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Feed-forward power amplifier on basis of pre-distortion and Doherty

A power amplifier and predistortion technology, applied in power amplifiers, improving amplifiers to improve efficiency, etc., can solve problems such as low efficiency, and achieve the effect of improving efficiency, improving environmental adaptability, and simplifying adaptive design

Active Publication Date: 2012-10-03
WUHAN HONGXIN TELECOMM TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the invention is to solve the problem of low efficiency of traditional feed-forward technology

Method used

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  • Feed-forward power amplifier on basis of pre-distortion and Doherty
  • Feed-forward power amplifier on basis of pre-distortion and Doherty
  • Feed-forward power amplifier on basis of pre-distortion and Doherty

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Embodiment Construction

[0021] like Figure 4 , the feedforward power amplifier of the embodiment of the present invention specifically includes: a first coupler 1, a predistortion module 2, a main amplifier 3, a second coupler 4, a first delayer 5, a third coupler 6, a second delayer Timer 7, combiner 8, error amplifier 9.

[0022] The input signal enters the first coupler 1 and is divided into two paths, one path is the through signal of the input signal, and the other path is the coupled signal of the input signal,

[0023] The direct signal of the input signal is input to the pre-distortion module 2, the output of the pre-distortion module 2 is connected to the input of the main amplifier 3, the main amplifier 3 outputs the amplified radio frequency signal, and the amplified radio frequency signal is connected to the second coupler and divided into two channels, one channel It is the through signal of the amplified radio frequency signal, and one road is the coupled signal of the amplified radio...

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Abstract

The invention relates to a feed-forward power amplifier on the basis of pre-distortion and a Doherty, which is provided with a first coupler, a pre-distortion module, a main amplifier, a second coupler, a first time delayer, a third coupler, a second time delayer, a combiner and an error amplifier. The main amplifier comprises three or more stages of power amplification tubes; the final stage of power amplification tube at least comprises a double-path or multipath Doherty; an input signal enters the first coupler and is divided into two paths, a through signal fo the input signal is input into the pre-distortion module, an output of the pre-distortion module is connected with an input of the main amplifier, an amplified radio frequency signal output by the main amplifier is connected into the second coupler, a through signal of the amplified radio frequency signal is input into the first time delayer, a coupling signal of the amplified radio frequency signal is input into the combiner, a coupling signal of an input signal is input into the second time delayer and an output of the second time delayer is connected into the combiner; and an output of the combiner is connected into the error amplifier, an output of the error amplifier and an output of the first time delayer are respectively connected into the third coupler and a signal is output by the third coupler.

Description

technical field [0001] The invention relates to the design field of power amplifiers in mobile communication systems, in particular to feedforward power amplifiers. Background technique [0002] In recent years, with the large-scale expansion of 3G networks, the demand for multi-carrier base station amplifiers is also increasing. Its core multi-carrier base station amplifier power amplifier has high output power and high linearity requirements. On the one hand, the nonlinearity of the power amplifier has a huge impact on the entire system; on the other hand, it advocates low-carbon and energy-saving. Therefore, linearity and efficiency are increasingly becoming the focus of operators. How to improve the efficiency of equipment under the requirement of ensuring linearity has become a difficult point for major equipment manufacturers to overcome. At present, the most widely used linearization technologies are pre-distortion technology and feed-forward technology. Feedback ...

Claims

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Application Information

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IPC IPC(8): H03F1/07H03F3/20
Inventor 刘金峰陈东进陈俊涛吴亮宇周玉栋张奎
Owner WUHAN HONGXIN TELECOMM TECH CO LTD
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