A kind of rc oscillator with precharge technology

Abstract

The invention discloses an RC oscillator adopting a pre-charging technology. The RC oscillator circuit includes a main oscillator circuit and a pre-charging control circuit. The main oscillator circuit completes the charging and discharging of the capacitor and provides the output of the oscillator circuit Signal. The pre-charging control circuit measures the loop delay in the main oscillator circuit, and controls the charging process of the main oscillator through the control circuit, so that when one of the branches of the capacitor bank is charged, it can start immediately Start charging the other leg without experiencing a delay. 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 pre-charge control circuit controls the working mode of the main oscillator circuit, so that there is no time interval for charging the two branches of the capacitor, so that The oscillation period of the oscillator does not include the loop delay, thereby compensating the influence of the loop delay on the oscillation period of the oscillator, and improving the accuracy of the output frequency.

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

Images