in the oscillating circuit.

22 citations

Journal ArticleDOI
TL;DR: The proposed coupling configurations reveal the importance of the nonisochronicity level of oscillations for the experimentally observed synchronization patterns and also provide efficient ways of tuning the non isochronicite level of the oscillations.
Abstract: Experiments are presented to describe the effect of capacitive coupling of two electrochemical oscillators during Ni dissolution in sulfuric acid solution. Equivalent circuit analysis shows that the coupling between the oscillators occurs through the difference between the differentials of the electrode potentials. The differential nature of the coupling introduces strong negative nonisochronicity (i.e., phase shear, strong dependence of the period on the amplitude) in the coupling mechanism with smooth oscillators (under conditions just above a Hopf bifurcation point). Because of the negative nonisochronicity, asymmetrically coupled oscillators exhibit anomalous phase synchronization in the form of frequency difference enhancement. At strong coupling bistability is observed between in-phase and antiphase synchronized states. With relaxation oscillators, in contrast to the resistive coupling where antiphase synchronization can occur, the typical system response with weak coupling is out-of-phase synchronization. When the capacitance is applied on the individual resistors attached to the electrodes the oscillators exhibit weak positive nonisochronicity; this is in contrast with the strong negative nonisochronicity obtained with cross coupling. The proposed coupling configurations reveal the importance of the nonisochronicity level of oscillations for the experimentally observed synchronization patterns and also provide efficient ways of tuning the nonisochronicity level of the oscillations. This latter feature can be exploited to design synchronization features with a combination of resistive (difference) and capacitive (differential) coupling.

22 citations

Journal ArticleDOI
Yudong Zhang1, Woogeun Rhee1, Taeik Kim2, Ho-Jin Park2, Zhihua Wang1 
TL;DR: The pseudocomparator (PC), which is a variable threshold inverter followed by an inverter, is introduced and a digital calibration circuit is used to automatically set the threshold of the PC for process-insensitive operation in the initial state.
Abstract: This brief describes a pseudodigital oscillator design for low-voltage applications. To overcome the start-up problem of the digitally controlled ring oscillator with an ultralow supply voltage, a digitally controlled relaxation oscillator (DCRXO) that utilizes an inverter-based comparator is proposed. The pseudocomparator (PC), which is a variable threshold inverter, followed by an inverter, is introduced and a digital calibration circuit is used to automatically set the threshold of the PC for process-insensitive operation in the initial state. The DCRXO implemented in 65-nm CMOS consumes 17.8 $\mu\mbox{W} $ from a 0.35-V supply at 26-MHz output and achieves a tuning range of 18.2–29.2 MHz with a sufficient overlap between tuning curves. The phase noise of −104 dBc/Hz at 1 MHz offset is measured at 26-MHz output frequency. When the supply voltage of 0.5 V is used, the DCRXO consumes 59 $\mu\mbox{W} $ at 100-MHz output with the tuning range of 43.5–152 MHz. The core area of the DCRXO is 0.0362 mm2.

22 citations

Proceedings ArticleDOI
16 Sep 2003
TL;DR: An integrated monolithic micromechanical capacitive pressure sensor circuit based on novel method for fabricating pressure detecting vacuum cavities into buried oxide of SOI-wafer is reported.
Abstract: We report an integrated monolithic micromechanical capacitive pressure sensor circuit based on novel method for fabricating pressure detecting vacuum cavities into buried oxide of SOI-wafer. The method allows fabricating the readout circuit with standard bulk CMOS process. The readout circuit of the pressure sensor is a low-power CMOS relaxation oscillator.

21 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202322
202242
202128
202044
201962
201855