A method and circuit structure for detecting whether a crystal oscillator circuit starts to oscillate

Abstract

The invention provides a method for detecting whether a crystal oscillator circuit starts oscillation or not and a circuit structure. The method comprises the steps that a loop gain simulation method is adopted for setting the scanning frequency of a frequency generator, the parameter values of a loop capacitor, a loop inductor, a feedback resistor, a first load capacitor and a second load capacitor are given, the simulation process is started, and a loop gain curve is obtained from a common pin of the loop inductor, the feedback resistor and a crystal; then the parameter values of the feedback resistor, the first load capacitor and the second load capacitor are changed, the simulation process is started again, and a loop gain curve is obtained from the common pin of the loop inductor, the feedback resistor and the crystal; the process is repeated, and therefore whether the crystal oscillator circuit starts oscillation or not under each group of parameter values is detected fast. By means of the method for detecting whether the crystal oscillator circuit starts oscillation or not, whether the crystal oscillator circuit starts oscillation or not can be fast and effectively detected, the whole simulation time is short, few hardware resources are occupied, and the simulation result is reasonable.

Description

technical field [0001] The invention relates to the technical field of crystal oscillators, in particular to a method and circuit structure for quickly and effectively detecting whether a crystal oscillator circuit starts to oscillate. Background technique [0002] Since the first foreign quartz crystal oscillator came out in the early 1920s, the technology of quartz crystal oscillators has become increasingly mature. Because the Q value of the crystal oscillator is very large, the crystal oscillator naturally has high frequency stability and excellent phase noise performance, so it is widely used. As a high-precision and high-stability oscillator, crystal oscillators are widely used in various oscillating circuits such as color TVs, computers, and remote controls, as well as in communication systems for frequency generators, generating clock signals for data processing equipment, and for Certain systems provide a reference signal. [0003] Today, almost all digital circui...

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method and circuit structure for detecting whether the crystal oscillator circuit is oscillating, which is used to solve the simulation method for detecting whether the crystal oscillator circuit is oscillating in the prior art. The problem of waiting too long

Images