Journal of Guangxi Normal University(Natural Science Edition) ›› 2013, Vol. 31 ›› Issue (3): 17-22.

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Adaptive Feed-forward and Pre-distortion Power Amplifier

LIU Di-di, SONG Shu-xiang, ZENG Fan-feng, JIANG Yan-yan   

  1. College of Electronic Engineering,Guangxi Normal University,Guilin Guangxi 541004,China
  • Received:2013-06-05 Online:2013-09-20 Published:2018-11-26

Abstract: Two linearization methods,feed-forward and pre-distortion are combined in this paper,namely two pre-distortion units are added to the feed-forward linearization system.Based on the analysis of feed-forward and pre-distortion amplifier,the proposed amplifier requires quick balance of amplitude and phase of signals between different branches.In order to make the amplitude and phase quickly reach balance,adaptive control parameter network is introduced to regulate circuit parameter automatically.In this paper the principle diagram of adaptive feed-forward and pre-distortion linear power amplifier is presented,the solution of the circuit parameters when the linear amplifier work in optimum is derived by simplifying the model of it,and also the realization method of the parameters in the DSP is given.Finally,the system is simulated under ADS.Result shows that the inhibition of IMD3 of the system adding two pre-distortion units can be increased about 20 dBc than that with only feed-forward amplifier.

Key words: power amplifier, feed-forward, pre-distortion, linearization, adaptive

CLC Number: 

  • TN702
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