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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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Proceedings ArticleDOI
01 Feb 2016
TL;DR: A relaxation oscillator is presented that makes use of a current-mode Schmitt trigger to reduce the effects of process, voltage and temperature (PVT) variations and a detailed analysis of the oscillator, including the temperature performance, is presented.
Abstract: A relaxation oscillator is presented that makes use of a current-mode Schmitt trigger to reduce the effects of process, voltage and temperature (PVT) variations. A detailed analysis of the oscillator, including the temperature performance, is presented and verified by experimental results. A test chip with a typical frequency of 32 kHz was fabricated in a 0.18 μm standard CMOS process. The measured frequency variations were +/− 30 ppm/°C for temperature variation from −20 °C to 80°C and +/− 500 ppm/V for supply voltage variation from 0.7 V to 1.8 V. The short term stability is 66 ppm (2 ns) of jitter while the long term stability is 500 ppm of Allan deviation after 10 seconds. A careful design results in a total area of 0.1 mm2 and a power consumption of 150 nW.

4 citations

Patent
14 Sep 1982
TL;DR: In this paper, the static capacitance of the ultrasonic wave oscillator was used to improve the pulse response at pulse drive of an ultrasonic oscillator by connecting a coil oscillating a parallel resonance frequency being approximate to a resonance frequency of the UW oscillator in parallel with the UAW oscillator.
Abstract: PURPOSE:To improve the pulse response at pulse drive of an ultrasonic oscillator, by connecting a coil oscillating a parallel resonance frequency being approximate to a resonance frequency of the ultrasonic wave oscillator in parallel with the ultrasonic oscillator by means of the static capacitance of the ultrasonic wave oscillator. CONSTITUTION:The ultrasonic wave oscillator 1 has a static capacitance C0, the C0, a capacitor C1 and the inductance of coils L1, L2 consitute a parallel responance circuit and the resonance frequency is designed so as to be close to a resonance frequency f0 of the ultrasonic wave oscillator 1. Since the impedance at a frequency (f) viewed from both ends of the ultrasonic wave oscillator 1 is minimized at the f0, the echo time is reduced remarkably. The capacitor C1 is for temperature compensation and connected in parallel with the ultrasonic wave oscillator 1 so as to reduce the change in the total capacitance and to eliminate the change of the resonance frequency of the parallel resonance circuit comprising the coils L1, L2 due to temperature. Since the transmitted signal is large, diodes D1, D2 are low in the impedance, and since the received output signal is small, the D1, D2 are high in the impedance, and the single ultrasonic wave oscillator 1 is used in common for the receiving and transmission.

4 citations

Proceedings ArticleDOI
12 May 1996
TL;DR: Results are presented for a study of the complex behavior of several coupled electronic relaxation oscillators; a network of electronic neurons designed to simulate the dynamics of a cat retina; and an array of coupled nonlinear oscillators that can perform scene segmentation and pattern recognition.
Abstract: The dynamics of coupled nonlinear oscillators are extremely rich and important for a large variety of physical, technological, and biological systems. We present results for three different applications: a study of the complex behavior of several coupled electronic relaxation oscillators; a network of electronic neurons designed to simulate the dynamics of a cat retina; and an array of coupled nonlinear oscillators that can perform scene segmentation and pattern recognition.

4 citations

Patent
16 Jul 2008
TL;DR: In this article, a chip-built-in RC time constant correction method was proposed for an integrated circuit tuner, where the image signal filteration function of the multiphase filter and the oscillating period of the relaxation oscillator are controlled by a chip built-in Rc time constant.
Abstract: The invention relates to a chip built-in RC time constant correction method used in an integrated circuit tuner, wherein the integrated circuit tuner comprises a receiving circuit receiving radio frequency signal, an orthogonal frequency mixer coupled in the output end of the receiving circuit, a multiphase filter, a relaxation oscillator and a digital correction module, wherein the image signal filteration function of the multiphase filter and the oscillating period of the relaxation oscillator are controlled by a chip built-in RC time constant. The correction method comprises the following steps: a clock in direct proportion to the chip built-in RC time constant is generated; the clock is input in the counter arranged inside the digital correction module; within a preset time slot, the clock cycle is counted to generate a counting value; moreover, by means of continuous approximation correction method and according to the counting value, the chip built-in RC time constant is updated.

4 citations

Proceedings ArticleDOI
14 May 2018
TL;DR: A simple, novel interfacing scheme for linear variable differential transformer (LVDT) that does not require a precise sine wave oscillator for excitation or any phase matching circuit like traditional methods is presented.
Abstract: This paper presents a simple relaxation oscillator based read-out circuit for Linear Variable Differential Transformer (LVDT). The new scheme does not require precise sine wave oscillator for excitation and the associated phase matching circuits like the traditional methods. The scheme is designed to perform ratiometric computation of the sensing variables and provides an output that is proportional to the measurand, displacement. The primary and the secondary coils are integral parts of a Relaxation Oscillator (RO). The RO injects a current waveform with triangular shape through the primary. This induces a square shape waveform in the secondary coils. The RO utilizes the amplitudes of those waveforms to derive the core position and represents it as a change in duty cycle of the output signal. The PWM output lends itself to easy digitization of the displacement using an up/down counter. Or, if analog output is required, the PWM output can be passed through a low pass filter and the same can be obtained. A prototype of the proposed read-out circuit has been built and tested (a) using standard variable inductors emulating the change in the value of the inductances of an LVDT and (b) a commercially available LVDT. The worst case non-linearity error noted from the tests conducted was less than 0.3 %.

4 citations


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