System and method for calibrating terminal APC (Automatic Power Control) automatic production
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An automatic production and terminal technology, applied in the transmission system, transmission monitoring, electrical components, etc., can solve the problems of long time and low production efficiency
Active Publication Date: 2011-04-06
LEADCORE TECH
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Problems solved by technology
In addition, even if the above-mentioned improved APC calibration method is adopted, it still takes quite a long time to calibrate an APC code table, and the production efficiency is still very low
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Embodiment 1
[0066] Embodiment 1 of the present invention provides a method for terminal 15 to perform APC automatic production calibration, such as figure 1 and figure 2 As shown, the method steps include:
[0067] Step 1: Calibrate the measurement error of the power detection module 24
[0068] A: The terminal 15 enters the production test mode under the control of the PC 11.
[0069] B: The baseband 21 of the terminal 15 first controls the transmission power of the transmitter 23 with the APC control code corresponding to the maximum transmission power level according to the APC code table 22, and the transmitter 23 sends the pseudo-random waveform file according to the transmission power.
[0070] C: The power detection module 24 detects the power value transmitted to the antenna 27 through the power coupler 26 , and returns the measured power value to the baseband 21 .
[0071] D: The spectrum analyzer 13 reads the power value transmitted to the antenna 27 through the power couple...
Embodiment 2
[0090] Embodiment 2 of the present invention also provides a method for terminal 15 to perform APC automatic production calibration, the method includes the following steps:
[0091] Step 1: Calibrate the measurement error of the power detection module. The calibration method is consistent with the method for calibrating the measurement error of the power detection module in Embodiment 1, and will not be repeated here.
[0092] Step 2: APC Automatic Production Calibration
[0093] Turn on the terminal 15 to enter the APC automatic production calibration mode.
[0094]1, baseband 21 every frame sends a plurality of time slots, assuming that every frame sends the maximum number of time slots to be N, one calibration can complete the calibration of N power levels; The APC control code controls the transmission power of the transmitter 23 to send the pseudo-random waveform file, and the second transmission time slot is reduced by one power level, and the APC control code correspo...
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Abstract
The invention provides a system and a method for calibrating terminal APC (Automatic Power Control) automatic production, relating to a radio frequency circuit of a terminal in the radio communication field, and being capable of effectively improving the efficiency of APC calibration in the process of terminal production. The system for calibrating terminal APC automatic production comprises a base band, an APC code list, a transmitter, a radio frequency front end circuit module, a power coupler and an antenna. The APC code list saves APC control codes corresponding to different power grades. The base band calls the APC code list and controls the transmitter to transmit powers according to the APC code list. The system further comprises a power detection module connected between the power coupler and the base band, the power detection module is used for detecting a power value transmitted to the antenna by the power coupler and feedbacks the detected power value to the base band, and the base band regulates the APC control code corresponding to the present power grade in the APC code list according to the feedback detection power value so that the error between the detected power value and the power value corresponding to the power grade achieves the design requirement. The invention further provides the method for calibrating terminal APC automatic production.
Description
technical field [0001] The invention relates to a terminal radio frequency circuit in the field of wireless communication, in particular to a system and method for automatic production and calibration of a terminal APC (Automatic Power Control, automatic power control). Background technique [0002] There are a large number of analog devices in the RF circuit of the mobile terminal, and the analog devices have a large device discreteness, which will lead to the discreteness of the RF characteristics of different terminals produced, that is, the RF performance of the terminal such as maximum transmit power, closed-loop power control, etc. If the index cannot meet the index requirements of 3GPP, it cannot pass the radio frequency conformance test, and may even affect the protocol conformance test. Therefore, in the production process of mobile terminals, radio frequency calibration must be performed on each produced terminal to eliminate this discrete characteristic, so that e...
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