Radio-frequency calibration method and device of mobile terminal

Abstract

The invention discloses a radio-frequency calibration method and a radio-frequency calibration device of a mobile terminal. The method comprises the following steps of: setting parameters required by radio frequency calibration of the mobile terminal; acquiring the value PPDM of a power control signal and the practical output power (P) value of a terminal corresponding to the power control signal by adopting different scanning step lengths according to the linearity of a power curve; or selecting partial PPDM value and a P value corresponding to the PPDM value by adopting different selection intervals in the calibration data acquired by fine scanning; and converting the acquired P value into a value PAGC which can be identified by the terminal and storing the PAGC value and the PPDM value corresponding to the PAGC value in a terminal memory. The scheme of the invention can make the finally acquired calibration data fully use the memory space of the mobile terminal, more truly reflects the output characteristics of the mobile terminal and improves radio-frequency emission indexes.

Description

technical field [0001] The invention relates to the field of radio frequency calibration of mobile terminals, in particular to a method and device for radio frequency calibration of mobile terminals. Background technique [0002] Generally, mobile terminals must undergo radio frequency calibration before leaving the factory, including radio frequency transmitter calibration. In the prior art, the radio frequency transmitter is located in the mobile terminal. When using the transmitter to calibrate, the calibration program in the PC sends a power control to the transmitter in the mobile terminal through a serial port such as a Universal Serial Bus (USB, Universal Serial BUS). signal, which can be denoted as P PDM value to control the power of the radio frequency signal emitted by the transmitter; the radio frequency signal sent by the transmitter is transmitted to the comprehensive tester through the radio frequency coaxial line, and the calibration program controls the comp...

AI Technical Summary

Problems solved by technology

[0017] The second case: L>L', at this time, the power range of the linearization table written in the terminal memory cannot cover the dynamic range of the terminal's normal working output power, thus affecting the terminal's emission index

[0018] The third case: LPDM The scanning is not fine, and the terminal memory space is not used up. If the linearity of the PA or the linearity of the radio frequency transmission of the terminal is very good, this situation will not affect the terminal’s emission indicators, but if the linearity is not good, it will affect the terminal. The emission index of

[0020] However, in practical applications, through a large number of projects and experiments, it is found that: due to the P of each segment PDM The scan step is constant, so no matter how you debug the Step, the final result will either turn the second case into the third case, or the third case into the second case, and it is almost impossible to achieve the first case ideal situation

However, in the third case, on the one hand, due to the unsatisfactory linearity of the PA or the linearity of the radio frequency transmission of the terminal, the calibration scan is not fine, which affects the terminal's transmission indicators, especially the inner loop power control indicators. ; On the other hand, since the length of L is only about 2 / 3 or 3 / 4 of L' in practical applications, the memory space of the linearization table is wasted

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