RC oscillator adopting pre-charging technology

Abstract

The invention discloses an RC oscillator adopting a pre-charging technology, and the RC oscillator circuit comprises a main oscillator circuit and a pre-charging control circuit, wherein the main oscillator circuit completes the charging and discharging of a capacitor and provides an output signal of the oscillator circuit. The pre-charging control circuit measures the loop time delay in the mainoscillator circuit, and controls the charging process of the main oscillator through the control circuit, so that when one branch of a capacitor bank is charged completely, the other branch can be immediately charged, and time delay is not needed. After the delay time is over, the measurement circuit triggers the control circuit to control the main oscillator to return to the normal charging mode;the working mode of the main oscillator circuit is controlled by the pre-charging control circuit, so that the charging of the two branches of the capacitor has no time interval, the oscillation period of the oscillator does not contain loop delay, the influence of the loop delay on the oscillation period of the oscillator is compensated, and the precision of the output frequency is improved.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to an RC oscillator stable to output frequency. Background technique [0002] With the rapid development of communication technology, portable communication devices are more and more widely used. As an integrated on-chip clock source, RC oscillators are more and more commonly studied and designed. To design an RC oscillator with a stable output signal frequency has become an important research topic. Since the loop delay existing in the RC oscillator circuit fluctuates with temperature and other factors, resulting in unstable output frequency of the oscillator, it is very necessary to perform temperature compensation on the output frequency of the oscillator circuit. [0003] Patent CN101977035A discloses an RC oscillator with temperature compensation and offset elimination, including a reference current generation module and a clock signal generation module. Among them, the re...

AI Technical Summary

Problems solved by technology

Since the loop delay in the RC oscillator circuit will fluctuate with temperature and other factors, resulting in unstable output frequency of the oscillator, it is very necessary to perform temperature compensation on the output frequency of the oscillator circuit

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