System and method for adjusting multi-level power supply voltage of power amplifier based on transmitter branch gain setting

Abstract

The invention discloses a system and method for adjusting multi-level power supply voltage of a power amplifier based on transmitter branch gain setting. The system comprises a radio frequency transceiver, a step-up / step-down DC-DC converter, a radio frequency predistorter and a power amplifier, wherein the radio frequency transceiver sends an analog voltage signal to the step-up / step-down DC-DC converter so as to control the step-up / step-down DC-DC converter to output a corresponding power supply voltage value to the power amplifier; the radio frequency transceiver sends a radio frequency excitation signal to the radio frequency predistorter; a processed radio frequency pre-distortion signal is sent to the input end of the power amplifier by the radio frequency pre-distorter; the power amplifier amplifies a received radio frequency pre-distortion signal, one part of a generated radio frequency amplification signal is sent to an antenna through a duplexer to be transmitted, and the other small part of the generated radio frequency amplification signal is fed back to the radio frequency pr-distorter through a coupler and also fed back to the input end of the radio frequency transceiver at the same time.

Description

technical field [0001] The invention belongs to the field of radio communication, and in particular relates to a system and method for adjusting multi-level power supply voltage of a power amplifier based on transmitter branch gain setting. Background technique [0002] Usually the power amplifier is used as a wireless transmitter system or device terminal unit. When the power amplifier amplifies the radio frequency signal, no matter whether the average power of the output radio frequency signal after amplification is strong or weak, the power supply voltage of the amplifier is constant. When the power of the RF signal amplified by the power amplifier is weak, the power supply voltage of the amplifier remains constant, so the DC power consumption of the power amplifier is also relatively large, resulting in a decrease in power efficiency. One of the effective ways to improve power efficiency is to dynamically adjust the power supply voltage of the amplifier according to the ...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this technology is that due to the limitation of the transmission bandwidth of the power modulator, the envelope change of the output RF signal of the power modulator will cause serious nonlinear distortion of the power amplifier, which will lead to a decrease in the performance of the transmitted signal.

However, the disadvantage of this technology is that it is necessary to measure or estimate the average power of the radio frequency signal in the next period of time, but it is difficult to measure or estimate the signal power in this period in real time, and adjust the power of the power amplifier according to the measured or estimated signal power. power supply voltage without delaying and affecting the RF signal transmission

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