Crystal oscillator circuit and chip

Abstract

The invention belongs to the field of integrated circuit design, and provides a crystal oscillator circuit and a chip. With the adoption of the crystal oscillator circuit comprising a crystal oscillator, an oscillation response unit, a bias current supply unit, an NMOS (N-channel metal oxide semiconductor) tube Mn1, a current mirroring unit and a negative feedback unit, the oscillation amplitude of the crystal oscillator can be adjusted automatically after the crystal oscillator normally starts oscillation, so that the power consumption is reduced; and simultaneously, when the crystal oscillator abnormally oscillates, the oscillation amplitude of the crystal oscillator can be adjusted adaptively, and the purpose of normal oscillation start is achieved, so that high accuracy of output frequency of the crystal oscillator is guaranteed, and problems of low accuracy of output frequency and high power consumption in the prior art are solved.

Description

technical field [0001] The invention belongs to the field of integrated circuit design, in particular to a crystal oscillator circuit and chip. Background technique [0002] As a high-precision and high-stability oscillator, crystal oscillators can provide highly accurate reference clock signals for various electronic systems, and are widely used in various handheld devices and portable electronic products. [0003] In the oscillator circuit provided by the prior art, a simple inverter is used, and the static operating point of the inverter is determined through a large-value feedback resistor, and a negative feedback loop is formed at the same time, so that The crystal oscillator starts up normally and works stably. However, in order to ensure that the crystal oscillator can normally start to vibrate under harsh working conditions, the size of the inverter in the prior art will be made very large. Although this can make the crystal oscillator work stably, it will make the ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a crystal oscillator circuit, aiming to solve the problems of low output frequency accuracy and excessive power consumption in the prior art

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