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Frequency synthesizer and frequency-locked loop

A frequency-locked loop and frequency comparator technology, applied in the field of frequency synthesizer and frequency-locked loop compensation, can solve the problems of crystal oscillator frequency drift, no very effective solution, drift, etc., to achieve the effect of reducing the impact

Active Publication Date: 2011-05-25
山东建荣教学设备有限公司
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Problems solved by technology

However, the crystal oscillator will also produce frequency drift with aging. For example, in the early stage of an electronic device, the output frequency of the crystal oscillator in it will be very accurate after the above-mentioned temperature frequency correction, but when the electronic device is used After 1 or 2 years, the frequency of the crystal oscillator output will still drift after temperature frequency correction
[0006] At present, there is no very effective and suitable solution for the frequency drift of the crystal oscillator due to aging.

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  • Frequency synthesizer and frequency-locked loop
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Embodiment Construction

[0028] The detailed description of the present invention directly or indirectly simulates the operation of the technical solution of the present invention mainly through programs, steps, logic blocks, processes or other symbolic descriptions. In the ensuing description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. Rather, the invention may be practiced without these specific details. These descriptions and representations herein are used by those skilled in the art to effectively convey the substance of their work to others skilled in the art. In other words, for the purpose of avoiding obscuring the present invention, well-known methods, procedures, components and circuits have not been described in detail since they are readily understood.

[0029] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementa...

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Abstract

The invention discloses a frequency-locked loop comprising a digital loop filter, a data collection unit, a comparison unit, an aging correction word generation unit and a correcting unit. The data collection unit collects digital data output by the digital loop filter, carries out the weight processing on the digital data to obtain a weight value, and provides the weight value as a current weight value to the comparison unit; and the comparison unit compares the current weight value with a standard weight value and provides a comparison result to the aging correction word generation unit which regulates a current aging correction word according to the comparison result to generate the latest aging correction word. When an aging frequency drift occurs in a crystal oscillator, the influence to the output frequency can be eliminated or decreased through the drift compensation of an aging compensation feedback loop.

Description

【Technical field】 [0001] The invention relates to the field of electronic circuit design, in particular to the compensation technology of a frequency synthesizer and a frequency-locked loop. 【Background technique】 [0002] The output frequency of the crystal oscillator will drift with the change of temperature, so the various frequencies generated based on the output frequency of the crystal oscillator will drift accordingly. In order to solve this technical problem, the application number is 200810037670.5, and the publication date is On September 24, 2008, a Chinese patent application with publication number CN101272142A disclosed a frequency synthesizer with temperature frequency compensation. figure 1 A structural block diagram of the frequency synthesizer in this patent application is shown. [0003] Such as figure 1 As shown, the frequency synthesizer 100 includes an oscillation circuit 101 , a frequency locked loop 107 , a frequency correction unit 109 , a digital t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L1/00H03L7/085
Inventor 曹伟勋
Owner 山东建荣教学设备有限公司
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