Improved method and improved device for frequency correction
A frequency correction and reference frequency technology, applied in the direction of output stability, electrical components, etc., can solve the problems that the frequency accuracy cannot meet the requirements, and the crystal oscillator cannot achieve it.
Inactive Publication Date: 2013-06-05
RFDOT MICROELECTRONICS
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Problems solved by technology
In high-precision applications such as global positioning systems, such frequency accuracy cannot meet the requirements; or in applications, the annual error of chips or devices is usually required to be within 5 minutes, which must be within 10ppm. The crystal oscillator or frequency divider may not be able to achieve this accuracy
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[0022] 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 and procedures have not been described in detail since they have been readily understood.
[0023] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the pres...
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The invention provides a method and a device for frequency correction. The method for frequency correction includes determining frequency dividing ratio according to frequency of a target frequency signal and expectation frequency of a reference frequency signal, determining correction value and correction remainder of the frequency dividing ratio according to the actual frequency of the reference frequency signal and the frequency discursion of the expectation frequency, utilizing the correction value to correct the frequency dividing ratio to obtain a corrected frequency dividing ratio, determining a remainder compensation value based on the correction remainder and period of the preset adjusting frequency signal, conducting frequency dividing on actual frequency of the reference frequency signal according to the corrected frequency dividing ratio and utilizing the remainder compensation value and the preset adjusting frequency signal to compensate the frequency dividing to obtain a target frequency signal. Therefore, the accurate target frequency signal can be obtained.
Description
【Technical field】 [0001] The invention relates to the field of clock design, in particular to a frequency correction method and device. 【Background technique】 [0002] In clock chip design, the accuracy of the clock frequency depends on the frequency accuracy of the quartz crystal used. In order to ensure that all electronic devices can work properly or synchronously, it is very important to provide an accurate clock signal in electronic circuit design. The clock signal can generally be generated by a crystal oscillator, wherein the crystal oscillator is an electronic circuit that utilizes the mechanical resonance of an oscillating crystal of piezoelectric material to generate an electrical signal of a certain frequency. This frequency is often used for timekeeping, it can also be used to provide a clock signal for digital integrated circuits, and it can also be used to stabilize the frequency of a wireless transmitter / receiver. One cause of a clock signal that differs fro...
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Inventor 冯向光顾奇龙饶芳敏
Owner RFDOT MICROELECTRONICS