Relaxation oscillator

About: Relaxation oscillator is a research topic. Over the lifetime, 1952 publications have been published within this topic receiving 22326 citations.

Low-Power Microwave Relaxation Oscillators Based on Phase-Change Oxides for Neuromorphic Computing

Abstract: Neuromorphic computing is an efficient solution for large-scale associative learning problems such as pattern recognition, but its hardware implementation is stymied by the need for low-power, scalable faux neurons, typically built using relaxation oscillators. This work proposes relaxation oscillators using VO${}_{2}$-based heterostructures with optimized thermal time constants for low-power operation at microwave frequencies. Synchronization behavior between two coupled oscillators is also investigated. This study offers a theoretical foundation for the use of such oscillators in neuromorphic computing.

Method for measuring the ratio of a measurement-quantity-dependent capacitance and a reference capacitance and device for carrying out the method

Abstract: The measurement is carried out by converting the capacitance values into a signal oscillation and calculating the ratio of the frequency values. The two capacitances (C1, C2), for example of a capacitive force sensor, are alternately switched into the input circuit of a measurement-quantity converter (2) with a frequency (10 Hz) which is smaller by orders of magnitude than the centre frequency (16 kHz) of the signal oscillation. In this process, the frequency values (f1, f2) of the signal oscillations occurring in succession are measured by counting out the periods in a fixed time interval corresponding to the respective on-time (100 ms) of one capacitance. Using a relaxation oscillator with the capacitance to be measured as the frequency-determining quantity, in which in each case only a centre ramp section of the charging voltage across the capacitance is utilised for the measurement, this method can be used for achieving high measuring accuracies.

A new approach to determine the start-up time of sinusoidal oscillators

Abstract: A transient waveform leaving the metastable equilibrium of a flipflop exhibits a very similar shape like the rising amplitude of an LC oscillator in the start-up phase. This paper is used to develop a new approach to determine the start-up behavior of nearly sinusoidal oscillators.

Analysis of Oscillators for the Generation of Rhythmic Patterns in Legged Robot Locomotion

Abstract: This paper presents a study of several oscillators for the generation of rhythmic patterns that are used in the locomotion of legged robots using a central pattern generator (CPG). This work also shows a comparative analysis of these oscillators focused on their implementation as part of the CPG system, based on simulations made using software tools. Three models were implemented and simulated: the Hopf model as an example of a harmonic oscillator, a reflexive oscillator using the Van der Pol oscillator, and the ACPO (amplitude coupled phase oscillator) corresponding to the phase oscillators category. It is established that a phase oscillator is the best choice when working with CPGs offering a simple yet versatile way to connect the limbs.

Relaxation-oscillator detection of optogalvanic spectra.

Abstract: A neon bulb used in a relaxation oscillator is a sensitive detector for observing optogalvanic spectra of neon. A few percent change in the oscillation frequency was observed with resonant irradiation of tenths of microwatts for some neon lines. The percent change is greater than the corresponding current change in an ordinary optogalvanic detection by 2 orders of magnitude. The new technique, not requiring a lock-in amplifier and a special sample cell, probably provides the simplest and the cheapest method for calibrating wavelengths.