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Clock signal detection method and system

A technology of clock signal and detection accuracy, which is applied in the field of clock signal detection method and system, can solve problems such as high resource consumption, long detection time, and oscillation frequency point jump, so as to save circuit resources, reduce consumption time, and simplify design effect of difficulty

Active Publication Date: 2011-07-27
SHANGHAI HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] 2. The overtone crystal oscillator will have a failure mode where the oscillation frequency jumps. The overtone refers to the mechanical harmonic of the crystal vibration
[0013] According to the above method to detect the clock signal, if the detection accuracy is doubled, such as figure 2 As shown, the D flip-flops used by the frequency division counter and the detection result counter need to be increased by one each, and the detection time will also be doubled, that is, the consumed resources are proportional to the detection accuracy, and the detection time is exponentially related to the detection accuracy.
The higher the accuracy requirement, the more resource consumption, and the longer the detection time

Method used

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  • Clock signal detection method and system
  • Clock signal detection method and system

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Embodiment Construction

[0035] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and implementations.

[0036] The digital clock signal is a square wave with a fixed period and a typical duty cycle of 50%. Through the Fourier transform, the frequency spectrum of the digital clock signal can be described as the following formula:

[0037] v ( t ) = V S 2 + 2 V S p ( sin w 0 t + 1 3 sin 3 w 0 ...

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Abstract

The invention discloses clock signal detection method and system, belonging to the technical field of signal detection. The method comprises the following steps of: inputting a clock signal to a band-pass filter, wherein the bandwidth of the band-pass filter corresponds to the detection accuracy required by the clock signal; reshaping the output of the band-pass filter; and detecting whether a signal is output after reshaping, and if no signal is detected to be output, determining the clock signal to be faulty. By using the clock signal detection method and system, the coupling relationship between the clock signal detection accuracy and consumed resources as well as detection time can be eliminated, the detection of the clock signal can be simply and conveniently realized, the detection time is shortened, and the requirements for different detection accuracies are satisfied.

Description

technical field [0001] The invention relates to the technical field of signal detection, in particular to a clock signal detection method and system. Background technique [0002] The reference signal of the digital circuit system is the clock signal, and the accuracy and stability of the clock signal determine the reliability of the digital circuit system function. [0003] At present, most of the clock sources commonly used in the industry are provided by crystal oscillators, because the quality factor of crystal circuit characteristics, that is, the Q value is very high, and can provide high-accuracy and high-stability clocks for digital circuit systems. However, due to physical structure characteristics and technical level limitations, crystal oscillators will have two failure modes: [0004] 1. Fundamental frequency crystal oscillator, the fundamental frequency refers to the vibration frequency of the lowest order in the vibration mode. Due to the physical aging of the...

Claims

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Application Information

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IPC IPC(8): H03K5/19
Inventor 雷波
Owner SHANGHAI HUAWEI TECH CO LTD
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