Topic
Relaxation oscillator
About: Relaxation oscillator is a research topic. Over the lifetime, 1952 publications have been published within this topic receiving 22326 citations.
Papers published on a yearly basis
Papers
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TL;DR: In this article, the authors deal with the generation of sine wave from an active tuned oscillator which consists of the simulated inductor and capacitor, and the simulation is done using the analog simulator software PSPICE.
Abstract: The generation of sine wave at low frequency is very tedious because the size of the inductors used in the circuit is very large and bulky. Hence the inductor is replaced with the simulated inductor. This study deals with the generation of sine wave from an active tuned oscillator which consists of the simulated inductor and capacitor. The oscillator makes use of the basic blocks of a band pass filter using the simulated inductor and a diode limiter. This circuit has the advantage of improving the quality of the wave by increasing the Q-factor of the band pass filter. It also decreases the Total Harmonic Distortion (THD) in the sine wave. The simulation is done using the analog simulator software PSPICE and the total harmonic distortion is calculated using MATLAB.
3 citations
Patent•
29 Oct 1996TL;DR: In this article, a phase-locked loop was used to demodulate a frequency-modulated signal using a local oscillator, where a variable capacitance (Cv) is formed by an electronic module, which supplies the equivalent of a capacitance whose variation as a function of the control voltage has a linearity deviation.
Abstract: Device of the phase-locked loop type for demodulating a frequency-modulated signal. Device for frequency demodulation, using a phase-locked loop. According to the invention, for linearizing the variation of the frequency of a local oscillator (11) as a function of its control signal (Vb), a variable capacitance (Cv) is formed by an electronic module (20) which supplies the equivalent of a capacitance whose variation as a function of the control voltage (Vb) has a linearity deviation which is established for compensating the linearity deviation of the frequency of the oscillator as a function of the value of the capacitance (Cv).
3 citations
07 Aug 2002
TL;DR: In this paper, a square-rooting current-to-frequency converter (CFC) is presented, which uses the current controlled resistor (CCR) in CMOS technology with bisection of the input voltage and one relaxation oscillator.
Abstract: A square-rooting current-to-frequency converter (CFC) is presented in this paper. It has been designed by using the current controlled resistor (CCR) in CMOS technology with bisection of the input voltage, and one relaxation oscillator. CCR is used-instead of the resistor within the relaxation oscillator. In this way, the time constant of the relaxation oscillator is current-controlled. There is no need for a high stable voltage or current references in the proposed circuit. By appropriate setting of the process, parameters of the MOSFETs used, the temperature variations of the output frequency can be made smaller than 7/spl times/10/sup -3/%/K. Experimental results confirm that the behavior of the proposed square-rooting CFC is in good agreement with the predictions of the analysis performed. According to these results, relative errors are less than 1% for the input current range from 35 /spl mu/A to 15 mA, and for the output frequency range from 1.45 kHz to 9.80 kHz.
3 citations
Patent•
NEC1
TL;DR: A simple oscillator circuit is capable of generating a plurality of frequencies that are completely independent of one another, any one of which frequencies can be freely selected as discussed by the authors. But the oscillator may be used as part of an electronic ringer for a telephone, for example.
Abstract: A simple oscillator circuit is capable of generating a plurality of frequencies that are completely independent of one another, any one of which frequencies can be freely selected. The oscillator may be used as part of an electronic ringer for a telephone, for example. The oscillator circuit includes a capacitor which is charged from a current source. A discharge constant current circuit discharges the charge from the capacitor. A comparator compares the charge voltage on the capacitor with a first or a second reference voltage. In response to the output of the comparator, a reference voltage switching control circuit supplies the first or second reference voltage to the comparator and controls the turning on and off of the discharge constant current circuit. A control constant current source controls the current from the charge current source for charging the capacitor. The frequency of the output signal from the comparator is controlled by regulating the control constant current source to switch the current capacity of the charge current source.
3 citations
TL;DR: In this paper, a relaxation oscillator with a hysteresis element and periodic variation of the threshold is analyzed, and the parameter regions are clarified where the system exhibits a periodic solution or quasi-periodic solutions and where the response characteristics of the system having periodic solutions becomes devil's stair and where attractors may coexist.
Abstract: A relaxation oscillator which includes a hysteresis element with periodic variation of the threshold is analyzed. Deriving a one-dimensional return map, the parameter regions are clarified where the system exhibits a periodic solution or quasi-periodic solutions and where the response characteristics of the system having periodic solutions becomes devil's stair and where the attractors may coexist. When the system has chaotic response, then coexistence of chaotic and periodic attractors is confirmed. Various results are confirmed from the laboratory experiments.
3 citations