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Frequency detection device

A technology of frequency detection and frequency division, which is applied in the field of integrated circuits, can solve problems such as long time, and achieve the effects of reducing power consumption, saving detection time, and saving costs

Active Publication Date: 2014-10-29
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using a digital frequency detector to detect the frequency of a periodic signal is relatively simple, but it takes a long time to complete the detection, and the detection time is several times the period of the reference clock

Method used

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Embodiment Construction

[0048] The technical solution of the present invention provides a frequency detection device, which is suitable for detecting whether the frequency of a periodic square wave signal is within a predetermined frequency range. figure 1 It is a schematic structural diagram of a frequency detection device provided by an embodiment of the present invention. The frequency detection device includes a divide-by-two circuit 11, a delay circuit 12, a charging and discharging circuit 13, a comparison circuit 14, and a latch circuit 15.

[0049] Specifically, the frequency-dividing circuit 11 is adapted to perform frequency-dividing processing on the periodic signal Fin to be detected to generate a frequency-divided signal Fdi. As the signal to be tested, the periodic signal Fin to be detected is a square wave signal with a fixed frequency, and its duty cycle is random. After the two frequency division processing, the frequency of the frequency division signal Fdi is one-half of the frequency ...

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Abstract

A frequency detection device comprises a frequency halving circuit used for conducting frequency halving processing on a periodical signal to be detected to generate a frequency halving signal, a delaying circuit used for conducting delaying on the frequency halving signal to generate a delaying signal, a charging and discharging circuit used for conducting charging or discharging on the output end of the charging and discharging circuit when the delaying signal is first level and resetting the output end of the charging and discharging circuit when the delaying signal is second level and the frequency halving signal is the first level, a comparison circuit used for comparing first reference voltage and the output voltage of the charging and discharging circuit to generate a first comparison signal and comparing second reference voltage and the output voltage of the charging and discharging circuit to generate a second comparison signal when the delaying signal is the second level and an RS latch used for conducting latch processing on the first comparison signal and the second comparison signal. The frequency detection device saves detection time.

Description

Technical field [0001] The present invention relates to the field of integrated circuit technology, in particular to a frequency detection device. Background technique [0002] For most digital circuits and digital-analog hybrid circuits, it is often necessary to provide one or more periodic signals with a certain frequency from outside. The frequency of the periodic signal affects the working state of the entire circuit, too low or too high frequency may cause the entire circuit to fail to work normally. In order to ensure the reliable operation of the entire circuit, it is usually necessary to detect the frequency of the periodic signal to determine whether the frequency of the periodic signal is within a predetermined frequency range. [0003] In the prior art, a digital frequency detector is usually used to detect the frequency of a periodic signal. When a digital frequency detector is used to detect the frequency of a periodic signal, the periodic signal to be detected is co...

Claims

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Application Information

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IPC IPC(8): G01R23/15
Inventor 陈丹凤曹云
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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