Feed-forward power amplification circuit and method for realizing power amplification by using same

Abstract

The invention is suitably applied to the field of communication, and provides a feed-forward power amplification circuit and a method for realizing power amplification by using same. The feed-forwardpower amplification circuit comprises a 3dB electric bridge, a first vector modulator, a second delay line, a second coupler, a second vector modulator and an error power amplifier, wherein the firstvector modulator is connected with the 3dB electric bridge; and the second delay line, the second coupler, the second vector modulator and the error power amplifier are sequentially connected with the3dB electric bridge. The feed-forward power amplification circuit further comprises a Doherty power amplifier, a first coupler, a first delay line and a third coupler, wherein the Doherty power amplifier is connected with the first vector modulator and used for carrying amplifying power on radio frequency signals; and the first coupler, the first delay line and the third coupler are sequentiallyconnected with the Doherty power amplifier. The error power amplifier is connected with the input end of the third coupler, and the output end of the first coupler is connected with the input end of the second coupler. The feed-forward power amplification circuit can keep higher power amplification efficiency and linearity, and improve the efficiency of the feed-forward power amplification by over20%.

Description

technical field [0001] The invention belongs to the communication field, and in particular relates to a feedforward power amplifier circuit and a method for realizing power amplification by using it. Background technique [0002] The rapid increase of today's cellular and personal communication networks has made the already crowded spectrum more burdensome, especially the proposal of the third generation wireless mobile communication system, the frequency band is widened, the linearity requirement is high, the dynamic range is enlarged, and the power output is increased. The frequency bandwidth, linearity and efficiency of the power amplifier all put forward higher requirements. [0003] In the traditional power amplifier circuit design, high-power devices are used, combined with power back-off to meet the linearity requirements of the system. This method reduces the efficiency of the system. On the other hand, when a higher transmission power is required, it is often unabl...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a feedforward power amplifier circuit, which aims to solve the problem of low power amplifier efficiency of the feedforward power amplifier circuit provided by the prior art

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