Method and system for frequency calibration of radio frequency signal

Abstract

The invention discloses a method system for frequency calibration of a radio frequency signal. The method comprises the following steps that: a to-be-calibrated electronic radio frequency device is controlled to emit a radio frequency signal from a main board by using a preset digital-to-analog conversion (DAC) parameter; the radio frequency signal enters a feed point of an antenna and is converted into a wireless radio frequency signal for radiation to space; a coupling antenna device receives the wireless radio frequency signal and the signal is converted into an induced current signal; according to the frequency of the induced current signal and the preset DAC parameter, an emission frequency control parameter is calculated; the emission frequency control parameter is written into a storage unit of the to-be-calibrated electronic radio frequency device so as to adjust a crystal oscillation circuit, so that the frequency of the radio frequency signal is within a preset frequency range. According to the invention, because the wireless radio frequency signal is used for realizing radiation from the antenna to the space and radio frequency signal transmission is realized by using the antenna coupling mode, radio frequency signal emission calibration can be realized rapidly in the integrated machine state, so that the radio frequency transmission wire utilization can be avoided and thus steps of machine dismounting and installation due to the radio frequency transmission wire utilization can be saved.

Description

technical field [0001] The invention relates to the field of electronic equipment testing, in particular to a frequency calibration method and system for radio frequency signals. Background technique [0002] For the radio frequency signal emitted by electronic radio frequency equipment, the crystal oscillation frequency inside the electronic radio frequency equipment determines the frequency of the radio frequency signal. The frequency control of the radio frequency signal can be realized by adjusting the internal crystal shock circuit of the electronic radio frequency equipment. When there is an excessive difference between the frequency of the transmitted radio frequency signal and the required frequency, the electronic radio frequency equipment will not work normally. Taking the mobile terminal as an example, when the frequency difference between the radio frequency signal transmitted by the mobile terminal and the network frequency is too large, the radio frequency sig...

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Problems solved by technology

However, this method requires dismantling and re-installation of the electronic radio frequency equipment to be calibrated

In addition, in the process of disassembly and assembly, it may also cause scrapping of materials, and even affect the quality of products.

At the same time, it also leads to a lot of time consumption

In particular, if an error occurs due to a sudden problem of the radio frequency comprehensive testing instrument in the production line during the circuit board processing stage, it will cause a large deviation in the emission frequency of all electronic radio frequency equipment calibrated by the instrument within a certain period of time , it is extremely complicated and time-consuming to carry out the above-mentioned disassembly, measurement and calibration, and reinstallation of each electronic radio frequency device separately.

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