Temperature compensation method and device for linear power amplifier

Abstract

The invention relates to the technical field of electronic communication and especially relates to a temperature compensation method for a linear power amplifier. The method comprises: detecting the maximum transmitting power of each frequency point in a whole frequency band under a setting temperature and obtaining a transmitting power curve of the frequency band; determining offset values of maximum transmitting powers and target powers, wherein the maximum transmitting powers are corresponding to frequency points of a first type which indicate a change trend of the transmitting power curve in the frequency band; if a current transmitting frequency point is a frequency point of the first type, performing output power compensation to an RF transmitter chip on the basis of an offset value corresponding to the current transmitting frequency point and quitting; if a current transmitting frequency point is a frequency point between the frequency points of the first type, obtaining offset values corresponding to frequency points using linear interpolation, wherein the frequency points are between the adjacent frequency points of the first type; performing output power compensation to the RF transmitter chip on the basis of an offset value corresponding to the current transmitting frequency point and quitting. By use of the method, the number of channels needed in temperature compensation is reduced, and the transmitting power evenness of a cell phone in a whole frequency band is maintained.

Description

technical field [0001] The invention relates to the technical field of electronic communication, in particular to a temperature compensation method of a linear power amplifier. Background technique [0002] The third-generation mobile communication technology represented by WCDMA (Wideband Code Division Multiple Access, wideband code division multiple access), in order to realize wideband modulation, multi-carrier application, and reduce adjacent channel interference to meet the bit error rate requirements of the communication system, base station emitter The linear index of the power amplifier is strictly required. Generally, WCDMA mobile phones use a linear power amplifier (PA, Power Amplifier). Since the output power of the linear power amplifier is different under different ambient temperatures, the gain will change with the change of the ambient temperature, and the transmit power will change with the temperature. It rises and falls, and vice versa; if there is no tempe...

AI Technical Summary

Problems solved by technology

The main disadvantage of the existing technology is that the flatness of the power in the entire frequency band cannot be guaranteed. It is possible that only the compensation values ​​of the sampled channels are closest to the actual situation, while the compensation values ​​of other channels always have certain errors.

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