Radio-frequency calibration method and device of mobile terminal

Abstract

The present invention provides a radio frequency calibration method for a mobile terminal, including: setting a parameter required for radio frequency calibration of the mobile terminal (201); obtaining P PDM values of power control signals and actual output power (P) values of the mobile terminal corresponding to the P PDM values by using different scanning steps according to linearity of a power curve, or, selecting, by using different selection intervals, part of P PDM values and P value corresponding to the part of P PDM values from calibration data obtained by fine scanning (202); and converting the obtained P values into P AGC values recognizable by the mobile terminal, and storing the P AGC values and the P PDM values corresponding to the P AGC values into a memory of the mobile terminal (203). The present invention further discloses a radio frequency calibration apparatus for a mobile terminal. Through the solution of the present invention, the finally obtained calibration data are more approximate to the memory space of the mobile terminal in length, so that the mobile terminal can transmit correct power by querying the calibration data when transmitting power to the outside, thereby reflecting the output characteristics of the mobile terminal more truly and improving the radio frequency output index, such as inner-loop power control, of the mobile terminal.

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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