Crystal oscillation circuit and method and electronic equipment

Abstract

The embodiment of the invention relates to the field of circuit design, and particularly relates to a crystal oscillation circuit and method and electronic equipment. The crystal oscillation circuit disclosed by the invention comprises an excitation signal generator, a broadband modulator and an oscillation amplitude detector, wherein the excitation signal generator is used for generating an excitation signal after a crystal oscillator is enabled, and inputting the excitation signal into the broadband modulator; the broadband modulator is used for modulating the excitation signal to generate amodulation signal and inputting the modulation signal into the crystal oscillator, and the difference between the frequency of the modulation signal and the frequency of the crystal oscillator is within a preset range; the oscillation amplitude detector is used for detecting the amplitude of an output signal of the crystal oscillator, and if the amplitude of the output signal of the crystal oscillator exceeds a preset amplitude value, the broadband modulator stops inputting the modulation signal to the crystal oscillator. According to the invention, by shortening the oscillation starting timeof the crystal oscillator and reducing the average consumption of the circuit, rapid oscillation starting is realized, resources are saved, and the service life of the device is prolonged.

Description

technical field [0001] The embodiments of the present invention relate to the field of circuit design, in particular to a crystal oscillation circuit, method and electronic equipment. Background technique [0002] A crystal oscillator refers to a thin slice (referred to as a wafer) cut from a quartz crystal at a certain azimuth angle, and an IC is added inside the package to form a crystal component of an oscillator circuit. Quartz crystal resonators are referred to as quartz crystals or crystals. Because the quartz crystal has a very high quality factor, the quartz crystal oscillator can generate an oscillation waveform with accurate frequency and stability, and is widely used in clocks and watches, military industry, communication and other fields that require high oscillation frequency. [0003] In recent years, the design requirements for low-power and low-cost integrated circuits in various fields have become increasingly prominent. The chip of the integrated circuit h...

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Problems solved by technology

However, the inventors have found that there are at least the following problems in the prior art: generally used crystal oscillators have the disadvantage of slow start-up, and take a long time to complete the start-up, generally between several milliseconds to tens of mi

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