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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16 Apr 2003
TL;DR: In this article, a low noise relaxation oscillator was used to generate reference current and voltage by an outward resistor, to filter noise of the reference voltage by a filter circuit to get stable grid voltage as the control voltage of the current mirror circuit.
Abstract: This invention discloses a low noise relaxation oscillator to generate reference current and voltage by an outward resistor, to filter noise of the reference voltage by a filter circuit to get stablegrid voltage as the control voltage of the current mirror circuit to get stable two oscillation currents by mirroring the reference current to be inputted into the oscillation circuit together with the grid voltage. The said two oscillation currents flow through two oscillation capacitors respectively and the two oscillation capacitors and the grid voltage compare the voltage with two comparatorsto generate interactive signal to output, so as to effectively improve flutter and operation period efficiency of the clock pulse.
3 citations
TL;DR: In this article, a new method of control based on state energy concept is proposed, which will show that system controlled by a linear controller with energy feedback can generate different types of signals.
Abstract: There are many types of oscillators and many different circuit configurations that produce oscillations. Some oscillators produce sinusoidal signals, and others produce nonsinusoidal signals. Nonsinusoidal oscillators, such as pulse and ramp (or sawtooth) oscillators, find use in timing and control applications. Pulse oscillators are commonly found in digital-systems clocks, and ramp oscillators are found in the horizontal sweep circuit of oscilloscopes and television sets. Sinusoidal oscillators are used in many applications, for example, in consumer electronic equipment (such as radios, TVs, and VCRs), in test equipment (such as network analyzers and signal generators), and in wireless systems. There are two widely used methods of oscillator amplitude control. In the first method, the oscillator active element has a nonlinear characteristic of the limiting type. In the second method the oscillator active element has linear control of gain. In this paper a new method of control based on state energy concept is proposed. It will show that system controlled by a linear controller with energy feedback can generate different types of signals. Depending on parameters of the controller the generated output signal can be sinusoidal, nonsinusoidal, or even chaotic. A new chaotic attractor was found by means of state energy feedback.
3 citations
01 Oct 2016
TL;DR: In this article, a temperature and supply independent on-chip relaxation oscillator is presented, which exhibits frequency variation of 0.22% for supply changes from 1.62 to 1.98V, and 0.49% for temperature changes from −40°C to 125°C.
Abstract: A temperature and supply independent on-chip relaxation oscillator is presented. This oscillator is designed in TSMC 180nm CMOS process with a supply voltage of 1.8V and consumes 98uW at 25MHz. Simulation results show that the oscillator exhibits frequency variation of 0.22% for supply changes from 1.62 to 1.98V, and 0.49% for temperature changes from −40°C to 125°C.
3 citations
01 Apr 1941
TL;DR: In this article, a method for stabilizing the frequency of a relaxation oscillator to any required degree is described, and the oscillator may be synchronized with a high-order submultiple of a control frequency without any possibility of synchronization at any other submultiple, even if the operating conditions vary widely; the maintenance of synchronization can also be made substantially independent of operating conditions.
Abstract: A method is described for stabilizing the frequency of a relaxation oscillator to any required degree. The stabilized oscillator may be synchronized with a high-order submultiple of a control frequency without any possibility of synchronization at any other submultiple, even if the operating conditions vary widely; the maintenance of synchronization can also be made substantially independent of operating conditions.
3 citations