RC vibrator

Abstract

The application provides an RC oscillator, including a reference voltage generation unit used for generating a reference voltage; a voltage control relaxation oscillation unit including a first constant current source and a first charge-discharge loop and a second charge-discharge loop, wherein the first constant current source is used for alternately charging the first charge-discharge loop to generate a first oscillation signal or a second oscillation signal, the first oscillation signal and the second oscillation signal are superposed to obtain a third oscillation signal, and the first charge-discharge loop and the second charge-discharge loop are symmetrical in structure; an active filter unit used for integrating the reference voltage and the third oscillation signal to obtain a fourth signal; and a voltage control unit used for comparing the fourth signal and the first oscillation signal to generate a fifth signal, or comparing the fourth signal and the second oscillation signal to generate a sixth signal.

Description

technical field [0001] The present application relates to the field of electronic technology, and more particularly, to a resistor-capacitor (RC) oscillator. Background technique [0002] In systems such as biological information detection chips and low-power standard wireless transmission chips, a high-precision clock is usually required to realize the high-precision timing function required by the system. [0003] The circuit structure of a traditional RC oscillator includes a voltage-to-current unit, a bandgap reference unit, an active filter unit and a symmetrical voltage-controlled relaxation oscillation unit. Among them, the voltage-to-current unit is used to input current for the symmetrical voltage-controlled relaxation oscillation unit; the symmetrical voltage-controlled relaxation oscillation unit usually includes two symmetrical charging and discharging loops including a voltage source, and outputs two voltages V1 and V2; the bandgap reference unit is used to gen...

AI Technical Summary

Problems solved by technology

Among them, the voltage-to-current unit is used to input current for the symmetrical voltage-controlled relaxation oscillation unit; the symmetrical voltage-controlled relaxation oscillation unit usually includes two symmetrical charging and discharging loops including a voltage source, and outputs two voltages V1 and V2; the bandgap reference unit is used to generate a reference voltage; the active filter unit uses the superimposed signals of V1 and V2 and the reference voltage as positive and negative inputs and forms a negative feedback loop with the output of the active filter unit, so that the output frequency accuracy is relatively high High signal, but the structure of the circuit structure of the traditional RC oscillator is relatively complicated

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