Automatic control method for improving efficiency of radio frequency power amplifier

Abstract

The invention discloses an automatic control method for improving the efficiency of a radio frequency power amplifier. The real-time adjustment of a static operating point of the radio frequency poweramplifier is achieved through the automatic control of a gate-source voltage Vgs of the radio frequency power amplifier, and mixing and low-pass filtering are performed on an input signal and an output signal of the radio frequency power amplifier after performing coupling on the same to obtain a DC signal; an analog-to-digital converter in a single-chip microcontroller collects the voltage information of the DC signal in real time and compares the voltage information with a known ideal value, and the compared difference is provided for the analog-to-digital converter in the single-chip microcontroller for outputting a matched voltage, an output end of the analog-to-digital converter is connected with an inductor L1 and is connected to the grid of the radio frequency power amplifier so asto adjust the gate-source voltage Vgs of the radio frequency power amplifier in real time. By adoption of the automatic control method, the effective balance between additional efficiency and error vector magnitude is achieved. In other words, the additional efficiency is maximized while the output error vector magnitude is guaranteed, and the circuit configuration is extremely streamlined, so that the automatic control method is suitable for wide range application.

Description

technical field [0001] The invention relates to the technical field of radio frequency power amplifiers, in particular to an automatic control method for improving the efficiency of radio frequency power amplifiers. Background technique [0002] In wireless communication or radar systems, the energy consumption of radio frequency power amplifiers has always accounted for a high proportion, and the efficiency is low. For example, the energy consumption of the radio frequency power amplifier in the mobile phone accounts for as high as 50% of the whole machine, which becomes the bottleneck of the length of the talk time. The peak-to-average ratio caused by high-order, multi-carrier and large-bandwidth modulation signals also leads to low additional efficiency of the power amplifier. For example, the additional efficiency of the power amplifier working under the condition of 10dB peak-to-average ratio is only about 10% after linear regression. [0003] In order to improve the a...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of high energy consumption and low efficiency of radio frequency power amplifiers, in order to overcome the deficien

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