An automatic frequency calibration system, calibration method, and mobile terminal
A technology of automatic frequency calibration and output frequency, applied in the direction of automatic frequency control parts, transmission systems, electrical characteristic frequency control, etc., to achieve the effect of reducing calibration cost, simplifying calibration process and simple structure
Active Publication Date: 2018-03-30
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology
The above technical solution mainly involves how to maintain a stable call frequency, which is applicable to the use of mobile phones, not the frequency calibration process of mobile phones, so it cannot solve the problems existing in the prior art
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[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0045] It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other if there is no conflict.
[0046] The present invention will be further described below with reference to the drawings and specific embodiments, but it is not a limitation of the present invention.
[0047] In the prior art, as a passive passive device, the crystal oscillator device (Crystal) in the mobi...
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The invention discloses an automatic frequency calibration system and method, and a mobile terminal, and belongs to the technical field of wireless receiving. The system comprises an adjustment unit; a detection unit; a first storage unit which is connected with the detection unit and the adjustment unit; a processing unit which is connected with the first storage unit; and a second storage unit. The method comprises the steps: generating initial adjustment values; adjusting a capacitance value according to the adjustment value; detecting whether an external network can be accessed or not at each adjustment value; calculating and forming a standard adjustment value according to the corresponding adjustment value when the external network can be accessed, and storing the standard adjustment value. The beneficial effects of the technical scheme of the invention are that a process of automatic frequency calibration is simplified; the system and method can conveniently solve a problem that the frequency offset of the mobile terminal is too large; the implementation is easy; the cost is lower; and the calibration efficiency is improved.
Description
Technical field [0001] The present invention relates to the field of wireless receiving technology, in particular to an automatic frequency calibration system, a calibration method and a mobile terminal. Background technique [0002] Mobile terminals, especially mobile phones, go through many testing and calibration links in the production process, which can ensure that the mobile terminal is in the best condition and meet the requirements of various communication protocols and other aspects. [0003] In the prior art, in a series of tests on mobile terminals, the most important thing is automatic frequency control (AFC). The so-called automatic frequency calibration refers to an automatic control method that maintains a certain relationship between the output signal frequency and a given frequency. In short, it synchronizes the working frequency of the mobile terminal with the external network, so as to achieve a communication connection with the external network. Because the exi...
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IPC IPC(8): H04B1/10H03D7/16H03J7/06
Inventor 刘入忠施武林
Owner SPREADTRUM COMM (SHANGHAI) CO LTD