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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.


Papers
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Proceedings ArticleDOI
15 May 2011
TL;DR: A new RC relaxation oscillator with pulse self biasing, to reduced power consumption, and with harmonic filtering and resistor feedback, to reduce phase-noise is presented.
Abstract: We present a new RC relaxation oscillator with pulse self biasing, to reduce power consumption, and with harmonic filtering and resistor feedback, to reduce phase-noise. A circuit prototype in the hundreds of MHz range, designed in a 130 nm CMOS technology has a very low phase-noise, −132.6 dBc/Hz @ 10 MHz offset, and the power consumption is only 1 mW, which leads to a figure of merit (FOM) of −159.1 dBc/Hz.

8 citations

Journal ArticleDOI
TL;DR: This work presents high resolution and adaptable frequency measurement techniques for relaxation oscillator based capacitive sensors and shows that the 1-bit comparator along with the CS approach provides the best performance across all input amplitude, frequency and shapes.
Abstract: This work presents high resolution and adaptable frequency measurement techniques for relaxation oscillator based capacitive sensors. The techniques rely on extremely simple hardware such as a 1-bit coarse voltage quantizer to generate a 1-bit data stream and subsequently determine frequencies with resolutions greater than 20 bits from the 1-bit data stream. The proposed readouts are based on two types of 1-bit hardware approaches with Nyquist sampling in one approach and oversampling in the other. The first approach employs a Nyquist rate sampled 1-bit comparator while the second approach relies on an oversampled 1-bit quantizer based delta-sigma modulator (DSM) as a hardware to generate the bit stream. High resolution frequency is estimated from the 1-bit data stream using parametric, non-parametric and compressed sensing approaches. We provide detailed study and measurement results comparing the performance of the proposed techniques for test inputs with different frequencies and amplitudes and multiple signal shapes including sine, square, triangular and sawtooth. We show that the 1-bit comparator along with the CS approach provides the best performance across all input amplitude, frequency and shapes. A capacitive water level sensor was implemented in a PCB and embedded in a conventional square wave relaxation oscillator to verify the proposed technique. Measurement results show that incremental SNRs can be achieved only by increasing the 1-bit data stream length without any change in the hardware thereby demonstrating the adaptability of the technique based on an application requirement.

8 citations

Proceedings ArticleDOI
14 Aug 1989
TL;DR: Multivibrators based on operational transconductance amplifiers (OTA) based on astable bridge multivibrator with one OTA and the circuits with bipolar and MOS OTAs are treated.
Abstract: Multivibrators based on operational transconductance amplifiers (OTA) are considered. The first is an astable bridge multivibrator with one OTA. This circuit is useful for two-wire bridge-to-frequency converters. The second circuit is an astable multivibrator with two OTAs. This circuit provides a linear dependence of the oscillation frequency on the sensor control current. Both circuits are nonsaturated multivibrators. Calculation of their oscillation frequency involves a linear model which describes the circuit behavior near the transition point from one quasistable state to another. The circuits with bipolar and MOS OTAs are treated. >

8 citations

Journal ArticleDOI
TL;DR: In this paper, fundamental phenomena from three coupled relaxation oscillators are analyzed and a rough bifurcation diagram is given, indicating that 3-torus is popular for weak coupling and chaos is more popular for relatively strong coupling.
Abstract: This paper analyzes fundamental phenomena from three coupled relaxation oscillators. The system nonlinearity is a piecewise linear hysteresis comparator and we can explicitly calculate the return map and its Lyapunov exponents. Then we clarify generation of chaos, 2-torus, 3-torus and various kinds of synchronizations. Also, a rough bifurcation diagram is given. It indicates that 3-torus is popular for weak coupling and chaos is popular for relatively strong coupling. Some of the phenomena are confirmed by laboratory measurements. >

8 citations

Patent
03 Jun 2003
TL;DR: In this article, a variable reference voltage was used to compensate for propagation delay in a tunable oscillator caused by delays in the electronic components, and the reference voltage is decreased as the control current increases and varied in frequency to match the phase of the oscillator.
Abstract: The present invention uses a variable reference voltage to compensate for propagation delay in a tunable oscillator caused by delays in the electronic components. The reference voltage is decreased as the control current increases and is varied in frequency to match the phase of the oscillator.

8 citations


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