RC oscillating circuit and RC oscillator

Abstract

The invention relates to an RC oscillating circuit and an RC oscillator. The RC oscillating circuit comprises a biasing circuit and an oscillating unit which are connected in sequence; the biasing circuit comprises a first-stage self-adjusting loop and a second-stage self-adjusting loop; the first-stage self-adjusting loop comprises a first voltage drop unit and a first negative feedback circuit; the first negative feedback circuit adjusts the voltage value of the power supply voltage processed by the first voltage drop unit and outputs a negative feedback voltage; the second-stage self-adjusting loop comprises a second voltage drop unit and a second negative feedback circuit; and the second negative feedback circuit adjusts the voltage value of the negative feedback voltage processed by the second voltage drop unit and outputs oscillation voltage used for supplying power to the oscillation unit. The structure of the biasing circuit is simplified, the self-adjusting capacity of the biasing circuit is improved, the purpose of a low-power-consumption high-precision voltage self-adjusting oscillator is achieved, the output frequency precision of the RC oscillator is improved, and circuit integration and multi-occasion application are facilitated.

Description

technical field [0001] The present application relates to the technical field of radio frequency communication, in particular to an RC oscillator circuit and an RC oscillator. Background technique [0002] As a common signal generation circuit, RC (resistor, capacitor) oscillator has the characteristics of simple structure, low power consumption, low cost, and easy integration, and is widely used in on-chip low-frequency clock generation circuits. The RC oscillator uses the resistor-capacitor charge-discharge time-delay unit to oscillate. The generated frequency is greatly affected by the power supply voltage and power supply noise, ambient temperature, and the electrical characteristics of the various components that make up the oscillator. In different applications, Different processes and temperature changes will have an impact on the output frequency accuracy. Therefore, it has become an important research direction to design an oscillator whose output frequency is inde...

AI Technical Summary

Problems solved by technology

[0003] During the implementation process, the inventors found that there are at least the following problems in the traditional technology: the traditional oscillator structure has complex structures, high circuit power consumption, and is not suitable for low-power applications.

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