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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01 Jan 1994
TL;DR: This model lays a physical foundation for the oscillatory correlation theory of feature binding, and may provide an effective computational framework for pattern segmentation and figure/ground segregation.
Abstract: An novel class of locally excitatory, globally inhibitory oscillator networks (LEGION) is proposed and investigated analytically and by computer simulation The model of each oscillator corresponds to a standard relaxation oscillator with two time scales The network exhibits a mechanism of selective gating, whereby an oscillator jumping up to its active phase rapidly recruits the oscillators stimulated by the same pattern, while preventing other oscillators from jumping up We show analytically that with the selective gating mechanism the network rapidly achieves both synchronization within blocks of oscillators that are stimulated by connected regions and desynchronization between different blocks Computer simulations demonstrate LEGION'S promising ability for segmenting multiple input patterns in real time This model lays a physical foundation for the oscillatory correlation theory of feature binding, and may provide an effective computational framework for pattern segmentation and figure/ground segregation
TL;DR: In this paper, a discharge tube relaxation oscillator placed in a weak microwave field was used to measure the period of the relaxation oscillations in the presence and absence of the microwave field, respectively, as a function of the dc supply voltage and microwave frequency.
Abstract: The oscillations period shift for a discharge tube relaxation oscillator placed in a weak microwave field is reported. The discharge tube consists of a miniature neon lamp. The period of the relaxation oscillations in the presence and in the absence of the microwave field, respectively, as a function of the dc supply voltage and microwave frequency, in the range 1–2.99 GHz, have been measured. The ratio between microwave and dc electric field strength was roughly on the order of 10-3. The measurement results have shown a significant increase of the relaxation oscillations period as an effect of the microwave field.
TL;DR: In this article, relaxation oscillators with microbridges as hysteretic elements are investigated in a frequency range of up to 1 GHz and the signal form of the voltage pulses and the resulting frequency versus bias current dependence are calculated, as well as the frequency spectrum of the harmonics.
Abstract: Relaxation oscillators with microbridges as hysteretic elements are investigated in a frequency range of up to 1 GHz. The signal form of the voltage pulses and the resulting frequency versus bias current dependence are calculated, as well as the frequency spectrum of the harmonics. To demonstrate the possibility of a frequency multiplication, several relaxation oscillators are coupled in a serial or ring configuration. Superconducting delay lines are used to synchronize the oscillators to each other with the proper phase shift. As our measurements show, a frequency multiplication, or at least an enhancement in the power of the desired harmonic is possible in this way.
22 Jun 2003
TL;DR: In this article, the authors presented an analysis of the dynamic operation of the F-P and DFB lasers based on photonic crystal structure, taking into account the gain saturation effect, transverse and longitudinal field distribution.
Abstract: In this paper, for the first time we present an analysis of the dynamic operation of the F-P and DFB lasers based on photonic crystal structure. In our theoretical model, we take into account the gain saturation effect, transverse and longitudinal field distribution. With the help of time dependent laser rate equations, we obtain an approximate formula relating the damping rate and frequency of relaxation oscillations and modulation bandwidth to the output power and laser parameters such as parasitic losses in the active medium and photonic crystal cell geometry. With the help of this relation, laser characteristic showing an optimal reflection for F-P laser and optimal coupling strength for DFB laser, which provide maximal power efficiency for a given laser structure, are obtained. We shown that relaxation oscillations parameters and 3 dB modulation bandwidth strongly depend on values of photonic crystal parameters. We believe that our model of dynamic operation can be useful tool for modeling such laser structures.
TL;DR: In this article, a low-voltage, fully differential MOSFET-C relaxation voltage-controlled oscillator for the frequency tuning of filters is proposed, which is capable of self-startup and provides well-controlled amplitude.
Abstract: A low-voltage, fully differential MOSFET-C relaxation voltage-controlled oscillator for the frequency tuning of filters is proposed. The oscillator is capable of self-startup and provides well-controlled amplitude. The performance of this circuit is demonstrated by simulation results.